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How to dim Chinese ceiling led lights

I have purchased some very powerful work lamps (80w) that provide excellent light for working on very small parts. However for most of the time I don't need that much light and I am trying to figure ...
Broom Stick's user avatar
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0 answers
6 views

Dual edge triggered Bistable Multivibrator

Design a bistable multivibrator to increase the frequency at which the data is stored. When doing so, ensure that the data is stored at the rising and falling edge of the clock. However, due to lack ...
aditya arya's user avatar
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2 answers
44 views

Why is the MOSFET in this fan control circuit overheating?

I’ve designed a fan control circuit using an N-channel MOSFET (STN3NF06L.) The fan operates at 12V, and I’ve isolated the 12V side from the 3.3V microcontroller side using an optocoupler (ACPL-W314-...
Mayur Nath's user avatar
0 votes
1 answer
20 views

3-Phase system Voltage conversion

If we are converting from Y to delta configuration or vice-versa, how do we convert the phases of our voltages? I've seen that we need to add or subtract 30 degrees from one another, but I don't ...
Electricity's user avatar
1 vote
0 answers
11 views

IR Blaster Resistor Calculation for IR LED

We are trying to build IR Blaster based on schematics provided by Tuya. I believe Tuya based IR blasters sells hundred of thousands per month if not millions. So I am quite sure that there schematics ...
Gailu's user avatar
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1 vote
2 answers
46 views

What is the function of this resistor and capacitor at the input of optoisolator?

This "equivalent input circuit" shows a resistor and capacitor at the input of optoisolator (inside the red oval): Are they used just for modelling, or there are actual physical components ...
Paul Jurczak's user avatar
1 vote
1 answer
30 views

Trying to identify this chip and possibly its functionality?

Long story short is I applied too much voltage to my Smooth Stepper and I'm just trying to learn a little about it and possibly get lucky and fix it. I'm trying to identify the IC in the pic as I ...
user781675's user avatar
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0 answers
6 views

Can I use a large ESC controller with a mini BLDC motor? [closed]

I bought a HappyModel SE0802 19000KV Brushless motor for a project. I have a 30A 2S-4S BLHeli ESC controller. Is it possible to run the motor with this ESC controller?
Pratyush Manas's user avatar
1 vote
1 answer
27 views

ESD protection device selection

I want to select a ESD protection IC for my circuit with the following conditions: Battery based and ultra-low-power Battery voltage 3.6 V My sensitive chips inside my circuit has Absolute Maximum ...
Andromeda's user avatar
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2 answers
22 views

What are the VDDSD, VLXSD, and VFBSD pins?

On the STM32WB09KEV, and on MCUs in general, what do the VDDSD, VLXSD, and VFBSD pins mean. I can see that they have something to do with SMPS (input/output, ground and output), but what do they ...
YANNTASTIC5915's user avatar
0 votes
1 answer
36 views

Replacing the BJT in the current limiting circuit with a MOSFET

I was looking for a current limiting circuit and found an implementation using TL431 and a bipolar transistor. However, I did not have a bipolar transistor at hand for the required current and ...
Typeof undefined's user avatar
0 votes
2 answers
36 views

Verifying if HSE is used by MCU as system clock without probing

I have a PCB where I use an 8 MHz quartz resonator as this MCU's external system clock source. In STM32CubeIDE the setting is as follows: The program runs fine in MCU, but I cannot be sure if HSE is ...
cm64's user avatar
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0 votes
0 answers
7 views

plecs simulation of output impedance of switched capacitor(SC) converters

I am trying to simulate how output impedance of several DC/DC switched capacitor converters(dickson, ladder, and series-parallel) changes as switching frequency increases. I referred to several papers;...
user372587's user avatar
1 vote
2 answers
43 views

How to simulate for the Gain of opamp Bridge Differential Amplifier?

Hi experts, I have this circuit, with a bridge connected to an op-amp in differential form, and I want to simulate it for the Gain of the circuit in PSPICE. I have found it's gain by hand, which comes ...
Vibhav shivadeker's user avatar
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0 answers
24 views

Ebers Moll parameters for MPSA18 and AC128 BJT transistors

First of all, I should mention electronics is not my field so my problem might be trivial for you. I'm currently working on my thesis and I need to model two BJT transistors: NPN MPSA18 and PNP AC128. ...
Sebastian's user avatar
0 votes
0 answers
26 views

I2C Write Function and Making the Array User Inputtable with Python

I'm wrapping up the firmware for my project using 4 TCA9548As to switch between 32 different ports for I2C slave devices. I have a raspberry pi and clamp on master SDA and SCL lines for master input. ...
Beau Raley's user avatar
0 votes
0 answers
11 views

How to connect several sheet symbols with [x...y] stye ports to a bus?

