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H: Altera DE1 and DE2 - same UART?
I wonder if the Altera DE1 and DE2 have the same UART? I got access to both the DE1 and the DE2 and I see a similar question but the manual isn't specific which FPGA is applicable.
UART core Altera De2
AI: When talking about FPGAs we need to distiguish between "hard cores" and "soft ... |
H: Why are Ethernet jack center taps connected to VCC?
Taking this schematic as an example:
EtherTen
Can someone explain to me why the center taps of the transformers (TXCT, RXCT) are connected to VCC? I've seen this connection in many (although not all) schematics on the Internet.
What would happen if they would be ... |
H: Antenna: Impedance matching vs. tuning
I always try to tune my pcb antennas in length, so they operate in resonance, by cutting the antenna with a scalpel and then matching the tuned antenna to the transmitter.
But recently an RF engineer told me, that you could sometimes get the same radiated power, by matching th... |
H: Which capacitor to choose for ACS709 to filter 50Hz noise?
I am using the ACS709 current sensor together with an Arduino board to measure the charge/discharge current of a large battery connected to an UPS.
I noticed a strange noise pattern in my DC measurements, which seems to be 50 Hz. I guess it must be the UPSs... |
H: LM317 with a load of less than 1.5A
The LM317 is rated for "in excess of 1.5A", I have an application that will have a load current of about 300mA. Are there any drawbacks to using this particular IC?
This is my intended setup:
simulate this circuit – Schematic created using CircuitLab
AI: Downsides:
Ancient tech... |
H: Can I use one voltage divider to bias multiple points in circuit?
I have 4 nodes in my circuit that require virtual ground of half the power supply voltage. 2 of the nodes are just offset for input signal and other 2 are for op-amp biasing to virtual ground.
Can I use one voltage divider to provide offset for all t... |
H: Modelling a capacitor whose dielectric has resistance as a circuit element
Modelling a capacitor whose dielectric has resistance as a circuit element @ Physics Stackexchange
The issue of 'how to model the capacitor' arises if the dielectric of a parallel plate capacitor has a finite resistance.
As the diagram ind... |
H: Why dc component I must flow entirely through the load resistance R in buck converter?
The excerpt below is from Fundamentals of Power Electronics by by Dragan Maksimović and Robert Warren Erickson.
Can anyone explain the why question in the yellow part below? Why dc component I must flow entirely through the load ... |
H: How does series feedback pair work? (the art of electronics)
I'm studying AOE but i can't figure out how this circuit even works(also i'm confused if Q1 and Q2 make a sziklai pair). any help with the circuit description will be great.
AI: I'm studying AOE but i can't figure out how this circuit even works
If the ... |
H: led drivers and voltage overhead
More specifically this RF transmitter which has an incorporated led driver: http://www.mouser.com/ds/2/368/Si4012-35123.pdf
It specifies 4 levels of current on the LED output pin but nothing on voltage overhead. This IC is going to be powered from a 3.3V rail. Will a 1.6-1.8 forward... |
H: Protect lithium battery in parallel
This question is somehow the continuation of this question : Batteries and running time (reed the comments for more information)And my question is, can I protect my lithium battery in parallel like so ?I got this "trick" from this document : http://www.ti.com/lit/an/slva139/slva1... |
H: Can Solar Panels Be Made From Other Semiconductors?
I have heard that most solar panels use polycrystalline silicon. It seems like a very expensive material. Are there any other materials we can potentially use to capture photons in solar panels?
AI: Yeah, there are many many other materials that could be used. Pla... |
H: Understanding PIC32 digital output with open-drain
I'm trying to understand how to operate digital pins configured as open-drain outputs on a pic32. As I've read on other forums, setting TRISx to 0 and ODCx to 1 configures the pin as open-drain output, and writing 1 to LATx will drive the output high-Z (w/pullup re... |
H: Is it possible to jam wireless home alarm systems?
Sorry if this is the wrong community for this question but in my mind, it's the best fit. Please close or move to a more appropriate community if it's off topic.
The other day, several home alarm companies came to look at my home to quote an alarm system. They all ... |
H: Which is the right voltage divider formula?
