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H: Question about fingering
I have designed a circuit in Cadence Virtuoso. As a first step, I used all the transistors without fingers (i.e. each transistor is a single transistor).
Once the circuit satisfied all the requirements I wanted (dc gain, location of the poles, slew rate and so on) I decided to use fingers f... |
H: AD823 current sense
Refer the attached schematics.
Consider the details mentioned in it. I want to build the current sensing scheme using the part AD823 . enter link description here
I understand that offset correction could be done in the controlled interfaced to the ADC. But i want to understand from circuit pers... |
H: PMSM Rotor Design. Are these terms equivalent?
I'm working on a project with a PMSM. As I go through the literature I come across the following terms and wanted to make sure that I am getting right which ones are synonyms.
Surface-mounted PM = Non-salient pole rotor = Round Rotor = Cylindrical (in this case Induc... |
H: Instantiating module inside for loop
I'm trying to write Verilog code for converting any digit decimal number to a BCD number.
My logic: when I read decimal number, I'll extract the decimal number digit by digit, and I have written a module to convert the decimal digit (0 to 9) to BCD.
But, I'm getting an error in ... |
H: Power devices max voltage, current, power, speed, etc. .. ratings
I want to know how to get the real world or the most recent or the reliable information about power devices max ratings in volt, ampere, power, speed .. etc., parameters.
I found this picture that is seem to be reasonable, but I'm also interested if ... |
H: Sensitivity analysis question
I am trying to figure out how to calculate the sensitivity of a circuit, especially the sensitivity of a damping ratio (how much the damping ratio changes as each component value varies).
Expression for zeta is quite long and complicated, so I prefer not to take partial derivative. I... |
H: Matlab code to determine and plot impulse response
I have a signal y[n], represented by the vector y in this form
y[n] =x[n] + ax[n−N]
About this signal:
x[n] is the uncorrupted speech signal which has been delayed by N samples and added back in with its amplitude decreased by a<1
N= 1000, and the echo amplitude... |
H: When making power polygon , making polygon on the smd-pad has any problems?
I'm now making 4 layer PCB
and my PCB has one Power plane (L3) and one GND plane (L2).
Now I just make a connection with inner layer (L3) with Top plane(L1).
At this point, I'm curious that what is the best connection for supplying power.
... |
H: How can I float a pin that otherwise should be low?
I want to enable/disable a TI TPS54302 buck regulator with a microcontroller. The enable (EN) pin should float to enable the device, or be tied low to disable it.
I currently have the EN pin connected to a GPIO pin on the MCU. At startup, before the pin state can ... |
H: Is a line to ground fault always 3 times the zero sequence current?
I'm a little confused, I was provided the 3IO current and I was under the impression that is the bolted 3 phase current but now I am suspecting that it is 3 times Io which is the zero sequence current. My question here is, can I always assume that ... |
H: What kind of 16-pin connector is this?
I was wondering if anyone knew what this type of connector is called.
One of the wires connected to this seems to have a tear, and I'd like to see if I can get a few of these connectors for future use.
The device that this connects to is a third party accessibility Xbox contr... |
H: 21v solar panel safety issues, and how to get a consistent 12v from it
We just bought a 50w 12v solar panel but it's actually getting 21v in full sun. Are there any safety issues we should take into consideration with this getting producing almost double what it's supposed to produce? And how can we get a consisten... |
H: VHDL: Use a type, dependent on entity generics, for other entity ports/generics
I'm trying to design a memory emulation entity for simulation. To make it as versatile as possible,
it uses generics to define data and address widths. Additionally, one should be able to supply an
initialization memory image via a thir... |
H: Safety switch "breaking capacity" vs. voltage
In the context of safety switch rating (fuses, circuit breakers, etc.), the concept of breaking capacity refers to the maximum electric current which can be safely interrupted by a tripping safety switch, i.e. interrupted without the formation of an electric arc. The ar... |
H: What's the practical difference of a wait process and a sense process?
All the VHDL-tutorials I've read mentions that one can use a sense process and a wait process, but I have been unable to grasp the difference.
That is:
Waitproc: process
wait until clock ...
end process
Versus
Sense-proc: process (clock)
... |
H: Changing clock speed of STM32F779II
I'm configuring the clock of the LCD which has a max clock of 30MHz as following. Plus I'm using the touch at I2C1, and USB at 48MHz.
