Hobby Electronics Basics

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Will this work safely?

Pressing the door button of my commercial wireless door bell causes the mains-powered speaker unit in the hall to chime...
10 comments posted 7yrs
posted by me
10 comments posted 7yrs posted by me

Inductance calculations

Somewhere there must be a formula for the inductance of a hand-wound coil. Air core, one layer of wire (of given swg) c...
5 comments posted 7yrs
posted by peterxpercival
5 comments posted 7yrs posted by peterxpercival

Harmon divider 10:1 and 100:1

Just found this neat method to make 10:1 voltage dividers. Not as important now that you can get such precision resisto...
3 comments posted 7yrs
posted by nojunk
3 comments posted 7yrs posted by nojunk

Anyone with plc experience?

I was looking for a ready made timer for a hydroponic system I'm tinkering with and came across some el-cheapo PLCs on...
5 comments posted 7yrs
posted by default
5 comments posted 7yrs posted by default

GFCI/lightening

I had a lightning strike hit an antenna mast and it took out a lot of electronics in my house. It actually popped circu...
2 comments posted 7yrs
posted by default
2 comments posted 7yrs posted by default

The Tardigrades

We can't just leave them there to die.
1 comments posted 7yrs
posted by snap
1 comments posted 7yrs posted by snap

Current vs. wire gauge

What current can 18AWG wire carry? And, more usefully, is there a table somewhere giving this info for all the usual gau...
7 comments posted 7yrs
posted by peterxpercival
7 comments posted 7yrs posted by peterxpercival

12 Vdc led running hot

I bought some 12 VDC 5 mm red leds. They work find but... when I touch the wires going into the led, they were hot enoug...
11 comments posted 7yrs
posted by scientist77017
11 comments posted 7yrs posted by scientist77017

Rebuild computer speakers

I bought some Inland Pro Sound 2000 speakers from a thrift store. It is an amplified system putting out about 7 watts....
2 comments posted 7yrs
posted by scientist77017
2 comments posted 7yrs posted by scientist77017

Two diode vs four diode rectification

What is the advantage of a four diode bridge full-wave rectifier over a two diode full-wave rectifier. There must be som...
19 comments posted 7yrs
posted by peterxpercival
19 comments posted 7yrs posted by peterxpercival

Isolation transformer?

I was looking for a 120-120 isolation transformer on eBay and I kept finding 120-240/480 transformers. There are 2 seco...
17 comments posted 7yrs
posted by BobEngelhardt
17 comments posted 7yrs posted by BobEngelhardt

Replacement NiMh battery for small solar light

I replaced a 600 Mah NiMh battery in a small solar light with a 2300 Mah since I had no 600 Mah hr batteries in my stoc...
1 comments posted 7yrs
posted by scientist77017
1 comments posted 7yrs posted by scientist77017

Soldering paste

I recently received this and am learning about what applications it is good for. https://imgur.com/3pGTm0a I put a smal...
10 comments posted 7yrs
posted by scientist77017
10 comments posted 7yrs posted by scientist77017

Dropbox test

https://www.dropbox.com/sh/lx4vkcno5thghc5/AAAQ0-_kBJz86FkV2-MN5Mxea?dl=0 Can non-Dropbox members open this folder and s...
4 comments posted 7yrs
posted by jjlarkin
4 comments posted 7yrs posted by jjlarkin