I've come across two variations on the voltage divider formula, when solved for \$x_2\$:
$$R_2={R_1V_{out}\over V_{in}-V_{out}}$$
$$R_2={R_1\over {V_{in} \over V_{out}} - 1}$$
I solved the one equation I can find that most sources agree on for \$R_2\$
$$V_{out}={V_{in}R_2... |
H: Overcoming a boost converters soft start function
I am using a TPS61235p to boost a 3.7V 18650 battery to 5.1v with a pure-resitive load of 2Ω. I expect it to draw 2.5A, but upon pulling the enable pin high the output current is limited to about ~1.75A due to the soft-start functionality described on page 10 of th... |
H: Is routing signal traces under components a good idea
This is my first attempt to route a 4 layer board. But I was curious if routing signal traces under components like this is a good idea? Allowed? Or what?
These are 0603 components.
AI: The answer as always is: it depends.
In general, if the PCB design rules all... |
H: Why will my led not light up & why does my input voltage fluctuate when I add a wire?
This design is suppose to light up the LED When the sensor is under light, and turn off the LED when the sensor is covered.
I noticed two problems:
My LED won't light up.
When I measure the voltage input difference (expecting
+... |
H: Building a pH meter circuit - is it feasible?
Let's say I have a budget of $15-20 to build a pH meter. I will then read the analog values from a microcontroller or such, but I want to first focus on somehow getting a reliable pH value on a shoestring budget.
First of all, is this even possible for an electronics ho... |
H: Voltage Range Mapping/Conversion from [-12V, +12V] to [0V, 4V]
I have a similar problem as javier acha already described here
Convert from a specifc range to another one which is to map a (AC, 100Hz) voltage range from [-12V, +12V] to [0V, 4V]. I am currently trying to solve it using the OpAmp approach.
This is why... |
H: logic OR gate with 2 diodes in series
is it possible to make a logic OR gate with 2 diodes in series like this:
simulate this circuit – Schematic created using CircuitLab
For my project this would be easier to wire than the usual parallel configuration.
AI: No, not as you show.
Even without getting into the logic,... |
H: BJT Transconductance Decrease with Increasing Base Voltage
Hello Everyone!
I am going through transistors and trying to apply it to some RF applications. I am following Sedra and Smith. In the Sine wave generation section (via feedback), it says if the base input amplitude (a in diagram) increases in magnitude, th... |
H: Voltage regulator from first principles - why is power dumped in the transistor?
I'm trying to further my understanding of electronics, so I decided to try to design a fixed voltage regulator capable of supplying an amp or so. I put this together from first principles without referring to any kind of reference on h... |
H: TRS female jack symbol in Kicad
There is a device which is powered and also outputs signal by its TRS connector as shown below:
This TRS connector needs a female correspondent for my circuit.
I made a small board and need to add my schematics the female jack of this TRS.
In KiCad there is the following symbol:
B... |
H: How often should the CMPS11 be calibrated?
I have a project with arduino and the magnetometer CMPS11. I wanted to know how often the CMPS11 should be calibrated using this procedure: https://www.robot-electronics.co.uk/htm/cmps11i2c.htm
AI: Calibration of the CMPS11 for horizontal only operation. So it should not h... |
H: 6 Wire Stepper motor with only 1 Center tap
I salvaged a stepper motor from an old computer i had laying around, it has 6 wires. The problem is that when i try and measure the resistance between the wires i only get 1 Center tap where the resistance is halved. All other 5 wires are connected to the same coil. I tho... |
H: 50 Ohm Oscilloscope Input
I connected a 50 ohm function generator to an oscilloscope set to have an input impedance of 1 MOhm. I set the generator to 0.5Vpp and saw a 1Vpp signal on the oscilloscope. The generator display is set for a 50 ohm load, so this all makes sense so far.
Then, I switched the oscilloscope to... |
H: Long tailed pair little confusion
The first approach :Assuming 0v at both bases, when the base input of Q1 rises, its collector current rises and its collector voltage goes down. When the base input voltage of Q2 rises by the same amount, the same happens and its collector voltage also goes down,so the voltage diff... |
H: PC Fan PWM signal circuit using 555 timers: Can anyone explain this circuit to me?
