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SPI Data Transfer to 74HC596

I want to send data to my 74HC595 via SPI (in Arduino). But I could not manage to blink my LEDs. My code is in below. ...
TechnoLover's user avatar
1 vote
0 answers
15 views

Inverter interharmonic in simulation? Is this typical? Unstable at ~50ms mark?

I am trying to learn about inverter design, and I am simulating a basic sinusoidal PWM controlled, 3ph inverter on PSIM, the load has a PF~0.9 and the switches are ideal in the inverter. I had a few ...
Paul's user avatar
  • 75
0 votes
0 answers
35 views

How does this delay circuit works?

Just wondering if there is an explanation to how this "delay circuit" works? (Above screenshot from YouTube video "Fun with Transistors" at timestamp 716s (11m 56s) by HackMeMod) ...
Dip773's user avatar
  • 1
-2 votes
0 answers
23 views

Why should VS always be larger than VIH? [closed]

Why is VS always larger than VIH? What are possible issues?
Kimberly Perez's user avatar
0 votes
1 answer
28 views

LT6268-10 OpAmp Noise

Following on from my previous post , I printed the circuit as below however getting very noisy signal. what am I doing wrong here?
LifeIsBeatiful's user avatar
0 votes
1 answer
32 views

power supply with max current in pcb

I'm new to electronics and I have a question. I have a component on my board that requires 4 volts and 2 amps, and I need 5 volts for other devices. Should I use an adapter, or should I use something ...
eskandari's user avatar
0 votes
1 answer
41 views

Are perfboard, stripboard, and matrix board essentially the same thing?

Are the terms perfboard, matrix board and stripboard referring essentially to the same thing since they are often used interchangeably?
Rob Kam's user avatar
  • 1,384
0 votes
1 answer
37 views

Should I add the female pin headers to my KiCad PCB design?

I created a KiCad PBC design for my circuit: The actual thing has (machined) female pin headers (and the ESP32-C3 and HX711 go on top of them): I think the printed result will be the same whether or ...
wyc's user avatar
  • 287
1 vote
3 answers
54 views

What are the hole dimensions for 0.1" pitch headers?

What are the hole dimensions for 0.1" pitch headers? As discussed in How to breadboard with large lead components (such as TO-220)?, holes on standard 0.1" pitch headers are: Rectangular (...
SRobertJames's user avatar
  • 1,175
0 votes
1 answer
54 views

Possible GND Conflicts in My PCB

I have the following schematic as the verification and validation setup for our DC-DC converter: The idea is that by using a DAC, we can manipulate the output voltage. We plan to send commands to the ...
Andromeda's user avatar
  • 657
0 votes
0 answers
17 views

Why do we need phase tag in completion queue? [closed]

Please refer to this image: I have been reading the NVME spec and had a problem with the working of phase tag. Lets assume that we have a completion queue(CQ) of size 8. Initially the phase tag of ...
S Drop's user avatar
  • 1
0 votes
0 answers
16 views

Analyzing hardware design in vivado [closed]

I have made a tiny design for a finite state machine expressed as VHDL. Now I wish to somehow profile it. ie, to see how good/bad the design is. How is this usually done in the hardware world? I am ...
J...S's user avatar
  • 101
3 votes
3 answers
61 views

How to breadboard with large lead components (such as TO-220)?

What type of connector, terminal block, header, or socket can plug into a breadboard on one side and accept large lead components (such as a TO-220, lead is 0.05" wide)? Background Breadboards ...
SRobertJames's user avatar
  • 1,175
1 vote
1 answer
53 views

PUT relaxation oscillator problems

While trying to learn more about electronics and oscillators, I encountered the following post on this forum PUT relaxation oscillator doesn't work. I decided that I would build the circuit which &...
balu's user avatar
  • 65
0 votes
1 answer
26 views

Replace the Atmega16U2 on the ArduinoMega2560 with Arduino ISP programmer?

I'm working on a custom ArduinoMega2560 and I was wondering if I could replace the 16U2 with the Arduino ISP https://docs.arduino.cc/retired/boards/arduino-isp/ (it's cheaper and simpler). Does this ...
Tristan's user avatar
-1 votes
0 answers
49 views

What do the pins on this audio amplifier PCB mean? What I would need to connect to them to get my speaker working? [closed]

Running down the upper left corner are all the pins that go in and out of the board. I'm still a novice at things like this and I would like some help identifying what each pin is for and to what it ...
Lexi Mcvay's user avatar
-3 votes
1 answer
64 views

IEC 62052-11 Heating test, what does it mean 25 K?

In IEC 62052-11, Heating test, describe as below, 7.2 Heating Under rated operating conditions, electrical circuits and insulation shall not reach a temperature which might adversely affect the ...
user395338's user avatar
0 votes
1 answer
52 views

2-stages TEC1-12706, heats instead of cool [closed]

I have the following setup: 2 TEC1-12706 stacked with hot side up and cold side down. I cool the hot side with a big heatsink and the cold side with water cooling. All system is clamped with 6 screws ...
Alberto's user avatar
0 votes
3 answers
55 views

How would this circuit work with a directly heated cathode?

