Hobby Electronics Basics

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Using Batteries For Odd Voltages

I'm looking at a small (simple (beginner)) circuit that I intend to build. It is a portable guitar amplifier, designed...
16 comments posted 21yrs
posted by blahbleh666
16 comments posted 21yrs posted by blahbleh666

DC & Op Amps

In PSPICE I created a circuit with a VDC = 6V feeding into a uA741 op-amp in a inverting amplifier configuration, with...
1 comments posted 21yrs
posted by slave
1 comments posted 21yrs posted by slave

Audio Power to Activate a sensitive Relay

Hi Folks: I would like some assistance with the following: Could someone direct me to a simple schematic that will perf...
5 comments posted 21yrs
posted by gerryogrady
5 comments posted 21yrs posted by gerryogrady

Soldering question

Can someone tell me how hard it would be to solder something like this... http://rocky.digikey.com/WebLib/Astec/Web%20D...
1 comments posted 21yrs
posted by 1qazse4
1 comments posted 21yrs posted by 1qazse4

Mpeg green line error? why not green blocks error?

Dear All, I found some green blocks on my video, when I tell to an engineer, he tell me there are "green line" error. Is...
1 comments posted 21yrs
posted by bokiteam
1 comments posted 21yrs posted by bokiteam

555 to drive mosfet/igbt

I was experimenting driving various mosfets and igbts with a NE555 at a low freq around one per sec turning a small bul...
4 comments posted 21yrs
posted by kellrobinson
4 comments posted 21yrs posted by kellrobinson

WALL C'LOCK NOT LASTING ?

When ever i buy a new wall c'lock the seller mentioned don't use alkaline battery just use a nomal battery other wise it...
12 comments posted 21yrs
posted by mowhoong
12 comments posted 21yrs posted by mowhoong

Serial or Parallel ADC?

Hi all, I want to interface my PIC uC with external ADC, I want to know which is more easy and better a serial ADC or a...
8 comments posted 21yrs
posted by nospam4u_jack
8 comments posted 21yrs posted by nospam4u_jack

Sine to square wave converter

Hi all, How can I convert 50Hz AC to a square wave so that I can feed it to a microcontroller? Will CD4093 work here? I...
21 comments posted 21yrs
posted by nospam4u_jack
21 comments posted 21yrs posted by nospam4u_jack

a camera question

how long do video cameras used for security installation operating continuously, last? i mean that video quality degrad...
1 comments posted 21yrs
posted by angkin2000
1 comments posted 21yrs posted by angkin2000

design discrete mic pre?

Hey all; I'm thinking about building yet another mic preamp. I've currently got one built around the SSM 2017, and it s...
8 comments posted 21yrs
posted by toccata
8 comments posted 21yrs posted by toccata

Find current from voltage drop?

Hi, The voltage drop formula: K x I x L x 2 E = ---------------- CMA I know all the values, except "I", so is there a fo...
4 comments posted 21yrs
posted by js5895
4 comments posted 21yrs posted by js5895

74688 vs 74684

I have been looking for a 74688 for my project (elektor Logic Analyzer) But have not been able to find any who sells it...
2 comments posted 21yrs
posted by tlovas
2 comments posted 21yrs posted by tlovas

Power at 240VAC relay with DC 312V

Hello all, I am just finishing my charger controller for my electric vehicle. I want to power a 240VAC coil relay with...
16 comments posted 21yrs
posted by a8723
16 comments posted 21yrs posted by a8723