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A subreddit for practical questions about component-level electronic circuits: design, repair, component buying, test gear and tools.

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What is CR7 supposed to be?

Posted 21st Apr 2026u/Snazzy21

Should I buy this $50 kit to start learning electronics?

Posted 21st Apr 2026u/cavepor

Secure disposal question and common practice

Posted 20th Apr 2026u/Those_Silly_Ducks

5070ti shipment damage in prebuilt am I cooked?

Posted 21st Apr 2026u/Thelion5252

I can't quite wrap my head on how this switching power supply works.

Posted 20th Apr 2026u/1Davide

A replacement for a fan resistor

Posted 21st Apr 2026u/Sweet-Guidance1971

Does this old stuff is useful or not ?

Posted 21st Apr 2026u/deadlist__me

I2C with ATMEGA328PB internal pullups at 100khz, works fine. Does not look good on oscilloscope. Should I push my luck or reduce the clock to 50khz or less?

Posted 20th Apr 2026u/IShunpoYourFace

Mc6847 video display generator circuit output character blurriness

Posted 21st Apr 2026u/jadovk

What automotive plug is this?

Posted 21st Apr 2026u/comoestasmiyamo

Help with BQ25185 (weird issue)

Posted 21st Apr 2026u/SpeedRa1n

Is the resistor broken?

Posted 21st Apr 2026u/Emotional_Ad1623

Is having small “marks” on plugs okay?

Posted 20th Apr 2026u/AffectionatePanda600

I used a Shelly 1 Gen3 to automate my garage door opener. After wiring it up and testing, the garage door now only closes! :/

Posted 20th Apr 2026u/global0

What are these components? Why are they used?

Posted 21st Apr 2026u/Fearless_Concert2174

Surface mount capacitors marked “EHP” where voltage rating normally is - What does this mean?

Posted 21st Apr 2026u/Elegant_Law_7943

Pot VR101has not effect, how is it meant to work? what could be the fault?

Posted 20th Apr 2026u/kamen__temeljac

Is the left capacitor dead?

Posted 21st Apr 2026u/VanillaCokeisthebest

TPS63900 Buck-Boost outputting 0V.

Posted 21st Apr 2026u/BiruDoBiruleibe

Is the onsemi NCP302045 a viable replacement for a AOZ5332QI DrMOS despite THWN and DISB# pins switched?

Posted 21st Apr 2026u/Koalakuun

Can anyone identify these components?

Posted 20th Apr 2026u/SwampRatMiniatures

Driving PMOS with NMOS Circuit not working

Posted 20th Apr 2026u/Various_Area_3002

Help me identify this chip

Posted 20th Apr 2026u/Juppie902

Is this transistor broken?

Posted 20th Apr 2026u/Emotional_Ad1623

Dá pra salvar ?

Posted 21st Apr 2026u/Slow_Series_5174

Is it possible to get this beer cooler controller to work with my minifridge?

Posted 21st Apr 2026u/CaydenPlayzTTV

Help to identify this type of resistor?

Posted 21st Apr 2026u/pmodizzle

Do these capacitors look pooched?

Posted 21st Apr 2026u/amcnewman

Replacing the power socket on an 8mm cine projector

Posted 20th Apr 2026u/ashleary

Why aren't these SMD push buttons working properly?

Posted 20th Apr 2026u/NerdyCrafter1

Recrated wave share circuit is dead

Posted 20th Apr 2026u/Yarmahd

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