The clearing and painting an image to the LCD is slow, and it's not that fast, also the operations that the CPU is using is really slow. I'm not s... |
H: How to solder these tiny pogo pins?
I bought pogo pins to use for firmware uploading.
So I have to make a Jig for my PCB,
but this is the first time I use pogo pins.
I have no ideas where I have to solder, I mean I want to know if pogo pins have a direction for soldering.
as far as I know Gold surface is for bette... |
H: Resistance of mosfet's internal diode
I am an IoT solutions developer and not an engineer, so please excuse my vocabulary if not upto the mark.
I have used Mosfets such as FDD6637 and IRF9310 in my circuits for power switching and they work great for my use cases because of their low Rds(on).
From the datasheet, th... |
H: Effect of Pi Filter on the Output of LDO
Similar to my previous question on +5V Sneak path, I ran into another question now.
I have this circuit as shown.
I have an Pi Filter at the Output.
ATT has 600Ohm Impedance at 100MHz and 0.1Ohm DCR.
This 3.3V goes to the MPC5606S Micro.
My issue:
If I remove the Output cap... |
H: MCP604 op-amp output seems to jump to the positive rail
I'm hoping someone can give me some insight as to what's going wrong with this MCP604 op-amp. I'm seeing this issue on about 150 of the ICs. Below are some specs for the MCP604 and an image from my oscilloscope.
The yellow line is from the V+ of the op-amp... |
H: What is a terminal plane in high frequency circuits?
The term "terminal planes" come up very frequently in books on microwave circuits. What exactly does the term mean?
The closest answer I have got is
A terminal plane, or reference plane, is the equivalent of a terminal
pair in a low-frequency network
-Fou... |
H: How to place through solder pads of different shapes in EAGLE?
I searched everywhere and watched many eagle tutorials, but I couldn't find out how to place circle and square through hole solder pads.
In the Eagle parts list, I only found the octagon solder pad. I would really like to know how to place pads of diff... |
H: Can the microcontroller program flash memory be used for storing user configuration?
Many microcontrollers, e.g. PIC18F, have flash program memory: "The Flash program memory is readable and writable during normal operation". Does this mean I can store some user configurations in the program memory?
AI: Yes, you can... |
H: Is it bad to connect multiple electrolytic smoothing capacitors in parallel?
I'm making a power supply using a transformer and bridge rectifier, and I'm wondering whether it is a bad idea to put multiple (5) capacitors in parallel for smoothing.
The output should be capable of drawing 1.1A at 10.7V. I'm allowing fo... |
H: Suggestions to interface a photodiode in the MHz range
The task at hand is to read the variations of incoming light at speeds up to 1 MHz, with some dynamic range capability (10-1000lx with 1% accuracy would suffice).
This is to be used in a device which measures lighting quality (flicker detection in light sources... |
H: Do my specific constraints prevent me from using this Zero and Span Amplifier?
I am interfacing a thermistor with an ADC, and I have found a circuit that, at first glance, appears to suit my needs. A zero and span circuit using a single op amp.
http://www.ti.com/lit/an/slyt173/slyt173.pdf (figure 3, page 3)
The t... |
H: PSPICE Simulation of Cascode Amplifier Not Working
Can anyone please tell me why I am getting the following "floating node" errors. I have fiddled around with the resistors to see if it affects anything, so these are not the actual values. I have also read a number of post on PSPICE "floating node" errors, but noth... |
H: How to implement a current controlled voltage source, or a comparator that trips once a certain current is reached?
I have current flowing through a CCVS, once 10A is reached, the CCVS puts out 10V, which takes a comparator's output high. The current that goes through the CCVS continuous to the load. Is there a way... |
H: How to run Small Brushed Motors for Quadcopter with bare Atmega328 microcontroller?
I am trying to make a Nano Quadcopter using my Atmega328 microcontroller powered by a 3.7v 600mAh Lipo battery. I am using very Small Brushed Motors. If I directly connect motors to PWM pin of Atmega328, it will fry up my Atmega.
M... |
H: How much power is generated from a typical solar-powered watch?
I have an ABC watch from Casio that is also an altimeter, barometer, and compass. I'm fascinated that all these features are powered by solar, which makes me curious:
How much power is generated from a typical solar-powered watch?