I'm looking at building a 4-wire PC fan PWM circuit. The goal of such a circuit is to send a PWM control signal to a 4 wire PC fan, so that the fan can modulate it's speed (NOT to pulse the 12V supply).
One circut for this that is wi... |
H: How can I determine the signal level needed into a given antenna to produce a given magnetic field at a given distance?
I have an ETS Lindgren 6511 loop antenna that lists a magnetic antenna factor of -2.5 (best I can read the graph) at our frequency of interest.
I've found lots of information on establishing a gi... |
H: What is the name of this connector on the end of a serial cable (not DB9)?
I just found that a piece of hardware I would like to connect via a serial port uses a non-standard hardware connection.
One end is a female DB9 the other is what I think is an "old" telephone connector, but I can't seem to find the name o... |
H: How to limit voltage charge of supercapacitor
For a DIY project, I plan to charge an 100F 2.7V Supercapacitor using a 3.7V Lithium-ion 18650 battery. However, I need it to charge only until 2.25V.
Is there a simple circuit that I can build to limit the voltage\charge?
I basically need the stored energy to be ~250J... |
H: What does mean I2C Firmware controlled Master operation, Slave is IDLE
I am trying to learn I2C bus. For learning purpose, I am using PIC 16F72. In PIC 16F72 microchip datasheet, I see if I want to use this microchip as a master it has a mode which is
I2C Firmware controlled Master operation, Slave is IDLE
[p. ... |
H: How to designate a specific portion of a design in altium
I copy and reuse portions of a design, I'll copy and the designation numbers follow the copy (for example: I'll have U1 and R2, then copying you end up having to U1's and two R2's, I don't want that.). There are sections that I'd like to re-designate (or cle... |
H: Ripple when switching on MOSFETs with PWM
I'm currnetly trying to construct an electronic load for testing purposes and experimentation. This is my schematic:
R2 are 7 X 4.7 Ω , 150 W each, resistors in parallel to cope with power up to 1kW needed. PWM is generated from an Arduino Uno, and is seperated from the re... |
H: What is the advantage of a Sallen-Key filter over a normal second order filter?
Wikipedia links to a Sallen-Key filter as a active low pass, so I tried it out with LTSpice.
The frequency response and phase response are not linear, instead frequency response even gets higher after 10kHz. Why is that, and why would I... |
H: Picking the right opamp
I've been designing some active bandpass filters and, while in simulations it works great with ideal op amps, I'm not sure how to go about picking an op amp from a distributor.
Obviously there are an uncountable amount of options when it comes to choosing parts, and I can do my best to narro... |
H: How to design CMOS bridge rectifier?
I designed the bridge rectifier circuit.
I wnat to make a full-wave rectification. so, I made a CMOS circuit.
I refered to other papers. Figure2.
"An ultra-low-voltage self-powered energy harvesting rectifier with digital switch control"
Link:
I think this circuit is full-wave... |
H: How do I create circular polygon pour cutout in Cadsoft EAGLE?
I would like to have a cutout without copper within a polygon pour. I tried to draw a circle on the top layer but to no avail.
AI: You want to draw your primary copper pour on the top (or bottom) layer, and the circular cutout on the appropriate Restr... |
H: Are there risks in connecting the power pins of separate development boards?
I am connecting the SPI bus pins of two development boards:
NVIDIA Jetson TX1
Cypress C8CKIT-030
They are each connected to their own wall-wart power supplies. I have confirmed that the connected pins are all operating at 3.3v. However, ... |
H: Low frequency response of a BJT amplifier.How is the cutoff frequency equal to \$ \frac{1}{2\pi (R_S+R_{in})C_{in}}\$ in fig 2
In a low frequency region of the single stage BJT amplifier, it is the
RC combinations formed by the capacitors \$ C_{in},C_E,C_{out}
\$ -Electronic Devices and Circuit Theory-Boylestad... |
H: std_logic minimal example
Regarding different types of std_logic in VHDL, there are little information about the real differences among some types.
TYPE std_ulogic IS ( 'U', -- Uninitialized
'X', -- Forcing Unknown
'0', -- Forcing 0
'1', -- Forcin... |
H: Which motor driver to use with a DC gear-box motor?