I am looking at designs for vacuum-tube LC oscillators, and have settled on a Colpitts configuration(only one inductor needed). However, looking at the design below from this website, it uses an ...
lemon's user avatar
  • 614
0 votes
1 answer
49 views

ADC Design Help [closed]

I am planning to design a new ADC but I have not designed an ADC before. I will read at 10uV level. I am thinking of using a high resolution ADC, and also MCU I am open to suggestions on this subject. ...
AEY's user avatar
  • 59
0 votes
0 answers
50 views

Kicad 8: why do reference and value sometimes rotate with 'R' and sometimes not?

I am quite new to KiCAD, but I noticed that in the Schematic Editor keyboard 'R' sometimes rotates the symbol without rotating the text and sometimes rotates the text with it. What causes it? Is there ...
Mark's user avatar
  • 63
-1 votes
3 answers
59 views

Do the batteries connected in series drain faster than batteries connected in parallel? [closed]

See the following two circuits. The batteries are identical and also the consumer (LED in this case, but we can consider others). We know the series circuit provides double the voltage compared to the ...
Marius D's user avatar
0 votes
1 answer
51 views

Why is the output impedance of an open-loop amplifier with a loading effect calculated by breaking the loop like this?

I'm a bit confused about how the author calculated the output impedance of the open-loop transconductance amplifier with the loading effect as follows. (All images are taken from of the 6th edition of ...
hana's user avatar
  • 292
-2 votes
0 answers
40 views

I'd like to ask you a question to solve the star fever problem [closed]

I made a visual aid device, but when I use the device, the heat rises little by little, so if I keep using it, the device gets hot, so how can I solve this problem? It is difficult to change the ...
김강준's user avatar
-1 votes
3 answers
85 views

Cheap and easy way to make halogen bulb last longer

I have a dozen security guards that use 12v 100 watt halogen spotlights connected to 12 V batteries to do patrols on the ocean. Let acid batteries had all kinds of problems and I switch to lithium. ...
SV Savannah's user avatar
0 votes
1 answer
41 views

How do you replace a flex cable soldered directly to the PCB?

Good evening, everyone. I am looking for advice and hope you can help me. I am repairing a PCB (first photo), but the white flex cable with 12 pins spaced 0.5mm apart was directly soldered to the ...
condor12's user avatar
  • 145
0 votes
1 answer
39 views

Convert binary number in flip-flop for use with mux select lines?

If there is a binary number stored in a flip flop register how can I convert this into a single positional bit in another flip flop register? For instance if the number is 11b or decimal 3, I want to ...
notaorb's user avatar
  • 117
0 votes
0 answers
46 views

Active GPS Antenna Power Requirements [closed]

I need some guidance on active GPS integrated circuit power requirements. I am 99% certain L3 Harris radio is giving me a line of BS. We have a fleet of several thousand P25 UHF mobile radios with a ...
Dereck's user avatar
  • 652
0 votes
1 answer
28 views

Wires branching in parallel with lipo battery and how would the current behave

If I have a 45C, 1.8Ah lipo battery (81A?) that I want to connect to a constant current driver that can only take up to 10A, would it be possible to use 8 wire branches (with no components) in ...
John P's user avatar
  • 1
3 votes
1 answer
176 views

LT6268-10 Opamp Oscillation and Offset

Below is my Photodiode-OpAmp circuit that is configured as Transimpedance Amplifier. When I put both inverting and non inverting into ground, no signal is coming out. However when I connect ...
LifeIsBeatiful's user avatar
1 vote
1 answer
73 views

How do you use interrupts with push buttons on PIC?

I am trying to create a simple application to get the idea of interrupts down and eventually use it for a project that requires a HFINTOSC. I made a flashing LED. I want the microcontroller to start ...
xcaliber99's user avatar
0 votes
2 answers
39 views

I need to prevent a small quantity of water from freezing using a solid state controller circuit

I am currently using a 10W resistive heater element powered by a 5V 2A DC power supply, which works fine, but is unsatisfactory since it's either on (plugged in) or off (unplugged) making it subject ...
Bob Baker's user avatar
0 votes
0 answers
18 views

Load cycler keeps stalling at same voltage

Hello I am building a load cycler using an arduino with this code: ...
risa's user avatar
  • 13
0 votes
0 answers
30 views

Best PCB design techniques regarding signals in micro/nano amps?

I have a design where I am measuring square waves of currents in the order of microamps, specifically 100nA to 200uA (trace 1). I also have a triangle wave on the same board running at 1kHz, 10Vp-p (...
Noahwar97's user avatar
0 votes
0 answers
27 views

Hi my TP4056 randomly shutdown output?