AI: There are two mai... |
H: How to determine dielectric constant and loss tanget of a PCB board at a specific frequency?
I need to know dielectric constant (relative permittivity) and Tan loss of a FR4 board at 2.45 GHz.
The specification of the manufacturer is as it is below:
Dielectric Constant:
Test method (IPC-TM-650): 2.5.5.2
Test cond... |
H: GLCD doesn't work
I have a ts12864a-2v2 LCD and I think its controller is KS0108B. I have downloaded this lib to use it for my LCD and also my MCU is STM32F103RET6. the schematic I have used to connect LCD to MCU is this:
And the MCU's pins are connected to the LCD like this:
MCU LCD
PB0 --> DB0
PB1 --> ... |
H: LDO - SOT223 - What's the Fourth pin for?
What's the fourth pin in LD1117-33 for (the thick on the top)?
AI: I can't find a picture of an SOT223, but here is a TO-220 which follows the same principle:
You can see how the tab and the middle pin are one and the same piece of metal.
As others have rightly mentioned, ... |
H: getting more from batteries via series connection
Let's assume I have a 100W load.
If I run this load on two 2000mAh 3.7V batteries in parallel then I should get a continuous run time of 8 min 53 seconds (given the 27 amp draw).
However if I were to take the load and modify its resistance so it would draw 100W on 7... |
H: SN74HC138 demultiplexer. How do I implement a switch?
I have this demultiplexer and I need to configure it in such a way that I can control 8 transistors using its outputs. They NEED to be NPN transistors, so when I select an output using the addresses, it must give me logic level 1, not 0. The problem is, in the d... |
H: Inverting charge pump with boost converter loading characteristics
I've added a test inverting charge pump to an LMR64010 based boost regulator. This regulator outputs +12V (exact value is 11.88V) from a 7.4V battery pack.
This is a notated image from a Maxim application note showing what I did. The output capacito... |
H: NPN BJT base->emitter resistance is effectively zero?
I've been trying to better understand BJT transistors. In particular I've been trying to understand the inverting amplifier configuration. Wikipedia shows this schematic:
Which shows an input voltage Vin. However my understanding of how a BJT works tells me tha... |
H: Phototransistor bandwidth issue
I'm trying to sense IR wave with a phototransistor circuit. The circuit operates well under DC operations (I mean 3V or 0V through inputs). However, if a square wave is supplied from UART input, propagation delay increases after some frequency due to bandwidth of phototransistor(I su... |
H: What is the physical size of a logic gate?
I always hear about process size improvements in the news, but could never figure out how it translates into dimensions of a logic gate. I found a chapter from Weste's CMOS VLSI Design, that contains figures which looks like things I create when playing KOHCTPYKTOP. There'... |
H: How do I solder this tiny QFN chip
I am not very experienced with soldering. I have a basic soldering iron with a new tip, and a third hand.
Last time I tried soldering wires to a ble chip that looked like this, I ruined two chips in the process and gave up. Those were not cheap.
Now I want to solder this QFN chip ... |
H: Are IC sockets suitable for mains voltage?
I need to derive a low-voltage galvanically isolated 50 Hz signal from 230 V mains. I'll use an opto-isolator for this. I'd like to use IC sockets for all ICs in this personal one-off project.
Opto-isolators are typically suitable for mains voltage, being rated for thousan... |
H: On-Board connection of ethernet transceivers
Is it possible to connect two 1000-BaseT transceivers with each other? I have two transceivers, each of them has 4 twisted pairs that actually are meant to be connected to an RJ45 connector including magnetics. Is there anything wrong with making on-board connections bet... |
H: Impedance of waveguides shorter than 1/10 of wavelength
I read already several times that it is a common rule of thumb, that matching the impedance of a waveguide to the external network impedance is only necessary for waveguides longer than 1/10 of the wavelength of the incident signal. Is that true? And why is th... |
H: Type of switch for AC power cord?
I have a power supply that has only screw terminals for its AC mains input. Currently I'm using a power cord from a computer that I cut the female end off of and attached fork terminals to (live, neutral, and ground). It works fine but now I'd like to add a rocker-type switch to ... |
H: Does a Connector With Multiple GND Pins Make a GND Loop?
