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votes
1answer
22 views

TF-Mini S lidar not sending any serial data

I have a TF-Mini S Lidar. I have hooked it up to my arduino like so: (Above image from learn.sparkfun.com) And have uploaded this code to the arduino board: ...
0
votes
3answers
68 views

What's the name of this electrical connector?

What's the name of this electrical connector?
0
votes
0answers
22 views

explanation of DC ceiling fan motor and hum and noise [duplicate]

I asked a while back why does a ~$150 120vac electric ceiling fan, above my bed at home, hum and agitate me. what also agitates me is i provide background information and I thought I was pretty clear, ...
1
vote
3answers
65 views

How does the Colpitts oscillator provide positive feedback?

This is a Colpitts oscillator in a common-emitter configuration: For oscillation to occur, there must be a positive feedback. But I'm confused how can this oscillator provide a 360° degree turn for ...
0
votes
0answers
9 views

How can I boost the voltage of a headphone output signal to use with “aux in” on car radio?

I'm frustrated by the fact that I always have to crank to volume to max in order to utilize "aux in" ports on things like my car stereo when sourced from a smart phone or PC. It seems that ...
0
votes
1answer
27 views

Why did the designer of this flyback circuit choose to set the oscillation frequency as high as possible with the smallest resistor tolerated?

This circuit uses a current mode controller with an oscillation frequency response of: In the circuit, the designer chose to use a 10nF cap, with a 680 ohm timing resistor, which according to the ...
0
votes
1answer
26 views

Saftey regulations of multiple 1mW lasers

AFAIK devices containing exposed 5mW lasers are illegal without a license, but those containing 1mW lasers are. But how about a device with ten 1mW lasers? Is it still a safe and legal device? The ...
0
votes
1answer
34 views

Powering the blue pill board from laptop and using another power supply at the same time, will this cause problems?

The components: a laptop, a blue pill board, a +5V power supply(taken from old PC). I have a blue pill board(stm32f103c8t6 mcu). Schematic here. I connect my laptop to the blue pill board via SWD ...
1
vote
2answers
111 views

Converting 400 to 500 mV signal to 0 to 10 V PWM signal

I want to make a driver board for piezo mist maker which requires 10V 1.7MHz signal. So far I have created a signal of 1.7MHz and 0.4 to 0.5V (picture link added) with a crystal oscillator and 2 PNP ...
1
vote
1answer
22 views

How can I reattach tiny wires to a tiny circuit board? [closed]

These power supply wires broke off due to my carelessness. How can I reattach them without soldering?
0
votes
0answers
15 views

Can a thyristor regain its forward/reverse blocking capability if the current through it is “instantly” brought to zero?

I am imagining a situation where we have several series-connected thyristors, say 10, each that can block a voltage of 100V. So, the ten series-connected thyristors together can block a total voltage ...
0
votes
2answers
191 views

Measurement of s11 with reduced power on NanoVNA

I am developing a 10.7 MHz IF amplifier for a radio receiver. In order to match the input to the output of the driving mixer stage (330 ohm) I need to measure the input impedance. I did the ...
1
vote
1answer
34 views

(Ideal) detector diode circuit becomes more sensitive with lower saturation current? Simulation wanted!

Application note 969 shows that a detector diode has in general higher sensitivity for lower saturation current. The voltage sensitivity at zero bias is derived as: gamma = Vout/Pin = 0.52/Is, which ...
4
votes
6answers
1k views

Can an EEPROM be one-time-programmable?

I'm confused, and I hope you can help me figuring out, what I misunderstood. I am not an electronics engineer, so bear with me :) I have a chip, from the engine control unit of a Toyota Yaris Verso ...
2
votes
3answers
2k views

Explain why the NodeMCU auto-program circuit would be useful

I'm looking at the NodeMCU "auto-program" circuit but could not understand why it is there at all. From my point of view, this circuit enables open-collector outputs, but makes programming dependent ...
3
votes
1answer
45 views

What prevents the lead attached to a semiconductor from forming Shottky junction

What prevents lead attached to a piece of semiconductor (for example in BJTs and FETs) from forming a Shottky junction?
2
votes
1answer
36 views

Need Help Creating SATA Power Cable for Lenovo C540 AiO

I need expert help. I have an old Lenovo C540 AiO desktop that I am trying to salvage. This model is prone to a failure in the SATA power cable, at the HDD connector end. I have found video guides on ...
9
votes
1answer
2k views

Is C0G a synonym for NP0?