I have this motor (a "PMDC Spur Gear Motor/KGA25RP")
I am not sure if something like L298 will work with it since it is a DC gear-box motor. What kind of driver should I choose?
AI: The L298 H bridge IC has a maximum supply voltage of 50 V and a maximum continous ... |
H: Equivalent resistance of a set of n resistors?
Is the equivalent resistance across a set of n resistors connected in series greater than the equivalent resistance across them when they are connected in parallel? I want to find the relation between \$R_s\$ and \$R_p\$.
My attempt:
Let the resistance of the resistors... |
H: How to test if an IR sensor is broken?
I have a feeling my IR sensor does not work. To make the most 'low level' test possible I want to check if the +5 and GND are working/are on the pins I expect:
On the right pin put +5 (according to pic below)
On the middle pin GND
On the left pin the data signal
Can I assume... |
H: Variable wattage vs temp control in a soldering iron?
Presently, I am looking into soldering irons because I am considering making a purchase. I am considering features in order to find something that is usable and versatile for the value.
One factor I am struggling with a bit has to do with temperature vs. wattag... |
H: Proper use of pull-up and pull-down resistors
A pull-up or pull-down resistor is used to set a default voltage level somewhere in the circuit. Since in electronics we dislike random behavior, should we overuse these resistors?
When a microcontroller starts up, output voltage level is usually unknown. Are pull-up/d... |
H: Electronic wearing of a printed circuit board?
I was told that electronic components and printed circuit boards have a limited lifetime. This is backed by several questions and answers:
https://www.quora.com/Do-circuit-boards-have-a-useful-life
https://www.quora.com/How-long-do-circuit-boards-last
It is however unc... |
H: controlling ceiling fan speed to minimal
Currently, the fan is still fast for me on number 1 speed. Is it possible and how to reduce this speed further using any device.
AI: It might be possible to reduce the speed by a limited amount. Ceiling fan speed reduction is done by various means of making the fan weaker so... |
H: What is this symbol? (assumed compliance mark like CE / FCC)
So Raspberry Pi have a new model out (the Raspberry Pi Zero W). Having taken a look at the photos, I see that on the reverse, where the CE and FCC compliance marks are shown, there is another symbol. It's hard to describe - something like a "T" with a par... |
H: Counter inputs ENT, ENP and output RCO
I am using an IC 74162 (decimal counter) and I know that both enable inputs ENT and ENP must be on so that the counter works, but I am not sure about the difference between them, and their relation with the output RCO.
Thank you!
AI: A 74162 is a decimal counter.
The EN input... |
H: FPGA Memory vs Registers
I'm having an issue on an FPGA project I'm working on. I'm unable to write to defined memories within the FPGA, but writing to registers works fine. I was thinking about working around this problem by simply using registers as memory. I only need to store a max of ~1024 bits at a time, and ... |
H: Horn disturbs controller and lcd on common power source
I have a 60V battery which feeds a PCB itself switching down the voltage to a 12V bus and then from 12V to a 5V bus using two consecutive TI TPS54560 switching regulators (5A max current). I have a MCU connected to a LCD powered by the 5V bus. The 12V bus powe... |
H: practical Mosfet circuit Y/N?
Hi
im trying to activate non-logic Mosfet using Arduino
as in img. is that ok or the mosfet will still on?
AI: As per my comment here is a simple way of using the 24V supply to switch the MOSFET from the arduino (0 -5V) signal.
When Q1 (NPN) is turned ON (input 5V to R1) it pulls a s... |
H: Self-resonance frequency of MLCC in Buck converter circuit
Let´s assume I use a synchronous buck converter switching at 1MHz and a 47µF MLCC at its output whose self-resonance frequency is right at 1MHz.
For my understanding, using an DC/DC converter output capacitor near or at its self-resonance frequency is not a... |
H: What is "burnout current" in an AD7730?
There are "Burn Out" bits in the mode register. I don't see a good description in the datasheet.
How can I use these correctly? I don't want to spoil the ADC...
AI: The "burnout currents" are current sources that you can turn on and off for diagnostic purposes. In other wor... |
H: Toggling between 3 frequencies
I currently have a program that runs at X frequency, with the clock input generated by a slow clock module that divides the default clock via the counter increment method.