There are some cable standards that have multiple GND pins on the connector proper. A good example of this is the SATA connector (it has 3 of them).
In reality, each GND pin has a slightly different impedance, due to varying factors: connection quality, cab... |
H: Inrush Thermistor Bypassing
Hi I want to bypass an Inrush Limiter Thermistor. It is between the rectifying bridge and the smoothing capacitors, I was considering using a solid state device.
After the rectifer current only flows in one direction, so I considered using a mosfet because I have good quality ones lying ... |
H: Is it possible for the transfer function of an RLC system to have zeros other than at the origin?
I could not find a counterexample to the claim that the transfer function of an RLC system can only have zeros at the origin. Is this a true statement?
AI: simulate this circuit – Schematic created using CircuitLab
One... |
H: momentary to on/off switch for 12v
I got some oem switches and I want to mod them into light switches.
Here is my situation:
I would like to use the oem switch since it has illumination and button that matches the car.I have already located the illuminations and found out the switch is momentary.
I'd want them to ... |
H: AD620 with load cell help!
I have bought a 200kg load cell and an AD620 in-amp. I only want to use 100kg as the maximum weight capacity. I want to power the load cell and the in-amp from the 5v pin of the arduino. The seller can't give me the specifications of the load cell so i'm actually having some difficulty c... |
H: Why a MOSFET in accumulation mode is not conducting?
In accumulation mode, the channel is not conducting, whereas in inversion mode it is conduting. But if in both cases I have free charge carriers in the channel, why isn't there conduction in both cases?
I know that the energy band diagram between the semiconducto... |
H: Independent voltage sources using voltage regulators?
I'm trying to design a variable power supply, and need some clarification regarding using voltage regulators in parallel as independent voltage sources.
As this is a power supply, one of the outputs may not be used.
My question is, if say V2 is set to 1.2V (the... |
H: Why use a 0 ohm resistor?
My customer's schematic uses a 0 ohm resistor for connecting analog(AGND) and digital (DGND). I think it is for testing, current measurement , fuse, jumper, test point etc but is there another reason?
AI: In a mixed signal system it's recommended to join AGND and DGND close to the mixed-s... |
H: Final voltage of two parallel (switched) capacitors
I am trying to obtain a resistance-circuit equivalent to a switched-capacitor circuit. It is the first stage of a ladder filter.
simulate this circuit – Schematic created using CircuitLab
Two switched capacitor C2 and C3 are charged (during the current semi-perio... |
H: Thevenin Voltage of the circuit
Suppose I have the following circuit, How do I compute Vth using the node voltages?
I simulated a circuit similar to this one with values.
I got:
Vnode1 = 5.93 kV
Vnode2 = 12.4 kV
Vnode3 = 5.64 kV
With Isc = 1.85 A and Rth = 1293.53 ohms, I got Vth = 2393.65 V.
Playing with the node... |
H: Is it ok to drive a stepper motor below it's rated current?
I got two of these:
Frame size 42 x 42mm - NEMA 17
1.8 degree step angle
Length 47mm
Holding torque 44 N.cm (4.4kg.cm, 62oz.in)
Voltage 2.8V
Current/Phase 1.68A
Resistance/Phase 1.65ohm
Inductance/Phase 2.8mH
Inertia 68g.cm
Bipolar, 4-wire
I'm using a mic... |
H: Driving a stepper motor to a set force
I am trying to drive a Linear Actuator (stepper motor with a lead screw) to drive until a force of 15 pounds is reached then stop. I am having trouble finding a good method to do this (I am new to stepper motors) can anyone point me in the right direction?
I am thinking of g... |
H: inverted input for adc
I am using ADC122S625 (Datasheet: http://www.ti.com/lit/ds/symlink/adc122s625.pdf).
The ADC has a differential input per channel. My signal is from a RF devide with 3V peak to peak and 1.5V DC offset. I want to use the ADC in Single-Ended Input Operation. So I have choosen a Reference Voltage... |
H: Analyzing reflection and transmission without a VNA
The wikipedia page for network analyzers mentions "reflection and transmission of electrical networks are easy to measure at high frequencies" but doesn't give any hint on how this is done or what it is that's called "high frequencies" there (I'm guessing it's the... |
H: battery balancing
I am using a balancing circuit for a 3S (3 series 11.1V) li pol battery. The chip I am using is the S8204B. I am unable to understand the datasheet properly. I have basically 3 components in my system -
1) Li pol charger circuitry, 2) 3S li pol battery and 3) Load.
