help

I'm pretty newbie. i designed a boost converter as hobby and need some help about that. not sure if it will work. how can i fix or improve the circuit. i aimed 5 Vin and 15V 10A max out and use 555 for generate pwm signal for mosfets. But i know 555 can generate max %50 duty cycle and it means i...

I found a blog that shows how to build a digital clock using ICs cd4060 and cd4026. https://danyk.cz/hodiny_en.html This is the site. I have checked if my ICs are working and they are. The only output I'm getting is the every 7 segment display shows 0 and the the two decimal points blink every...

I have watched recently this video: At the end of it he describe a way to make edge detector by using capacitor and resistor. The thing is i don't see it being discharged in any way. Would't it make it impossible to charge again and in consequence make current flow through the resistor and make...

Im trying to put a bcd input into a 7 segement display, but as it only shows the numbers 4 to 8 correctly, in all other numbers all of the segments are on, does anyone knows why? you can see the binary input on the right video...

Hello, I am new to building electrical devices, I am in the middle of building a power supply and found this as my output signal. Any Speculation would be appreciated. Thank you.

So i pulled this antenna cable off a tad to willy nilly whilst disassembling to repair something else and it's broken the very tiny u.lf or similar connector. I know I shouldn't have, but here we are anyway, no way back now. It looks to me like the pads are still intact underneath half of...

Hey everyone, I recently enrolled in a computer science major, and one of the subjects has to do with circuits, memory, the cpu, logic gates etc. The problem is, I have absolutely 0 experience on such things, and now with covid and learning from home I haven't really grasped much of my...

Hello, I have been making circuits as a hobby for 2 years now mainly focusing on trying to make a coil gun, and tried and failed 7 times now, and I am in desperate need of help with the circuit, if you see anything wrong with my diagram please respond as soon as possible. I bought most of the...

Hello everyone, I have taken a circuit from breadboard to PCB and I am having some issues with a few components. The device is a power controller designed to monitor 2 batteries. 1 battery is a backup battery and the other is the main battery. The main battery is also a starting battery for an...

Good morning all Iv had a bit of an idea and just wondering if there is anything out there or something similar as I'm not any good with coding. Iv build my son a basic gaming pc and he would like rgb but the mother board doesn't have a argb header, and I was wondering if a controller could...

Detailed description and website link are below. Parameter: 1>.Product Name: pWM 4-Wire Fan Temperature Controller 2>.Work Voltage: DC 11V~55V 3>.Work Current: 0.1A(MAX) 4>.Fan Current: 5A(MAX) 5>.PWM Range: 5%~100% or 0% 6>.PWM Frequency: 20KHz/2.5KHz 7>.PWM Signal Amplitude...

Hi I have a design requirement and are having an issue of designing a method to achieve it I have resistive elements that change with temperature and generally start with slightly different resistances in any case, what i need to achieve is a way to balance the resistances or a method to...

I have an old Rode NT1 condenser Mic. I fixed it a couple of months ago by rewiring. I'm not good at soldering, but it worked. Then it fell from the mic stand and stopped working again. Upon inspection one of the wires had gotten loose from the circuit board. I rewired once more but have had no...

Hello partners I come to you to help me determine what resistance values or what other components I need to be able to design a crowbar circuit that protects my sensor against overvoltages. My intention is to take care of my sensor for voltages above 40V. So I started to design this crowbar...

Hi, I bought DIY amplifier board. And now I am trying to find what I did wrong. It can work for about 2 seconds and then sound dissappear. But power stays on, and LED is glowing I connected 24 volt toroid to start the board. In description it says that circuit is designed for 12 to 36 AC...

Hey guys, So I am making a little joule thief robot looking thing with my son. I should have done a test circuit first but for some reason when I connect the battery I get a tiny little blink and that's it until I disconnect and reconnect then a little tiny blink again. Any ideas on what the...

Hey all I am currently creating a custom rain light for my car (Light on rear bumper that flashes 5 times then holds when brakes are pressed). At the moment the rain light has positive and negative connected straight onto the + and - of a brake light globe wiring. However it being super bright...

Hello everyone, I am an optical Engineer, with a little electrical experience, but it has been a long long time ago since i have made any kind of circuits my self, however that is the "case"here, so i am hoping some one would be willing to assist me. Normally i would just purchase the component...

Hey! So I've been trying to build a modular synth on/off for the last year or so, and one of the most simple projects I thought I should start with is a mixer circuit. I found a really simple circuit schematic and shortly after got it working on breadboard, with absolutely no problem at all...

Hello, I would really appreciate it if there was somebody who could just help me by telling me how to make this. It needs to be only the very bare bone components without any filters. I just need to be told what I need to buy and how to put it together. Ultra wideband, frequency range...