please help

Hello, first i apologise for my bad english im french. My problem is about my THRUSTMASTER AC ADAPTOR (model KA23D200075016G (idk if it is usefull but i put it here in case of...) who was breaked in the shiping. INPUT: 230V AC 50 Hz 130mA OUTPUT 20V DC 750 mA i just need to sold the + and the -...

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...

Hello. I have a very frustrating problem. Im using the lm317 voltage regulator to add adjustability to a fixed output power supply. I have used the lm317 numerous times over the years and never had or seen this problem. I have used regulators from 3 different sources, checked and...

Hello great team! I'd immensely appreciate the help of brilliant minds out here. I've Solar rechargeable emergency unit that can power 2 lights and a small table fan. The unit stopped working with a blown resistor on the circuit. I did try replacing the resistor with an identical color coded...

hello i have a wifi camera from a quadqopter and i used a battery to turn on.I connected the poles incorrectly .and I smelled burning, i open it and i saw a ic is burned i searched the name of ic but i cant find the data sheet.it is written on it: FA2UMK .it has 5-pin and it is smd.please help...

Hi Everyone, my DT project includes an inductive charger. I would like to build a circuit that when a voltage is received from the inductive charger (9Vdc in ~5Vdc out) one LED blinks then after 10s it remains constant. Then turns off when voltage is stopped. I’m not entirely sure how to go...

Hi people I would like to make a digital clock with HOURS and MINS using 74LS192 IC. Below attached is my schematic diagram for the connection of the circuit. However, the MINS counter keeps counting from 00-59 and resets and does not increase the HOURS counter after each 60mins. Components...

Circuit problem: I have the answers to it, but I need to know the process of how to get there.

I'm trying to design an LED driver that takes a ground as ON, performs a logical NOT on it, and sends it into an N Channel MOSFET. The MOSFET will give ground to a color channel on an LED strip. LED Strip Driver-schematic.pdf I believe I have taken care of everything, but to be honest, this is...