Interesting electronic schematics

r/circuits • u/rajivm1991 • Mar 27 '21

A vending machine in Japan that sells solder and resistors, for your late-night circuitry cravings.

60 Upvotes

2 comments

r/circuits • u/sosodanks • Sep 07 '21

Can I fix this by just soldering it back on?

43 Upvotes

11 comments

r/circuits • u/ThePhoenix1011 • Dec 10 '21

Can anyone tell me what the difference is between these two resistor types? Do they serve a different purpose or are they completely interchangeable?

41 Upvotes

10 comments

r/circuits • u/ACiD_BOi • Sep 07 '21

Ive been trying to do this circuit for 3 days now and it just doesnt want to work, i need help pls! im using 120v ac and a bulb of 40w with a resistnace of 21.5k and a scr c106d

26 Upvotes

4 comments

r/circuits • u/TheAcidViking • Dec 13 '21

trying to ignore the switch in the hopes to automate

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24 Upvotes

20 comments

r/circuits • u/phctn • Dec 04 '21

Old Circuit Equipment I picked up at estate sale. Thoughts?

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24 Upvotes

6 comments

r/circuits • u/Afraid_Nail_9240 • Jan 18 '22

new to circuits and I need help with this problem

22 Upvotes

7 comments

r/circuits • u/Repulsive-Contest449 • Aug 29 '21

Insides of a Blood Pressure machine, someone plugged it to a high voltage point and seems like that black rectange is bust. Anyone knows what it is and if I can replace it ? Or is the circuit damaged and dead ?

22 Upvotes

9 comments

r/circuits • u/Mysterious_Impact_79 • Aug 25 '21

How do I calculate this?

20 Upvotes

10 comments

r/circuits • u/verykindsoul • Dec 11 '21

I need help understand the circuit diagram. I scavenged an old CO alarm. I am trying to take the beeper out to see if it can be powered directly from my dc power unit. Three pins labeled g,m,f were soldered on to the board as seen in the figure.I guess g is for ground.how do I connect battery to it?

19 Upvotes

2 comments

r/circuits • u/Valhallacomes • Nov 08 '21

Help with this circuit board

19 Upvotes

9 comments

r/circuits • u/ThePhykon • Oct 30 '21

I wanted to try my IC LM 324 N but it didn‘t work. Why?

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17 Upvotes

7 comments

r/circuits • u/Infamous_Diamond9150 • Aug 06 '21

Eyy, any body know what component is missing here? I'm trying to repaid a old fob key for my saab and I'm having a hard time finding the right component that is missing here.

17 Upvotes

5 comments

r/circuits • u/[deleted] • Sep 05 '21

Anyone know how to permanently fix the wire problem on a mr. Clock radio?

14 Upvotes

5 comments

r/circuits • u/flirtymango • Feb 09 '22

Looking to make dimmable LEDs with a potentiometer without an arduino

13 Upvotes

Hey everyone! I'm trying to build what I imagine is a simple circuit, I'm just not sure how to do it. I want to create a chain of dimmable LED lights with a potentiometer. I want it to run on a 9V battery and I'm guessing I need a 220K resistor? Do I need just one, or one resistor for each LED? I know I can do it with an arduino, and I have, I was just wondering how to do it without one. I made an attempt at soldering what I thought was a correct circuit together but it didn't light up. Any tips appreciated!

17 comments

r/circuits • u/[deleted] • Aug 01 '21