This question is in the context of a production environment where part numbers and change notices are strictly controlled, and any alternate manufacturer parts under an internal part number must be ...
0
votes
3answers
62 views

How can i make a frequency dependent switch?

Is it possible to make a circuit/switch that turns a relay ON whenever there is a certain RF frequency applied and keeps it OFF for all other frequencies. The RF signal should not carry any ...
1
vote
2answers
33 views

Identify molex connector

Anyone know what kind of connector is this?The female connector size is around 18x7 millimeters
-1
votes
1answer
42 views

Use capacitor as keep-alive for alarm clock [closed]

I would like to integrate a capacitor onto the power supply of an alarm clock to prevent the flashing "12:00". Which would be the best way to implement?
1
vote
1answer
212 views

HDMI/USB Powered Lighting

Alright so a little vague title but here it goes. I'm interested in powering some 5v LED strips with an HDMI cable. I have no idea if this is even possible, I'm lacking knowledge in electronics. My ...
0
votes
2answers
42 views

Recieving and processsing array of data on STM32

I am trying to use RealTerm to send a .txt file containing a 10X10 array of data to my STM32 NUCLEO board using UART. So far I have been using HAL_UART_Receive_DMA and I have been able to store simple ...
0
votes
1answer
25 views

E/I inductive position transducer sensing device operation

so I have been doing some research on AC servo position flight control surface systems an was trying to find the component used to set the pilot's input command. Found out that a E/I inductive ...
0
votes
2answers
32 views

XR2206 Function Generator Kit on LM2917N-14

Please forgive my bad language I make Vehicle Speed Indicator with LM2917N-14. I tried it with cheap XR2206 Function Generator and NE555 Variable Square Wave. With NE555 LM2917 working properly, the ...
0
votes
1answer
67 views

Operation of a 2 phase servo motorin flight control surfaces

So after doing some research, I briefly know a 2 phase servo motor's operation. I know it has a control and a main winding that is 90 degrees phase different to generate a rotational torque. It also ...
1
vote
1answer
51 views

PIC10F206 MPLAB X IDE v5.40 - Light a LED

I am trying to light a LED with a PIC10F206, a PICkit4, the IDE MPLAB X IDE v5.40, and the pic-as Assembler. This is what I tried: ...
0
votes
1answer
38 views

Ferrite core StepUP Transformer Design

So, I want to make a High-Frequency Ferrite transformer that can convert my 150-volt peak Square wave into 100000 Volt Peak. I am using UUR6440 Ferrite Core. Material is CF139 https://www....
0
votes
0answers
31 views

How can i protect N-MOSFET from failing

i have made simple inverter circuit with z44 MOSFET but circuit work for minutes and the primary coil start heating then shorting finally damage the MOSFETF, it is my 6th time facing this issue. i ...
2
votes
0answers
85 views

FET H-bridge has slow convergence for the last 10% of output voltage: why? (DRV8874)

I have a board with 9x DRV8874, as described in another unrelated thread there. The driver switches fast to 90% of VM when ON (0V when OFF) then converges slowly to the final value (time constant~=...
1
vote
1answer
1k views

Lithium ion battery protection IC not able to drive MOSFET

I have integrated the TP4056 charger design into my PCB. The problem is that when I connect the battery at the battery terminals, I am not able to get the voltage at its output pin. The circuit can be ...
11
votes
7answers
10k views

No components 3D view in KiCAD

I'm just starting to work with KiCAD. One of the video tutorial shows that 3D view should incorporate components placed on the board: However in my case I can see only the board with pads: Looks ...
0
votes
1answer
23 views

How to compute Rth for this circuit using OrCAD PSpice

Take a look at this circuit The question asks to find Rth and Vth between a-b terminals. Hand calculation yields Rth=3.857 and Vth=4V. With OrCAD, the result is shown below using Bias Point ...
1
vote
2answers
802 views

Max length of extension cord for a 5kW load on 240?

