Reddit:Electronics

The circuit displays a continuous irregular repeating countdown; 4, 7, 2, 1, 4, 7, 2, 1, etc. It uses 3 J-K flip-flops, a decoder, a 7-segment LED display, and a few resistors. It is hooked up to a function generator that generates a 1 Hz pulse wave and a DC voltage source. I determined the proper J-K connections with Karnaugh mapping. 3 more years to go.

Was trying to make a voltage regulator and accidentally hooked up an 80v psu to it (the schematic said it was rated up to 30v)

This development board was provided to me in my college during the labs for trying out various circuits. It had so many options available but I never really got to know about a few except the basic breadboard part, power supply, input/output ports and the seven segment display. The first time I saw this, I was really excited about working on it and it was a very good experience.

I built a multi-controlled relay board for my electronics workbench.

It can be controlled by web interface, HTTP GET, websocket, MQTT, UART (4pin JST header on top) and USB/serial. It also send changes to all these connections.

On the web interface you can define 25 groups of on/off states of the relays. Each group can be recalled by any of the interface methods, and you can also set a group to one of the two buttons for quick manual recalls.

The board works on the 24V supply I have all over my workbench, that's what the two 2pin JST headers are for (2nd one for daisychaining). All relay contacts are on the bottom side, there are two male and two female headers for every COM, NC and NO.

I wrote a little piece of code for my Stream Deck, so I can see and switch states of every relay and also recall every group from it.

I ise this thing to control and especially automate workflows on my electronics workbench. It's great for long run test series of things.

Did it in my free time with spare parts lying around and a lot of hot glue to keep stuff together and insulated. Originally ran off 10-12vac with a brake light. Switched it to 10-12vdc and stuffed a 12v cob led into the lamp part, with a small heatsink and fan to keep it cool. Led stays within operating temps and I’m happy with it

Hello, so I want to connect my motor to this BLDC driver in the picture but, the driver has 5 pins and the motor has 6 pins does anybody know how to convert 6 pin to 5 pins ? On the internet I found the last picture but I don’t know how I can identify which pins are which on the motor to wire it correctly.

Some of you may remember this PSU I made a while ago. Well, as I mentioned in that post, I figured I could make a variable one with a voltage and current meter. So here it is so far. That's a TP4056 charger board, an 18650 battery salvaged from a dead aquarium air pump, a variable step-up board which I've removed the trimmer and wired in a multi-turn potentiometer. And those two wires poking through the left side, they lead to a battery level indicator. The thicker red and black are for the ammeter, and it's kind of odd because although it's red in, black out, it has to be in the negative line, so that red wire is actually the negative out from the PSU. Positive out will come from the step-up board, and the yellow wire will connect there, that's the voltage sense for the meter.

https://preview.redd.it/qa2eg7veeh3c1.jpg?width=4096&format=pjpg&auto=webp&s=5ad35cea9a5776b6b4d2a4371ddad9bda66ea40f

Amplifier and speaker chassis is made out of cardboard. Amplifier ic i used is 6+6W TDA1517. Loudspeakers, few capacitors and heatsink are salvaged from old Sony tv.

I'm repurposing an old ATX PSU as a bench PSU. I made this little "front panel" using a 3-way EBE rotary switch in order to have only one pair of output terminals. Using relays for actual power delivery since the current limit for the switch is 2A. Testing soon, hope y'all like it!

It was fully broken now it looks okay, sorta first time doing correct soldering and this was fun overall

Hey guys if any one want to buy fans 12v in India Dm me.. International shipping would cost more than new fans so... Lot of 120mm and 80mm

Also have got 2 motors GR63x55 original they are like 2-3kgs..

Can any one suggest me what i can do with them? Any decoration /show item on wall etc.. please suggest thank you.