The datasheet states EB+ and EB-... |
H: transistor level design of Op-amps
How do we realize the design of a simple Op-amp with Bipolar Junction Transistors or MOS Field Effect Transistors alone? I mean I understand the need for differential amplifiers for providing a differential mode gain and I understand the requirement of Darlington pair as voltage a... |
H: How to wire subwoofer to 2.0 channel amplifier
How to wire the sub-woofer amp to existing 2 channel amplifier?
I have dual LM386 for left and right channel and I would like to connect a sub-woofer.
where should I wire the sub ?
Is it in the right channel or the left channel and before LM386 or after or combine bo... |
H: what do you connect to IN+ and IN- for ADC differential input configuration?
I was trying to understand how to read analog inputs on a raspberry pi. I found this video post and I think I understood how it works.
https://www.youtube.com/watch?v=oW0mTwFck_c
This video uses a potentiometer and read its analog outputs... |
H: How to connect a four route MOSFET to multiple power sources?
I have this four channel MOSFET switch:
I have connected one RGB LED-strip to this, and controlling it from an Arduino, and this works great.
The problem is that I need to control four of these LED-strips, and they each need 12V. So I wan't to remove th... |
H: What are the AC characteristics of a battery?
I'm planning on building a single cell AA NiMH battery charger and in the process I decided that I must also build a battery simulator to help me debug the charger. In my research, the best simulator circuit I came across was the one described in the Linear Technologies... |
H: How to generate Duty Cycle from DC without 555
I am currently working on a simple circuit which includes creating duty cycle from DC. Also, I need to change it's pulse width with time. I have decided to use op-amp relaxation oscillator to produce square waves but I have no idea how to chance it's width. I am allowe... |
H: Understanding capacitor usage in the Sparkfun arduino
In the schematic for the Sparkfun Arduino mini pro 3.3v https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Arduino-Pro-Mini-v14.pdf
there's a 0.1uF capacitor (C3) just left of the atmega ground pins going from vcc to gnd. In the upper left corner on the pow... |
H: How to interface two wire & three wire SPI device?
ADC AD9266 Here is the datasheet of ADC AD9266. page no 25 of it is SPI
I'm working on a Project where I have to interface my ADC with MCU 8051. The Problem I encountered with is my ADC supports two wire SPI mode ( SCLK , SDIO pins ) while my MCU has three wire SPI... |
H: Why do we need a ramp for stepper motor?
I am a newbie and trying to understand how i can run a stepper motor. The concept i had in mind was that steppers need digital pulses to run, and i tried it out too. I was able to run the stepper i am using very easily. But lately I came across a link where they have used a ... |
H: Why is the LT1054 circuit providing far more than double voltage?
I created a LT1054 bipolar doubler circuit. I am using Linear Technology's chip.
My supply source is measured at 6.1V. My finished circuit is providing -16.2V and +21.5V.
Besides being far beyond double, there is quite a difference.
I have never work... |
H: Is it ok to feed the output of one LDO regulator to the input of another?
Sorry if this is a stupid question, but I am mainly working with 5V PIC circuits and now want to integrate a component (nRF24l01+) that needs a 3.3V supply.
As I have a box full of ~7V wall-warts, I normally use a 7805 or similar LDO regulato... |
H: Steady State Error of controlled loop system
I am trying to calculate the steady state error of the following system but unable to do it. I have used MATLAB and calculated the steady state error to be 0.1128 but don't understand the steps that I need to do to calculate this.
Please help.
Thanks
AI: Here is how you ... |
H: Control multiple servos using pic18f microcontroller?
I want multiple servos to be controlled through pic18f4550 microcontroller.
I know for a single servo I can use the following code.
unsigned int angle=0,i;
void cs_delay(unsigned int);
void main()
{
TRISB.F0=0;
while(1)
{
for(angle=0;angle<=180;... |
H: Bluetooth audio stream to commercial headset
I would to connect my simple audio player (Arduino + https://www.sparkfun.com/products/11125 ) to a Bluetooth headset you can buy at the market.
