Hobby Electronics Basics

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DC relay coil

I have a DC relay with the coil connections marked "+" & "-". Does it matter? The relay operates with either polarity s...
5 comments posted 4yrs
posted by BobEngelhardt
5 comments posted 4yrs posted by BobEngelhardt

Semiconductor manufacturing locations

Hello, In light of the cargo ship debacle in the Pacific, I am trying to determine which companies still manufacture se...
4 comments posted 4yrs
posted by mrdarrett
4 comments posted 4yrs posted by mrdarrett

anti-music "remote control"

https://www.vice.com/en/article/jg8wnb/square-dancing-noise-china Residents who are fed up with the noise from China's...
3 comments posted 4yrs
posted by *
3 comments posted 4yrs posted by *

DC motor supply

I have a 24v DC motor that I'm using with a PWM controller supplied by a 24v SMPS. I want to be able to briefly switch...
4 comments posted 4yrs
posted by BobEngelhardt
4 comments posted 4yrs posted by BobEngelhardt

Confirmation needed

I'm going to make a 12v DC power supply with a linear reg. I will half-wave rectify 12v AC and have a smoothing cap. Th...
5 comments posted 4yrs
posted by BobEngelhardt
5 comments posted 4yrs posted by BobEngelhardt

transformer core material

AIUI you use iron cores for low frequency and ferrite for high frequency because ferrite doesn't get magnetized, so why...
29 comments posted 4yrs
posted by fizzbintuesday
29 comments posted 4yrs posted by fizzbintuesday

Solar charger

I have a solar charging I am using with my car battery. The current voltage of the battery is 12.7 volts. And the charg...
10 comments posted 4yrs
posted by scientist77017
10 comments posted 4yrs posted by scientist77017

1.8mm Pitch Connectors

2.54mm connectors are easy to find. Is there anything off the shelf for 1.8mm?
3 comments posted 5yrs
posted by bretcahill
3 comments posted 5yrs posted by bretcahill

Audio Attenuator

Hi guys, I have an old vintage HP audio osciallator which I want to use for some experimentation to get more practice i...
6 comments posted 5yrs
posted by cw9877
6 comments posted 5yrs posted by cw9877

Word for making a bad connection?

What's the word for connecting something live and causing the connection to make and break several times rapidly, possib...
11 comments posted 5yrs
posted by CK1
11 comments posted 5yrs posted by CK1

It May Be Time For A Coure In Basic Electroics

Yup, I have seen them teach things wrong for decades. The students don't grasp the ideas the way they do it. Who agrees...
1 comments posted 5yrs
posted by jurb6006
1 comments posted 5yrs posted by jurb6006

Automated Power Cycle

Hey all, Has anyone used or installed a 120volt power relay that would allow for a 23 hour 59 minute on time and a 1 mi...
3 comments posted 5yrs
posted by somewhere
3 comments posted 5yrs posted by somewhere

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