So we have a 5kW generator for our film set. We need to get it as far away from the set as possible. As well as leave the option for 25m consumer extension cord for lights and haze machines. So what ...
0
votes
1answer
72 views

How to choose nodes for Thevenin equivalent circuit

I would like to know how do we choose the nodes for a Thevenin Equivalent Circuit. For example, in the voltage divider, we compute the Thevenin equivalent circuit between the nodes where we would ...
0
votes
1answer
40 views

Do I need to suppress ringing in a flyback converter?

I am about to design a flyback converter. As all flybacks with no extra measures it has some ringing. You can see that ringing in this example from -1µs to 4µs: This ringing can be surpressed by a ...
1
vote
0answers
41 views

Schmitt trigger output waveform coming as sinewave

I am new to Proteus. I tried simulating an easy circuit which was a Schmitt trigger using an op-amp. After simulation, the output waveform was an sinewave instead of rectangular wave. Any idea where I ...
0
votes
1answer
36 views

FET electrode convention?

Are there any conventions that allow one to tell which electrode is source and which one is drain?
0
votes
2answers
562 views

Transistors as switch and amplifier to control LED strip

I am controlling an LED strip based on audio input from my phone. I am having some good results, but not exactly what I want, and my ignorance of transistors is holding me back. (I'm a mechanial ...
-2
votes
0answers
27 views

2 Phase servo motor operation

Can somebody explain to me how 2 phase servo motors move loads? Have researched online but all explanations are very brief, a main winding connected to an AC source, a control winding with variable AC ...
1
vote
1answer
22 views

MPU9250 IMU wearable design considerations and device address problem

I need to use 12-16 mpu9250 IMU for wearable design. Each IMU will be placed different places on the body. Therefore, I want to read data from each device by using I2C interface. However, problem is ...
-2
votes
0answers
61 views

Headphone ground wires only work when connected tip to tip?

I am trying to connect my broken headphone wires. When i connect the signals wires, i twist them together and they work. But when i connect the ground wires, there is no sound unless i connect the ...
0
votes
2answers
71 views

How to make sure this oscillator will be stable?

In my textbook, the Wien-Bridge oscillator and the Twin-T oscillator needs a tungsten lamp as the self-adjusting resistance: The lead-lag circuit connected to noninverting input has a gain of 1/3 on ...
0
votes
0answers
22 views

Low Power Toroidal Conductivity Sensor Inconsistent Values

I have been trying to build a low power toroidal liquid conductivity sensor using the principle given in this image. This link has more information about the principle behind the sensor. What I have ...
0
votes
1answer
36 views

Linear regulator with tab at ground

I am searching for a linear regulator with tab connected to GND instead of Vout because it would be easier for thermal management. Unfortunately, all linear regulators seem to have their tab connected ...
0
votes
2answers
52 views

Confusion in current calculation

I'm confused about two different approaches for current calculation through a 5 ohm resistor. The 5 ohm resistor is in parallel with a voltage source so the current through it should be 2 amperes. ...
2
votes
2answers
867 views

Diode transistor circuit logic

So I've been doing some reseach on DTL ( Diode Transistor Logic ) and started doing some problems, but the problem i stumbled onto gives me some headache. The actual problem given is Given a DTL ...
0
votes
1answer
37 views

4 layer buck converter layout

What is the standard layout for a 4 layer PCB that everyone follows for a buck converter or similar? I was planning to go like this: Signal Vcc GND Signal Since inductors and FETS are noisiest of ...
0
votes
2answers
50 views

Logic buffer design

Logic buffer is usually depicted like this: But can this work equally well? And if it's not the case, why not?
1
vote
2answers
58 views

Opto-isolation amplifier output is too off

(As a follow-up to an earlier question answered by the community - thanks!) So I've got the test circuit setup using the HCPL 7520 (datasheet) now and planning to use an Arduino Uno to measure the ...

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