Hobby Electronics Basics

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Really basic transistor question

I want to build a device that will take my phones off line. The phones are connected to a Vonage modem that (I'm sure)...
3 comments posted 7yrs
posted by BobEngelhardt
3 comments posted 7yrs posted by BobEngelhardt

Switch for vaporizer

I use this switch for a hot vaporizer. I noticed the switch get pretty warm when vaporizer is running. It draws 5 amps,...
7 comments posted 7yrs
posted by scientist77017
7 comments posted 7yrs posted by scientist77017

Switch for USB cable

This is an electronics question. :-) I have problems scanning documents. To get a scan to work, I have to unplug the us...
2 comments posted 7yrs
posted by scientist77017
2 comments posted 7yrs posted by scientist77017

Interacting externally with a PC?

Any suggestions on a no-brainer and safe way to get external input recognis ed by a PC please? Apart from a voice comma...
9 comments posted 7yrs
posted by terrypingm
9 comments posted 7yrs posted by terrypingm

Lifespan of lithium-polymer battery

What is an average lifespan for a lithium-polymer battery? I have one in my fitbit. Andy
12 comments posted 7yrs
posted by andrewkennedy775
12 comments posted 7yrs posted by andrewkennedy775

noise lecture

I'm giving my kids a little lecture on noise this afternoon. Here's my outline. Did I miss anything? Noise In Electroni...
0 comments posted 7yrs
posted by jjlarkin
0 comments posted 7yrs posted by jjlarkin

Cycling Safety Transponder, 15m - 45m Range

The Bike Shield app never caught on because of spotty data in scenic areas. Also some cyclists don't like posting their...
14 comments posted 7yrs
posted by bretcahill
14 comments posted 7yrs posted by bretcahill

A question about led drivers

I've no experience with them so any info could be helpful. My question is that it seems to me that there are often a se...
10 comments posted 7yrs
posted by default
10 comments posted 7yrs posted by default

18650 battery holder

Is this the right battery holder so that I get 3.7 volts?...
4 comments posted 7yrs
posted by andrewkennedy775
4 comments posted 7yrs posted by andrewkennedy775

Looking for 2mm pitch 2-row female connectors

Hi folks, I've got an industrial PC module (MSI MS-96F6). I'm looking for matching connectors. 2.54mm molex is common,...
4 comments posted 7yrs
posted by email
4 comments posted 7yrs posted by email

mutual capacitance?

Looking at network theory and the duality theorems, why is there no mutual capacitance? i.e. electric flux linkages, sym...
36 comments posted 7yrs
posted by r_delaney2001
36 comments posted 7yrs posted by r_delaney2001

PC PSU repurposing

I am going to repurpose a PC PSU & I have a question about minimum loading. Many/most PSU's require minimum loads on th...
10 comments posted 7yrs
posted by BobEngelhardt
10 comments posted 7yrs posted by BobEngelhardt

18650 for 3.0 v application ?

I have a door bell that uses 2 aa batteries. Would a 18650 work in such an application. I don't know if 4.1 volts would...
6 comments posted 7yrs
posted by andrewkennedy775
6 comments posted 7yrs posted by andrewkennedy775