I bought the 18650 TP4056 Micro SET. I connected the WSP32 cam via USB, and after 1 or 2 minutes it turns off and again and again. Can someone help me? Battery: LiPo 3.7 V, 1050 mAh (from headset).
Michał Cerek's user avatar
0 votes
1 answer
43 views

Bandwidth measured is two orders of magntiude less than expected TIA circuit

I have the following photodiode schematic, all soldered onto a small PCB. The first stage is a TIA, and the second stage filters out high frequency signals. The calculated bandwidth of the circuit ...
Collin Fan's user avatar
0 votes
3 answers
52 views

How can one voltage value have multiple SOC? (Jackery Blog Graph)

https://www.jackery.com/blogs/knowledge/lithium-ion-battery-voltage-chart This is a typical voltage discharge curve for a li-ion battery. I am wondering how one voltage value can translate to multiple ...
risa's user avatar
  • 13
0 votes
2 answers
25 views

Can I power an AMS1117 5V to 3.3V module with a 9V input?

I'm working on a project where I need to power an ESP-01, which operates at 3.3V. Currently, I'm using a 9V battery as my power source. To step down the voltage, I have an AMS1117 5V to 3.3V module. ...
Miguel Zabala's user avatar
1 vote
0 answers
55 views

PIC Schematic File Format

I'm trying to open some quite old schematics (I think around 1989) that have the file extension ".pic" and am stuck as to how to read that. They're not PIC files from PCPaint although they ...
nxe's user avatar
  • 111
0 votes
0 answers
46 views

I2C: Regulator returns different values upstream and downstream of switch

I'm trying to use an Aardvark I2C controller over the SMBUS_TEST1 header on an ASRock IMB-A8000 motherboard to read voltage and current from an RT3674AE regulator. I don't have a schematic for the ...
olishmollie's user avatar
0 votes
3 answers
84 views

What components do these symbols represent in this schematic

Regarding this IC, What are the two triangular components the SIG IN(pin 14) is coupled to? First one is a triangle with a circle and a resistor like thing(?) in parallel to it, and it follows a usual ...
pnatk's user avatar
  • 1,468
-1 votes
0 answers
20 views

How can I increase the volume of this video intercom device? [closed]

I recently moved and the video intercom device is faulty. Given building conditions a repair cannot be performed and my device rings and sounds at a very low volume. I have to be at a meter's distance ...
Sergio Basurco's user avatar
0 votes
1 answer
47 views

Op-Amp for microelectrodes in PBS conductive solution

I am using micro electrodes in a conductive solution (PBS: Phosphate Buffered Saline) and I would like to be able to measure the voltage with a National Instrument measuring device (PXIe6345). I apply ...
Jad Rabhi's user avatar
4 votes
1 answer
484 views

High frequency digital (2GHz+) and PCB manufacturability with FR4?

I have done many designs below 2GHz but am now needing to go beyond that to 3GHz. The PCB's need to be able to support MIPI CSI and LPDDR5 signaling. Can I use run of the mill FR4 or do I need to '...
Voltage Spike's user avatar
  • 85k
0 votes
1 answer
27 views

How do I Program the MSP430FR2433 LaunchPad using the MSP-FET?

The below diagram shows the setup for the 2-wire JTAG (that is what I am trying to use). I tried this, and it is not working. What connections do I need to make between the MSP430 and the MSP-FET? ...
RGB Engineer's user avatar
-2 votes
2 answers
48 views

Can two different signal PCB tracks on the same layer(eg. MOSI crosses MISO) overlap or is this identical to connecting two wires together? [closed]

I'm working on my first PCB and it's fairly large and doesn't have much room. Any help is appreciated!
Michael Bradley's user avatar
0 votes
0 answers
12 views

STM32 TAMP REG Debugger clearing

I'm using an STM32L4P5, which has TAMP registers in the backup domain. For some reason, every time I reconnect or power off/reconnect the debugger to the device, the tamp registers are clearing. Is ...
Erik Friesen's user avatar
  • 1,963
0 votes
0 answers
34 views

Input bulk cap of a flyback converter

Doing calculation for input bulk capacitor of a flyback converter. Have attached my calcultions. Also used Ti calculator. Why am I getting different values? What am I doing wrong? And how to do the ...
rachit juthani's user avatar
1 vote
0 answers
17 views

Why does post-synthesis propagation delay vary for the exact same LUT6 primitive, with the same I2_O path and same fan-out?

Please consider the last two Prop_LUT6_I2_O logic delays above at 90ps and 32ps respectively. Why does the timing-model for the same I2_O LUT path have such high variance, and ideas? Even the net-...
yhtroom's user avatar
  • 11
0 votes
1 answer
22 views

DS1110S delay line output signal working

There is a component called DS1110S datasheet attached. Given 0-3.3V pulse input and Vcc=5V. How can I know the delayed output signal amplitude? Is it 0-3.3 like the input or 0-5V? The Voh data in ...
scot123's user avatar
  • 23

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