I have two ADC units within my hierarchical design. Each ADC unit have 16 inputs which I made with ADC[0..15] sheet port. Is it even possible to use both units? Now ...
Roman Matveev's user avatar
2 votes
2 answers
42 views

Replacing USB-C socket on a keyboard

I decided to fix some of my stuff that has broken USB-C ports. (why are they so fragile!) I've removed the old sockets and cleaned the pads, but when the old sockets were damaged (by simply inserting ...
Haverford West's user avatar
-3 votes
0 answers
19 views

Troubleshooting of Emerson Jacking Soft Starter [closed]

The Soft starter is tripping and showing motor connection immediately it is put to run. I have checked the motor connection and the power connections on the control system but the error is still ...
ECR Inagha's user avatar
0 votes
3 answers
51 views

Filter on SEPIC architecture output for making +/- 60 V from 11 V input

I'm working on a LM5155 Boost/Flyback/SEPIC controller reference design PMP40488 from TI. The goal of the design is making variable output (maximum +/- 60 V) from 11 V input. My question is related to ...
Andromeda's user avatar
  • 491
0 votes
0 answers
24 views

Uninterruptible power supply for wireless equipment using cheap modules and cheap batteries

I've built an uninterruptible power supply (UPS) to use in my house during power outages that last for 16-18 hours per day. The idea was to use previously bought cheap modules from Aliexpress and old ...
Zero Cool's user avatar
1 vote
0 answers
19 views

Cannot decode IR signals using IRRemote Library

I'm using RC5 encoding for my project. I'm sending signals using RC5 Protocol. The transmitter is sending the signals correctly. But on the receiver node, when I decode the signals, Library is unable ...
Tauseef_Ahmed's user avatar
1 vote
0 answers
33 views

Debugger/Programmer Invalid Target Device

I use a PicKit5 to program a PIC24EP128MC202 using MPLAB x IDE v6.20 with XC16 Compiler, I recently fixed some memory model issues and I ran into this problem where "Invalid Target Device" ...
I have no enemies's user avatar
0 votes
0 answers
32 views

Nanogrid management PCB review

I have made some progress on the PCB for a nanogrid consisting of solar panel, wind turbine, batteries, load (not yet connected) this board monitors the current/voltage of each components and sends ...
Knowledge Seeker's user avatar
1 vote
1 answer
44 views

STM32 MCU doesn't reset after flash

I'm using STM32CubeProgrammer to flash an MCU. But after flash completes, to reset and run the MCU I have to interact with NRST pin by a push button. Is there a way that right after the flash the MCU ...
cm64's user avatar
  • 2,217
0 votes
2 answers
75 views

What is the role for each of these AC coupling components?

I'd like to learn more about the RP2040 PWM Audio AC coupling circuit found in figure 22 in this document. Figure 22. Schematic section showing the Analogue PWM audio circuit Even though I understand ...
Erik's user avatar
  • 101
1 vote
0 answers
47 views

Why does this push-pull converter fail?

Consider the following circuit of a push-pull converter. I would be interested to learn why you think it fails (MOSFET and controller). The controller is a UCC28084. The MOSFETs are SSM3K361R (i.e. ...
tobalt's user avatar
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1 vote
1 answer
26 views

PIC24 memory model problem error

I attempted to run a code to start understanding how PIC24 works but I run into a memory model problem. I don't understand what's his optimization issue since I have enough space to write it on, and ...
I have no enemies's user avatar
0 votes
1 answer
66 views

Constant output voltage in buck-boost converters

I'm a self-taught student. I'm trying to understand the working principle of buck-boost converters in continous conduction mode. When the switch is turned on, the equation describing the inductor is ...
Luke__'s user avatar
  • 309
0 votes
1 answer
30 views

Part number of this IC marking "44t" - Identification

Please help me define the IC marking "44t" in the picture below.
Bang Duong's user avatar
1 vote
1 answer
34 views

Is there a simple approximation for B-field strength of a loop antenna when driven at 10 GHz?

I have a near-field loop antenna that I'm applying a microwave field to at 10 GHz. I'd like to have it interact with a small magnet that is much smaller than the loop. Here's a picture with the little ...
Steven Sagona's user avatar
0 votes
1 answer
26 views

Audio Codec Input/Output Channel Stages

I am planning to build a PCB for a Eurorack Modular Synthesizer, incorporating an STM32 for DSP and a bidirectional Audio Codec like the TLV320AIC3104 to handle the ADC/DAC. Eurorack audio signals ...
95lux's user avatar
  • 1
4 votes
1 answer
183 views

How to connect to "upstands" on the PCB without soldering?

