Hobby Electronics Basics

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Generator harmonics question(s)

Years ago I adjusted a neighbor's generator so that it put out 60 cycles at 120 volts. I used a TEK 465B 'scope to look...
3 comments posted 8yrs
posted by etpm
3 comments posted 8yrs posted by etpm

Baffling simple circuit

https://i.imgur.com/OWbZIrH.jpg The circuit monitors a battery & when its voltage is above an adjustable threshold, it...
15 comments posted 8yrs
posted by BobEngelhardt
15 comments posted 8yrs posted by BobEngelhardt

Soldering to Phosphor-Bronze

Are there any guidelines for soldering 18g leads to Phosphor-Bronze? I assume that I should rough the Phosphor-Bronze u...
3 comments posted 8yrs
posted by Searcher7
3 comments posted 8yrs posted by Searcher7

Custom Fingerboards

I wanted to ask if it were possible to create printed circuit fingerboards with trace thicknesses that are thicker on o...
7 comments posted 8yrs
posted by Searcher7
7 comments posted 8yrs posted by Searcher7

Plating Tiny Contacts

Can someone advise me on whether it is possible to (Nickel or Gold) plate a small item like an electrical contact while...
9 comments posted 8yrs
posted by Searcher7
9 comments posted 8yrs posted by Searcher7

What is the color code for a -10 ohm resistor

What is the color code for a -10 ohm resistor. That's a NEGATIVE 10 ohm resistor, not a standard (positive) 10 ohm brown...
20 comments posted 8yrs
posted by oldschool
20 comments posted 8yrs posted by oldschool

Li-ion battery degrade?

I was measuring torque required to drive various drill bits and incidentally found that my cordless drill was deliverin...
8 comments posted 8yrs
posted by BobEngelhardt
8 comments posted 8yrs posted by BobEngelhardt

Why are computer power supplies like this?

I noticed this before and again last night. I am changing plugs from a bad supply to a good one. There is a connector w...
12 comments posted 8yrs
posted by etpm
12 comments posted 8yrs posted by etpm

will this work

What I want to do is make a 12vdc electronic circuit breaker, with essentially no voltage drop for current sensing. A 1...
12 comments posted 8yrs
posted by default
12 comments posted 8yrs posted by default

Mixed mode simulation in FEMM/LTspice

Please point me on some tutorial on using FEMM and LTspice in couple to do mixed-mode gauss simulation/optimization (ma...
1 comments posted 9yrs
posted by qershin
1 comments posted 9yrs posted by qershin

A timer device with relay

I've been looking for a low power and low cost timer device or info on how I could use to build one. I need to turn a r...
11 comments posted 9yrs
posted by test
11 comments posted 9yrs posted by test

Deformables Hack For Melted Large Screen TV

An acquaintance said her TV didn't work. I knew the problem immediately: Everything including asbestos cement warps fro...
5 comments posted 9yrs
posted by bretcahill
5 comments posted 9yrs posted by bretcahill

How to connect audio input to a breadboard

I need to connect the audio output of a walkie talkie to a breadboard. The WT jack is 2.5mm stereo. Does anyone know of...
3 comments posted 9yrs
posted by waybackNO584SPAM44
3 comments posted 9yrs posted by waybackNO584SPAM44