How can I do ? Is it possible ?
AI: Did you look at this module also on spark fun?
It has an embedded stack you just configure... |
H: Safety when charging two LiPo cells in series
NOTE: I am asking this question because I am new to this subject, and I want to be sure about what I'm doing before I go out and buy parts.
I am making a really fancy watch with an OLED screen, sensors, and all those goodies, along with an arduino nano requiring 7-12V i... |
H: Capacitance value - AC RC Circuit - Impedance Method
Here is the circuit:
simulate this circuit – Schematic created using CircuitLab
\$
V_i = \frac{8}{\sqrt 2} \angle0° V\\
V_c = \frac{6}{\sqrt 2} \angle45° V\\
R = 1000\space\Omega
\$
I'd like to know how to find the capacitance with these given values. What I've... |
H: How does a constant current (CC) power supply regulate voltage (V) in parallel circuits?
I see that some power supplies provide a wide range of output voltages meanwhile maintaining the current.
For example: 2.7 A, 20-36 V output.
I understand that the voltage rate will depend on the end-unit consuming the power (e... |
H: Unable to toggle SN74HC109
I'm a complete amateur, I've probably gotten a million things wrong with this already. I'm using an SN74HC109 dual j-k" flip-flop chip. I'm trying to toggle the led (forgot to add a resistor in the diagram, ah, also forgot to add a line from 5V to Vcc.) with a momentary switch. When the c... |
H: Controlling heater with PWM through MOSFET
I'm trying to control a heater coil (resistance ~0.9 Ohm) with PWM using a MOSFET. PWM modulator is based on LM393, MOSFET is IRFR3704 (20V, 60A).
If I place 1k resistor in place of heater everything runs fine and waveforms at testpoints CH1 and CH2 are nearly square. But... |
H: PWM-stimulated N-channel MOSFET unexpectedly always on
Electronics!
I would appreciate help with the following problem:
Goal:
Get 12V PWM-modulated from a microcontroller-generated 5V PWM.
Elements:
• IRLML2502, n-channel FET - Datasheet
• Resistors R1 (56 Ohm) and R2 (6K8 Ohm)
Reduced schematics:
P... |
H: Is there a sensor capable of measuring distance?
I'm looking for a simple way to measure the distance between 2 devices, basically 1 device will be placed in each leg and one of them will measure the leg stride, at any moment, by calculating the distance between both mechanisms.
I've read you could measure distance... |
H: A Question on Resistance
A 19 v dc supply is switched to an IC amplifier. A 12 V dc, 100mA pilot lamp,(nonLED)is wired in parallel with the switch to indicate an active circuit. What size resistor is needed to support the pilot lamp ? My research indicates 70 ohm, but I am a newb.
AI: If the lamp and its series bal... |
H: Pololu Pushbutton Power Switch
I am replacing my auxiliary light switch of my car.
on the switch assembly, it has a positive, negative, and ground.
I am replacing it with a pololu pushbutton power switch with an oem switch that is a momentary type.
Here is the switch: http://www.pololu.com/product/750/pictures
Posi... |
H: Puzzlement on Evaluating the Datasheets of a GLCD
I have decided to use an LCD display for my project. In order to learn how to use one, I have consulted its and its drivers' datasheets. Here are the links for them:
Link for the LCD display's datasheet: WDG0151-TMI-V#N00.
Link for the LCD display's segment drivers'... |
H: Mplab X Programmer selection
I am using Mplab X IDE. My question is what does the colours Red, yellow and green dots during selection of programmer indicate ?
AI: It refers to the combination of programmer / target chip:
Red means not supported in MPLAB-X, though third party tools may work with it (such as a picki... |
H: Do microcontrollers have cache?
I wonder if microcontrollers normally have cache or not.
What is the common case?
If not, what could be the benefit behind this?
AI: Some do, some don't.
Low-end MCUs don't as a general rule. The reason for this is they're pretty simplistic devices with no pipeline or other optimi... |
H: Colpitts oscilator - purpose of voltage divider
I'm confused by the Colpitts oscillator shown below:
I've marked my understanding of the various components, but I'm having trouble understanding the tank circuit.
