help

Im new to these kinds of stuff, very noob question here but I found an old car amplifier with a sub on it (attached photo). I’ve watched YT vids on how to actually make it work. Im just wondering if in the “bridged” speaker out i can just put a female 3.5 mm to bare wires. since i only have...

The circuit shown below is intended to power and control 5 small stepper motors and 3 end/limit switches. It takes power from a wall outlet like shown below and converts the ac current to dc power. This voltage then gets bucked down and sent to microcontroller which then is connected to motor...

hello, i had a 9 inch monitor my car and after long time i open it and i want to use it's TFT display, i don't know how to use it but i know something: 1. it has 50 flat and one board on it, that merge the 50 flat from display and 10 flat from controller and send it to main board with 50 flat...

I know its a bit janky but Ive just needed to make this door opener device remote control and for some reason, I cannot get this receiver to power anything even when both channels are on. Can someone help me?

Trying to design a photo-enlarger, and as part of it, I need to be able to control the relative brightness of a 20w cobb led thats powered off of 30v. I'm trying to use an off the shelf mosfet board (HW-700) that I had around that I can use alongside an arduino to control the led using pwm...

I Recently got hold of a dso138 kit, upon finishing the kit I went through testing all of my voltages and everything appears correct. The LED flashes once when powered on but only when the LCD screen is not plugged in. If the screen is plugged in, absolutely nothing happens and when I check my...

I have bought this Delay Relay module off of amazon. I am using it to make a circuit that will act as a latching relay with a delay for a 12V power source. The circuit should work as follows: There is a switch to activate the relay. When activated, the relay will remain on until the 12V power...

Hello, fairly new to all this but done my best to get to this stage! Im repairing a pottery wheel and am looking for a modern replacement for a STOPCIRCUIT GDU-2U-73-P1. As i understand this is a panel mount 2a, trip curve c, circuit breaker with an auxiliary contact. Looking through spec...

So hello:3 I have already tried many things, and looked at many things, but I can't implement any way to read a value from my data table character by character here code: Morse: mov DPTR, #Text ; Point to the beginning of the text mov...

Hi all, I'm looking for some help with a light switch from the rear interior lights of a Vauxhall Insignia. I've scoured the internet with the parts numbers and manufacturer assembly numbers etc and came back with no results. All I know is that this is an on/off push button switch made by...

Hi all, First, for you ADHD go-gettum problem solvers who like staring at funny graphs that aren't doing what they should be doing, the TL;DR: There's a funny electronic buzzing sound in all of my sensitive/expensive electronics and it's even gotten louder; please help me understand this...

Hey guys, I am trying to diagnose what the issue is with my Kurzweil CUP2 digital Piano The piano displays no sign of life besides a red on led. LCD screen does not display anything Buttons do not seem to do anything(there is a little red light above each button that indicates the "mode" it is...

Hey guys, I am relatively new to micro electronics, and am in desperate need of help! I want to bypass the muting circuit in a electronic piano. This involves either activating the relay, or pulling it to ground (BA3-5 Relay, and the highlighted LS1 in the picture below). Please could someone...

Hi. A friend gave me a JTS JS-1E large diaphragm condenser mic that has been partly disassembled and needs some soldering. Seems to be quite simple but Im not sure how it should be wired. As shown in the photos there is an M- and M+ that I think need to go to the diaphragm but I don’t know where...

I designed a circuit to process input from a sensor with a range of -300 mV to 300 mV. The desired output of the circuit is 0 V to 600 mV. To achieve this, I used the op-amp equation Vout = Vin + 0.3 as a basis for my design. However, when I simulated the circuit, the output was only around 900...

Hi all, Question for any of you who may know: How does mobile robot charging work safely? I notice a lot of delivery robots are designed with these large contacts (boxed in red below), but how are these designed to prevent them from being live contacts in case of customers accidentally...

Hi everyone I need to make a circuit with the following elements: The output will be a siren connected to a 230 V and 50 Hz network. The control circuit will use a 9 V battery as power supply and an operational amplifier must be used, the siren will be activated with a relay. The alarm will...

As the title states this is my first PCB I have designed purely through documentation, I have this designed through breadboards and breakouts but am attempting to put it all onto a single board so I can scale it down after I know it all works. Are there any people I can talk to to fix design...

I have a little experience with wiring after having to hot-wire my aftermarket radio in my car when changing it out, however I do not know how to fix this issue. The wires in the plug were loose and the lights were not turning on because of this, so i cut it off and figured it'd be as simple as...

Hi, I bought a claw machine and there seems to be a problem with the motor control of the claw going up. when the claw is going up it will go for a brief period and then stop, the motor will stall and it throws an error (claw not going up) . Motor seems fine 28v 0.48a when powered with bench...