Electronics Repair

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Schmitt trigger problem

Consider the following circuit: < https://www.dropbox.com/s/r69q3v11ddwuxdc/Screenshot_2016-05-09- 15-58-28.png?dl=0> S...
6 comments posted 10yrs
posted by bitrex
6 comments posted 10yrs posted by bitrex

small motor "brush" material ?

Trying to keep some 1960s junk going. Uses a long thin 1.5V motor so CD motors won't fit. A failed brush/contact. Befor...
18 comments posted 10yrs
posted by diverse
18 comments posted 10yrs posted by diverse

STUPID QUESTION No 4

why are stereo equipment fuses glass tubes in cylindrical holders, auto fuses in vinyl holders fuses set in plastic case...
8 comments posted 10yrs
posted by avagadro7
8 comments posted 10yrs posted by avagadro7

Leaving small devices on constantly.

Leaving small devices on constantly. I have some wireless speakers which use a wireless transmitter that is plugged int...
10 comments posted 10yrs
posted by NONONObobbyburns1111
10 comments posted 10yrs posted by NONONObobbyburns1111

Cap testing question

I have a computer that won't turn on unless it is warm enough. The problem is in the power supply. If I use a blow drie...
24 comments posted 10yrs
posted by etpm
24 comments posted 10yrs posted by etpm

PC Smoke Chapter 2

So, after the long discussion on smoke detectors I thought it best to start a new post hole. I opened the case and look...
9 comments posted 10yrs
posted by freenews
9 comments posted 10yrs posted by freenews

Dead laptop keys after disassembly

I have an Acer E15 net book that runs Xubuntu. Recently the back panel of the clamshell case cracked, and I had to repl...
0 comments posted 10yrs
posted by bitrex
0 comments posted 10yrs posted by bitrex

Phone listening stops working

I live in Md. and have Verizon copper for phone and DSL. The phone I use mostly and for these incidents is hard-wired,...
14 comments posted 10yrs
posted by NONONObobbyburns1111
14 comments posted 10yrs posted by NONONObobbyburns1111

PC Smoke

Quad Core Desktop Windows 7 PC been running for several days. Today plug and unplugged USB drives to make a copy to USB...
52 comments posted 10yrs
posted by X
52 comments posted 10yrs posted by X

Non Working DM-1800 Digital MultiMeter?

Recently removed 2 Digital MultiMeters from storage. When turned on after installing new 9V batteries both did not work...
2 comments posted 10yrs
posted by kenitholson
2 comments posted 10yrs posted by kenitholson

Fluke 8060a meter interconnect strip

I have an old IBM labelled Fluke built DMM (8060a equivalent) that hasn't w orked in years for reasons I don't recall e...
24 comments posted 10yrs
posted by ohger1s
24 comments posted 10yrs posted by ohger1s

Membrane keypads again.

Haven't had time to work on this project recently due to illness. I'm back at it. I'm still trying to figure out the re...
24 comments posted 10yrs
posted by bitrex
24 comments posted 10yrs posted by bitrex

lead free solder

I am in the US and just doing my own repairs and building. Do I need to use any of the lead free solder to repair the b...
23 comments posted 10yrs
posted by rmowery28146
23 comments posted 10yrs posted by rmowery28146

old solder flux

Does the flux in solder really get old ? I have some of the older 60/40 flux core that is over 20 years old and never h...
4 comments posted 10yrs
posted by rmowery28146
4 comments posted 10yrs posted by rmowery28146

IBM W510 Fan Error FRUNO: 60Y5493 P/N: 60Y4981

I have an old W510 with Fan Error and when I power it up with the keyboard out, I can see the fan spin for a second, an...
20 comments posted 10yrs
posted by maxmuller
20 comments posted 10yrs posted by maxmuller