My understanding is that C1 and C2 form a voltage divider. However, I'm assuming Vin is coming from the... |
H: PIC to PIC serial communication
I need to send all port info from one pic to another using serial port..
currently using 9600bps baud rate. on pic18f4550 running at 20mhz clock.
i have used this code to send and receive data of a single port.
send:
while(1)
{
TXREG=PORTB;
while(PIR1.TXIF==0);
delay_ms(1... |
H: Two different 3-AND gates: correct implementation?
One of the questions in my textbook (Introduction to Computing Systems) asks to design a 3-input AND gate. The given solution is as follows:
simulate this circuit – Schematic created using CircuitLab
If I am reading this correctly, this is a 3-NAND–NOT combinatio... |
H: How do I deal with ideal current and voltage sources in my circuits?
Data given: electromotive force of the ideal voltage source \$E=20V\$, power output of the ideal voltage source \$P_e=3.333W\$, current of the ideal current source \$I_s=4A\$, power output of the ideal current source \$P_i=56/3W\$. The task is to... |
H: What is this symbol on the schematic?
What is this element on the far right of schematic described as "270 OHM"? Is this some kind of inductor? What is its purpose in this device (this is a reference design of dc-dc power supply of sim900 taken from its datasheet) and what would be an exemplary part number?
AI: It ... |
H: LDO Regulator ADP3338
I was looking the ADP3338 LDO Regulator of Analog Devices and i'm wondering whats the output voltage of this LDO?
http://www.analog.com/static/imported-files/data_sheets/ADP3338.pdf
Is the output voltage same of input?
AI: Is the output voltage same of input?
What would be the point of that?
... |
H: How does this voltage detector IC work in a circuit? What does open drain vs. CMOS output mean?
I'm evaluating the Rohm BD48/BD49 series voltage detector. I'm having trouble understanding the data sheet.
I want to generate a high signal when the input voltage is above a desired threshold (3.0 volts, so the BD4xx30... |
H: Why don't we use capacitors containing multiple kinds of dielectric in a single package?
I know that it is common in DC regulators to use both a high capacitance electrolytic capacitor and a low capacitance ceramic capacitor in a parallel, in order to maintain sufficent capacitance over a wider frequency range.
Why... |
H: Simple RS232 to 8 bit Parallel circuit
I want to make a simple rs232 to parallel (8 bit) converter.
I would like the input to 1 wire and the output can just be 8 bit with no strobes etc. and run at high speeds (ideally up to 1Mbps, put ~100kbps would be ok)
Ideally, what would be simplest circuit to achieve this? I... |
H: JK flip flop random start outputs
I am working on a project for college and I have to implement a sort of alarm using only MUX's and JK flip flops and a bread board. The problem I encountered is that whenever I power the whole circuit my flip flops have random outputs. I have 2 SN74HC73's meaning I have 4 flip flop... |
H: I need help in starting this 7segment from 0
I am making a control system as my project. Here i have used 2 555 timers one in monostable and the other sin astable. The monostable outputs when process one button is pushed and this also triggers the astable 555 timer. The 7 seg attched to the monostable 555 which is ... |
H: PIC24 PLL module is always out of lock
I have been working on a PIC24FJ128GA310 development board for for some time now and recently got a PCB made. If I try to move my code into the new board all timing related math and functions are failing on HS oscillator even the UART lines wont work at the desired baud rate. ... |
H: WLCSP MCU's - what hardware is needed for programming these tiny chips?
I just received my DigiKey order of some Atmel ATTiny4 MCU's from DigiKey. I wanted to tinker with one of the smallest MCU's I could find, and this was one of them.
It is, in fact, so small because it is wafer level chip scale packaging (WLCSP... |
H: No output from Transimpedance Amplifier
I'm trying to set up a transimpedance amplifier reading the response from an avalanche photodiode (Hamamatsu S12572-100P http://www.hamamatsu.com/resources/pdf/ssd/s12572-025_etc_kapd1043e03.pdf) and a low-noise operational amplifier (TI LMV793 http://www.farnell.com/datashee... |
H: What is the maximum voltage of a Lithium Ion Battery
My question is about the maximum charge voltage of a Lithium-Ion cell.
I have charged my battery pack with 8.4V (the maximum voltage). The pack is a Samsung ICR18650-26F. The pack has a smart controller with a maximum voltage of 8.5V. This is 4.25V per cell.
I re... |
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