I've got two items of the same model number, but one of them has a Phoenix type terminal on the PCB for the connection. See photo below. The other one has "upstands" poking out of the PCB. ...
user27511's user avatar
  • 601
2 votes
2 answers
49 views

4N25 Optocoupler design

Below is a simple 4N25 optocoupler circuit that I designed in LTspice. 10 mA is flowing through the input. It works in saturation. According to the datasheet in Figure 2 (CTR-sat), it says 0.7, so the ...
Mhan's user avatar
  • 377
0 votes
2 answers
46 views

Active Bandpass with "Tunable" F Using Potentiometer

I'm trying to construct a simple bandpass filter circuit using the multiple feedback topology with one op-amp (I'd like to leave out a dual-opamp approach for now). I'd like the center frequency to be ...
Nils L's user avatar
  • 103
0 votes
1 answer
28 views

Part number of this IC marking "R2. 8"

Can anyone please help me define the part number of this part marking "R2. 8" in the picture below?
Bang Duong's user avatar
0 votes
1 answer
38 views

Accumulate load time and retain through a power cut?

I have a question around closing a relay after a load been active for a specific elapsed time; and the time is always known even through a total power cut; ideally din rail components would be able to ...
Anthony1256's user avatar
0 votes
1 answer
21 views

EAGLECAD Create a device with one mulit-instance package

I need to create some switches as devices. The switches consists, from the PCB-side of view, only of a bunch of ST2,8 connectors. These are based on the connectors within the existing con-rib.lib. To ...
Benny's user avatar
  • 1
0 votes
1 answer
50 views

Non contact AC voltage detector circuit current calculation

This seems to be a common circuit for a non-contact AC voltage detector: Non-Contact AC Line Detector using BC547 The probe generates a small amount of current when it is near an AC line due to ...
Kailash Kumaravel's user avatar
-3 votes
2 answers
61 views

Multimeter fuse [closed]

Hello guys my multimeter has no fuse or no fuse to put into it where can i put my fuse ?
prince gamer_61 playz's user avatar
1 vote
0 answers
38 views

What's the deal with this comparator's hysteresis?

I have here a circuit designed by someone else to create a 50% duty cycle square wave that leads a current transformer in phase. The CT maxes out at about 1 amp, and the output of the phase-leading ...
theseventhsu's user avatar
0 votes
0 answers
35 views

ICs for Low Voltage Analog to Digital Conversion [closed]

I'm looking for an ADC IC that works in very low voltage ranges (0 - 50mV), and with a resolution of at least 1024 steps. I was wondering if anyone knew if this sort of device even existed, or what a ...
Random Studios's user avatar
0 votes
0 answers
26 views

How do I decompose 6 or more variable truth table to groups of 4 or 3 variable truth table and K-map them and combine the equations?

K-maps are a go to method of finding SOP/POS form for truth tables of up to 4 variables, beyond that the K-maps become explosively complex to manually draw and solve. Is it possible that for 6 bit ...
lousycoder's user avatar
0 votes
4 answers
128 views

How do I light an LED on a ground signal when I don't have enough voltage left after the PNP?

I am working with a circuit that grounds when a LED is to turn on. I have an 8V supply voltage for the LED, which cannot exceed 10mA. The signal to turn on the light is a very weak 6.5V, so Vbe is ...
KJ7LNW's user avatar
  • 2,056
0 votes
1 answer
33 views

Injecting bits to a parallel communication bus possible?

Antennas can recieve data (bits) because RF signals induce an analog signal into it in a serial format, essentially a voltage that varies over time. My question is can we have an antenna that can ...
19216811's user avatar
0 votes
0 answers
27 views

Analog pulse width detection [closed]

I have to make an analog circuit that the input is a pwm, when the pulse width is 1000ms the output must be 0 and when the pulse width is 750ms the output must be 1, i tried using an 555 with a ...
Rodrigo Vernizzi's user avatar
0 votes
1 answer
26 views

Can a voltage higher than LED maximum be used when using constant-current LED driver?

I am planning to use these components: TLC59283 CREE J Series 5630 LEDs Specifically, I want to create a setup like Figure 9-1 on pg. 22 of the TLC59283 datasheet. Currently, I am trying to choose a ...
JustHeavy's user avatar
  • 301
2 votes
0 answers
47 views

Confusion with two types of differential signal coupling

I'm having difficulty to articulate the question. But perhaps I might get close to it by an example. I know that in differential signaling, both the signal and the receiving amplifier can be in ...
user1245's user avatar
  • 4,333
0 votes
1 answer
59 views

How can i make this idea work in PCB?

Assume i have a source of energy (voltage source), i want to sense the voltage and current of this source and transfer this analog information to an ADC (arduino nano) thus i have to make the voltage/...
Knowledge Seeker's user avatar
1 vote
2 answers
77 views

Is the x-capacitor essential in the circuit below?

hi I hear a buzzing noise from c1 and L1 in this circuit C1 used a film capacitor, not an X capacitor (Film capacitors were used instead of x capacitors because of internal space problems.) I thought ...
 8  minikhh's user avatar

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