However, I wish to be able to switch between 3 frequencies, X, Y and Z using button presses. I have debounced the... |
H: How does an outlet know what wattage to put out?
In the UK, if that makes any difference, I was wiring a motor and then I wondered (and kinda needed to know), how does a plug socket know how much power to put out? because all the input ampages on all the plugs sad different things but can all be plugged into the sa... |
H: Starting Oscillation in Sine Oscillator
Here is a simplified digram of a sine wave oscillator (part of Colpits oscillator arrangement) stressing on the LC circuit. I am concentrating on the event at T = 0 sec.At the beginning, the inductor L2 would act as short and C3 and C4 will charge up to same potential. And h... |
H: How low can I make the source impedance of a PIC16F887 ADC?
Microchip recommends 10K for the maximum source impedance of the ADC, but it says nothing about the minimum value. How low can I make the source impedance ? It is possible to damage something if it's to low ?
AI: You cannot damage it provided you don't exc... |
H: Vhdl Error (10500) near text "when"; expecting ";"
this is the error: Error (10500): VHDL syntax error at Bin7SegDecoder.vhd(15) near text "when"; expecting ";"
It may be simple but I don't know what's the error.
Thanks in advance!
library IEEE;
use IEEE.STD_LOGIC_1164.all;
entity Bin7SegDecoder is
port( enab... |
H: Line of switches on a breadboard
I'm connecting 8 switches on a breadboard, with a common ground (the already-connected line of the breadboard):
Problem: these switches are always on, like if the 2 pins on the common line make them pressed.
I thought that a solution could be to rotate 90° the switches, but then t... |
H: Solder paste for stencil
I'm going to solder a small pcb with reflow process and I'd like to use a stencil for that because the components are too tiny for hand soldering iron.
The pcb has a QFN32 (0.5mm pitch and exposed pad), and some passive components, most of them 0402 and few 0603.
I haven't done this before ... |
H: Is it D-Type Flip Flop?
today I'm working on a new chipset named : "8-Bit Shift Register/Latch with 3-STATE Outputs" also referenced as "CD4094BC", and I've got the following logic diagram :
On this picture I know that the gate in the red square is a tri-state output, meaning that the output stay undefined if "out... |
H: 1N5821 Schottky diode material
Is the 1N5821 Schottky diode made of silicon? Or is it composed of other materials?
AI: From the datasheet:
This series employs the Schottky Barrier principle in a large area
metal-to-silicon power diode. |
H: Reverse saturation currents of a LED?
What are the typical values of reverse saturation current of a LED? In particular is it possible to have a reverse saturation current of \$10^{-17} A-10^{-18} A\$ for a (red) LED?
For a silicon diode the typical values are \$10^{-9}A-10^{-12} A\$. Do LEDs have much lower revers... |
H: Can I just use one end of a differential op-amp ? (ie use differential op-amp as a single ended op-amp)
I found this awesome op-amp I can use which is super cheap and super fast (NE592D).
Unfortunately, it has differential inputs and outputs. I can probably deal with the differential inputs, but how can I convert ... |
H: Internal thermal limit of LF00 voltage regulators
Reading the datesheet of the LF00 voltage regulator series leads to a basic question to myself.
The basic facts at the beginning of the sheet telling me, there is a logic with an
INTERNAL CURRENT AND THERMAL LIMIT
inside the component. I was very interested in th... |
H: Eliminating ghost voltage and breaking ground loops in a system
The above illustration is a setup I use where amplifier outputs go to a data acquisition system through BNC cables. The data acquisition system is earth-grounded. Mains system voltage Line to Neutral is 230VAC.
A1, A2, A3. A4 are force-transducer ampl... |
H: Can this circuit drive directly a led ( or even supply a BJT )
I've this PIR board:
https://www.mpja.com/download/31227sc.pdf
the chip output has already a 1KOhm resistor in series, so, since the one voltage of the chip is 3.3 V I guess I could connect directly to a led without having to add another resistance. Is ... |
H: Why ground plane is placed in helical antenna and how to calculate size of this ground plane?
In most of the helical antenna, I have seen a ground plane, what is the role of this plane and is there any size restriction for this plane? I am trying to design a helical antenna with minimum ground plane size.
