Hobby Electronics Basics

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Problems with 12V and 5V lines on a PC ATX supply

Why do (cheap? expensive ones may be better) PC ATX power supplies need current drawn from the 5V line to make the 12V...
10 comments posted 6yrs
posted by CFKinsey
10 comments posted 6yrs posted by CFKinsey

Schmitt Triggers

I have been looking at schmitt trigger circuits and didn't realise how many variations there are. Anyway I found this o...
32 comments posted 6yrs
posted by rob
32 comments posted 6yrs posted by rob

AoE 3rd Ed heavy discount on Amazon UK

A UK heads up, https://www.amazon.co.uk/Art-Electronics-Paul-Horowitz/dp/0521809266 I had the first edition at college,...
9 comments posted 6yrs
posted by email
9 comments posted 6yrs posted by email

Measuring Accuracy: 1.0 grade

An Amazon meter is described as having "Measuring Accuracy: 1.0 grade". I found that there is a standard that defines t...
3 comments posted 6yrs
posted by BobEngelhardt
3 comments posted 6yrs posted by BobEngelhardt

Speaking of 555s...

Recently I added an air cylinder to a manual lathe that opens the half nut when threading by moving the proper lever. F...
10 comments posted 6yrs
posted by etpm
10 comments posted 6yrs posted by etpm

Basic circuit help please

I have put together a circuit from here: https://circuitdigest.com/electronic-circuits/light-fence-circuit-diagram-with...
64 comments posted 6yrs
posted by rob
64 comments posted 6yrs posted by rob

OT History of Carbon

https://www.tf.uni-kiel.de/matwis/amat/iss/kap_4/advanced/t4_2_1.html#_3 or https://tinyurl.com/tubg3yk Deals with the...
0 comments posted 6yrs
posted by default
0 comments posted 6yrs posted by default

Remote repeater - bit more power to led output

Hi, I'd be grateful for a little advice. I use a tvLINKplus device for repeating the magic eye remote signals which are...
3 comments posted 6yrs
posted by bob
3 comments posted 6yrs posted by bob

Wattage of rough service incandecent bulbs ??

I have build a series load test light. eg. you plug a load in and it runs i n series through a lamp, in case there is a...
48 comments posted 6yrs
posted by stevwolf58
48 comments posted 6yrs posted by stevwolf58

Pilot light

I have taken some pilot lights out of a broken stove. These lamps indicated whether the element was on or the element w...
9 comments posted 6yrs
posted by stevwolf58
9 comments posted 6yrs posted by stevwolf58

Failure mode of LEDs in overcurrent situation

I'm curious about what happens to an LED when it is exposed to a moderate overcurrent situation. This question came abo...
3 comments posted 6yrs
posted by and4y2
3 comments posted 6yrs posted by and4y2