Hobby Electronics Basics

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PSU for valves

I thought I'd experiment with a few valve circuits (just for fun). So I'll need an H.T. power supply and I'm looking at...
12 comments posted 5yrs
posted by peterxpercival
12 comments posted 5yrs posted by peterxpercival

Thermostat

Best to ask here or ? My gas furnace is a Holly. It has an old mercury two wire thermostat. I want to change the thermo...
6 comments posted 5yrs
posted by Olden
6 comments posted 5yrs posted by Olden

Really Basic Power On Question

This must be a really really common problem and the only reason it is diffi cult to find on youtube is the wrong search...
1 comments posted 5yrs
posted by bretcahill
1 comments posted 5yrs posted by bretcahill

3 phase AC to DC

I am running 3 phase AC into a set of transformers, Y config, and thence into bridge rectifiers . One leg of the output...
5 comments posted 5yrs
posted by fritzo2ster
5 comments posted 5yrs posted by fritzo2ster

Use resistor instead of regulator?

I can put a resistor after a voltage that's too high for the circuit? Of course the resistor must handle the current. A...
7 comments posted 5yrs
posted by always.look
7 comments posted 5yrs posted by always.look

Ten 860v Electric Eels Wire Themselves In Series

"For The First Time, Electric Eels Have Been Seen Hunting And Zapping Prey as a Group" https://www.sciencealert.com/for...
1 comments posted 5yrs
posted by bretcahill
1 comments posted 5yrs posted by bretcahill

Full wave rectified source for DC motor

I need a sanity check - I think I understand, but there's doubt. If I rectify AC with a bridge and use the full-wave ou...
6 comments posted 5yrs
posted by BobEngelhardt
6 comments posted 5yrs posted by BobEngelhardt

Cheap Chinese rubbish

An LED striplight. After 1 month, BANG! A puff of smoke and a hole blown in the side of it. What I think used to be an...
28 comments posted 5yrs
posted by CFKinsey
28 comments posted 5yrs posted by CFKinsey

Remote On Switch for Devices

I don't want to have to be there to turn on the cam. Instead it needs to be turned on by a relay. If necessary I will i...
2 comments posted 5yrs
posted by bretcahill
2 comments posted 5yrs posted by bretcahill

Rope Light Circuit

The sealed-up-in-plastic power supply comes with the plug, 110v U.S. or 220 v EU. On a 110 v AC U. S. plug the output a...
4 comments posted 5yrs
posted by bretcahill
4 comments posted 5yrs posted by bretcahill

Power Routing Switch

Working on a gadget that uses a 12 volt motor (10 amp peak) and misc electr onics running on lower voltages. It is powe...
1 comments posted 5yrs
posted by gnuarm.deletethisbit
1 comments posted 5yrs posted by gnuarm.deletethisbit

EV Stocks On Fire

https://www.barrons.com/articles/tesla-xpeng-other-ev-stocks-are-on-fire-this-is-why-51605901707
0 comments posted 5yrs
posted by bretcahill
0 comments posted 5yrs posted by bretcahill

Amateur alarm circuit problem

I built an alarm circuit from a book I bought called Make Electronics by Charles Platt. https://drive.google.com/file/d...
23 comments posted 5yrs
posted by rob
23 comments posted 5yrs posted by rob