AI: what ... |
H: Advantage of using AC generators in cars instead of DC generators
Most cars use an AC generator then convert its voltage to DC via a bridge diode rectifier to charge the 12v battery.
Why wouldn't a DC dynamo be used instead?
Is it because AC dynamo gives better efficiency?
(Even bike and wind energy use AC dynamo/... |
H: DC block using microstrip line
While implementing an RF amplifier circuit, I came across the fact that micro-strip RF chokes are better for narrowband applications and easy to realize than physical inductor.
My question is whether it is possible to implement DC blocks using micro-strip line. If it is possible what... |
H: How does this transistor radio mixer work?
I recently picked up a transistor radio, a Unitra Nova 206. I've been studying the schematic with an interest in the AM operation for now. Most of it makes sense and I've included an annotated snippet below.
Looking at the transistor pair T3 and T4 you can see that the ... |
H: Export Modelsim waveforms as image for printing
I want to export the Modelsim waveforms of my simulated design in a form where they can look decent when printed. To be more specific, without the black background, in a vector format preferably.
Not something like this:
But instead like this:
The schematics are ind... |
H: Can't I make 12V source to feed 12V motor?
I have a system which includes a Raspberry Pi, 2 a L298N module, 12V Battery source(8x1.5V AA) and a motor (a "PMDC Spur Gear Motor/KGA25RP")
When I connect everything right and run a simple program, only thing I see is a very low buzzing sound from motor while program run... |
H: Concurrency concept in VHDL
Regarding the concurrency of VHDL statements, I want to know how the following code is explained with concurrency.
entity foo is
port( a: out bit;
b: buffer bit;
c, d, e: in bit);
end;
architecture bar of foo is
begin
a <= b xor c;
b <= d and e after 5ns;
end;
... |
H: Does triac used for on/off purposes need RFI suppression?
I noticed that in dimmer circuits using a triac there is a need for chokes to suppress RFI, Do on/off only circuits need the same?.. Please I need a detailed explanation or references to understand (not a yes or no answer)..
AI: Umm..how can I make this simp... |
H: Why base current changes with collector emitter voltage?
There are two questions in stack exchange similar to mine, but I though mine was more basic and also more specific.
I tried doing some SPICE simulations in order to understand transistor characteristics described here, but using a real transistor, i.e., 2N22... |
H: Problem with testing 74ls173AN D flip-flop
I'm building a simple 4-bit computer (a Nibbler) from 74 series ICs on a breadboard. Right now I'm working on 74LS173AN IC registers. I can't make it work. I have connected the input enable (pin 9,10), output control (1,2), and clear (15) to ground and some data inputs to ... |
H: Is perfboard generally lead-free?
While shopping for perfboard/protoboard, the only products I've found listed as RoHS are brand-name items, costing several times that of the generics.
Is perfboard/protoboard inherently free of lead, etc? Or should I pay up for the name-brand boards? (I work on project with my ch... |
H: Is it possible to create a homemade programmer for PIC16F84A?
Is this simple circuit able to program a microcontroller? Or Does it need any other components?
After looking at this question, I can know where D+ and D- of USB cable are, by looking at the colours of wires.
After reading datasheet, I think that D+ and... |
H: Define Pins For Use By a Library xc8
I've got some code i'd like to use in multiple projects so i'd like to put it into a library
The library will use no special features of the chip and whichever two pins it uses to do its job only have to be general I/O
As I plan to use this for multiple projects, these projects ... |
H: How to troubleshoot non-working RS232 to USB connection
I have bought a RS232 inclinometer and a FTDI USB to RS232 cable.
The inclinometer spec sheets states:
RS232 full duplex communiction
Supply voltage 4.9 - 15V
Wires:
Red: +ve
Blue: ground
Yellow: RS232 Tx
Green: RS232 Rx
The USB cable specs:
Supply volta... |
H: Logic value of a single input pin into a microcontroller
I'm trying to get the logic value from a node in a circuit (it is the output of a comparator that can either be 0V or 5V) into an AT89S51 microcontroller. My program just tries to get the value of pin P0.0 into the accumulator (considering that 5V would be 1)... |
H: What is the purpose of the Zener diode in this relay coil circuit?
