Hobby Electronics Basics

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Need circuit to measure capacitance?

Does anyone know a circuit to measure electrolitic capacitors in the range 10uF to 20000 uF ? I have a 555 ic , a 5v sup...
15 comments posted 20yrs
posted by ayanamer
15 comments posted 20yrs posted by ayanamer

In Car Solar mp3 charger

Hi, I have a cheap mp3 player in my car that runs off a 1.5v aaa battery. I have to change the battery once twice a wee...
0 comments posted 20yrs
posted by s.brooks
0 comments posted 20yrs posted by s.brooks

high intensity LED

Hi, i recently saw a LED flashlight (mag lite) format with an extremely high intensity light. Does anyone know where i c...
5 comments posted 20yrs
posted by aefjkjjhh
5 comments posted 20yrs posted by aefjkjjhh

Braille

Hi everyone i have a little problem converting to braille,Braille is a system which allows a blind person to "read" alp...
10 comments posted 20yrs
posted by tcharfa
10 comments posted 20yrs posted by tcharfa

H-bridge with Pic

hi , I have a pic chip and I am trying to control a L293 H-bridge. Althought I do not get much power out of the Bridge,...
12 comments posted 20yrs
posted by lerameur
12 comments posted 20yrs posted by lerameur

Power supply question

Hello all, the AC adaptor for my 4 year old Toshiba portable DVD player died. The specs on it list 12 VDC, 2 amps. Look...
2 comments posted 20yrs
posted by biscuitbecks
2 comments posted 20yrs posted by biscuitbecks

Trimmer resistor rookie question

If a circuit schematic looks like: (a) ---------o---R4K7---------o ^ | | | > | /< R10K > / > < R4M7 / | > | | ---(b)---...
2 comments posted 20yrs
posted by dwbauer
2 comments posted 20yrs posted by dwbauer

Red LED

some years ago I tried to build up a multivibrator circuit and i attached red LED so that i glowed around a frame the t...
2 comments posted 20yrs
posted by bala150985
2 comments posted 20yrs posted by bala150985

voltage regulator

i need some help i trying to built a rectifier / voltage regualtor i got 18v ac coming into the rectifier the thing is...
12 comments posted 20yrs
posted by ft1
12 comments posted 20yrs posted by ft1

Pad Calibration Resistor

What is a "pad calibration resistor"? What for it is used?
1 comments posted 20yrs
posted by agrajame
1 comments posted 20yrs posted by agrajame

Resistor question

My question is : Is a 68 ohm 1/8 watt resistor the same as a 68 ohm 1/4 watt or 68 ohm 1/2 watt. My led circuit calls fo...
3 comments posted 20yrs
posted by dplatz
3 comments posted 20yrs posted by dplatz

Electronic Analogue To A Slinky

Would alternating a lot of capacitors and inductors in series approximate a Slinky spring? Bret Cahill
16 comments posted 20yrs
posted by BretCahill
16 comments posted 20yrs posted by BretCahill