Hobby Electronics Basics

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Can a single supply op amp be used for a summer?

Hello, I'm working on a circuit where I want to shift/scale a 0-5V input to 1-5V. I am using single supply op amps. Can...
27 comments posted 17yrs
posted by andrewkgentile
27 comments posted 17yrs posted by andrewkgentile

Simplest Possible Analog Divider

Some circuits use transistors or diodes to take logs, subtract and then exponentiate to divide two signals. The simples...
6 comments posted 17yrs
posted by BretCahill
6 comments posted 17yrs posted by BretCahill

LED activated by LDR

Let's say I have a circuit like this: http://img504.imageshack.us/i/ldr.png/ When I shine the LDR, the LED instead of h...
7 comments posted 17yrs
posted by cassiano
7 comments posted 17yrs posted by cassiano

DIY electromagnet under £100: Disappointing results

Hi everyone, I took part in a competition of my college's electronics club to build an electromagnet under =A3100, with...
3 comments posted 17yrs
posted by jessie.taylor91
3 comments posted 17yrs posted by jessie.taylor91

Quick connect/disconnect crimp terminals

Hi, looking for **fully insulated male** .187 crimp terminals for 18-22 wire guage (aka spade terminals) in anything ot...
16 comments posted 17yrs
posted by oparr
16 comments posted 17yrs posted by oparr

Hints and Tips

Hi all, I posted a thread on alt.binaries.schematics.electronic asking for Hints and Tips that you have picked up. If y...
1 comments posted 17yrs
posted by amdx
1 comments posted 17yrs posted by amdx

how does an audio signal work?

When I plug headphones into an ipod, I know that electricity of some kind flows through the wire into the headphones, p...
11 comments posted 17yrs
posted by unknown.hero
11 comments posted 17yrs posted by unknown.hero

Chip Shults

Is he still around anywhere? R
4 comments posted 17yrs
posted by dewhurst
4 comments posted 17yrs posted by dewhurst

Light bulb question

I have an enclosed light fixture that is rated and is using a 6oW incndescent bulb. I really need more light, so I thou...
12 comments posted 17yrs
posted by me
12 comments posted 17yrs posted by me

555 does Class D Audio?

http://personal.inet.fi/surf/rushi/555d.html http://personal.inet.fi/surf/rushi/pics/555d.png
6 comments posted 17yrs
posted by mrdarrett
6 comments posted 17yrs posted by mrdarrett

Muddle over left/right channel of TRS plug

I have a 3.5mm TRS plug which is prewired. It looks like this http://www.mycablemart.com/store/images/products/1085_lar...
33 comments posted 17yrs
posted by invalid
33 comments posted 17yrs posted by invalid

How Does the Cost of Hearing Aids Defy Gravity?

You'ld figure the battery would be the most expensive part and they would be disposable by now. Bret Cahill
13 comments posted 17yrs
posted by BretCahill
13 comments posted 17yrs posted by BretCahill

Rectifier output?

120vac input to full-wave rectifier bridge. Without any filtering components what is the output RMS voltage? This does n...
23 comments posted 17yrs
posted by gloriasbest22
23 comments posted 17yrs posted by gloriasbest22

Current Transformers

In the winter I use oil filled electric radiators in the house to help even out the heat. The problem is that I always...
8 comments posted 17yrs
posted by regor
8 comments posted 17yrs posted by regor