It is clear that the ordinary diode is the usual flyback diode that dissipates the energy stored in the coil while it is turned off, but what could be the purpose of the Zener diode?
I think the main effect of it would be that a significant reverse ... |
H: Interfacing an old spectrometer with PySerial
I asked this question on the Engineering StackExchange and someone said it might be more appropriate here.
I want to interface an old Shimadzu spectrophotometer (Model UV-1601, manual here) through its RS-232C port, which is described in the manual in Fig. 12.2:
I wan... |
H: 5V, 50 Ω input single pulse signal to an FPGA
I have a 5 V, 50 Ω input single pulse signal (<1 ms pulse width) going into Trenz TE0711 (operating @3.3 V and 50 MHz clock). Since the input signal is too high of a voltage, I am trying to find a way to reduce the voltage and keep jitter low (<1 ns). I also want it to ... |
H: Fix for poorly designed class-D amplifier mute circuit
I recently made a PCB for a project with several class-D amplifier channels to drive small speakers for audio feedback. I included a mute switch which connected or disconnected one end of these speakers from ground. However, because all the negative terminals o... |
H: Altium Designer: Is it possible to detect PCB track router over cut in GND plane using DRC?
It is essential that high speed tracks have continuos ground plane with no cuts. This is essential to ensure signal integrity. That being said, can Altium designer use some sort of user defined design rules to check if a PCB... |
H: High reliability, automatic reset, enable switch
I am currently facing the issue that I am currently working on a subsystem for a high power industrial automation system. The panel of this subsystem consists of a lot of components, however here only a 3-position turn switch as well as a safety switch are relevant.
... |
H: Same net overlapping pads ok?
I'd like to keep the option between components with slightly different footprints. In this particular case it's tactile switches with either 6.5mm or 8mm distance between legs. It looks ok to me but I'm not sure if there are any contradictions. Are there?
Update, yeah it works.
AI: Th... |
H: What is the purpose of the R-divider in a String DAC?
I'm not sure if this is duplicate but a String DAC model is always shown as follows:
And R-divider is equal to the sum of the DAC resistors below it. And to compensate that a gain of 2 is used at the opmap.
But why not omitting the R-divider completely and use ... |
H: MOSFET transistor replacement for Proform T7 Treadmill
Treadmill motor turns for a second and immediately stops. After researching issue, looks to be a blown IRFP250M
IOR P039J 20 8J.
My question is, I'm having trouble finding a replacement that includes the numbers after the IRFP250M. Are those numbers important o... |
H: How to increase a mic output level?
I have an old lapel mic that outputs a signal that is way too small for most applications. In my attempts to learn electronics I started analyzing it and reading about the subjects. Still, I'm left with more questions than answers.
The first surprise to me was the way its circuit... |
H: White noise percussion resonating capacitor
I'm breadboarding an analog drum module from some 70s schematics. Experimenting with noise filtering, I've achieved a cool "resonating" sound but the result is a bit too noisy for professional recording.
The responsible is the 330nF capacitor to ground just before the pre... |
H: \$I_{DS}\$ with constant \$V_{DS}\$ but switching \$V_G\$
How will the IDS graph be when it has constant VDS (increasing to 800 V then being constant) and switching VG (like a square wave 12 V) in a 1200 V 134 A MOSFET?
I am trying to use the MOSFET with 1200 V 134 A in a buck converter (800 V to 400 V). How should... |
H: Controlling one relay with three LEDs - energize relay if any one of the three LEDs are lit
I have three 12V indicator LEDs which are the simplest way to see if one of the three circuits is 'ON'.
Only ONE of the LEDs can be ON at any given time. They all share GND and a controller sends POS to each, as it's activat... |
H: Question about my small solar panels
I have some small solar panels and I wanna build a project. My project includes the solar panels and a phone power bank that has input of 2 A. Right now I have the solar panels connected to each other but in a circuit that makes more Volts not Amperes. So the big white one has ... |
H: Question on "Parts should be used within 5 days after opening." statement on component shipping package
I've been given the task of verifying a batch of ICs from a chinese broker, to see that the chips the company has bought are what the broker claims they are. The package we've received looks like this, and has th... |
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