Hobby Electronics Basics

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Dual transistors

The circuit described at http://www.far-out.demon.co.uk/cardiy/tempgage.htm is to improve the dash temperature gauge pe...
14 comments posted 19yrs
posted by jag_manR__EM*-0_V_E653
14 comments posted 19yrs posted by jag_manR__EM*-0_V_E653

Car amplifier and capacitor problem

I have a 1200 watt amp with a capacitor hooked up to 2 12" MTX Subwoofers. I've had them hooked up good the past couple...
5 comments posted 19yrs
posted by confusion1431
5 comments posted 19yrs posted by confusion1431

p-n junction question

When various textbooks explain the operation of a p-n junction or a diode, they usually do not talk about metal contact...
2 comments posted 19yrs
posted by victor.fay
2 comments posted 19yrs posted by victor.fay

sizing a freewheeling diode for a coil

I am controlling the coil of a relay using a switching transistor. To protect the transistor I intend to use a freewhee...
37 comments posted 19yrs
posted by themattfella
37 comments posted 19yrs posted by themattfella

Current - vs - Voltage

Hi all, This has been burning in the back of my mind for quite some time, and I've not been able to come up with an obv...
7 comments posted 19yrs
posted by sbrehler
7 comments posted 19yrs posted by sbrehler

-5v and -12v Serial Ports

Hi All, A buddy of mine got a new computer, replacing his old 486. He uses his computer's serial port to "talk" to olde...
10 comments posted 19yrs
posted by bborb
10 comments posted 19yrs posted by bborb

variable HF oscillator

I need to vary the frequency of operation of a transceiver IC from 7MHz to 9MHz. The oscillator needs to feed into the...
3 comments posted 19yrs
posted by cjnelson
3 comments posted 19yrs posted by cjnelson

how to interface a pressure meter?

Hi all, I hoped someone might be able to give me some advice about how to interface a pressure meter I have borrowed. I...
4 comments posted 19yrs
posted by spam.ontoast
4 comments posted 19yrs posted by spam.ontoast

Need Help with LED Circuit for Poker Table

Hi ... I have built a poker table that seats 10 people. The table has 10 chip wells for the players and it is the chip...
2 comments posted 19yrs
posted by steelertimp
2 comments posted 19yrs posted by steelertimp

Switching AC w/ Logic Level

I've found a few threads but nothing with exactly looking for what I'm looking for. I need to switch 24VAC (HVAC contro...
3 comments posted 19yrs
posted by jecottrell65
3 comments posted 19yrs posted by jecottrell65

Random timer!

Hi Guys, I'm looking for ideas here. I am trying to figure out how to make a random interval timer! Something that will...
30 comments posted 19yrs
posted by baron.nospam
30 comments posted 19yrs posted by baron.nospam

Opamp preamplifier design question

I'm working with these microphones because I have them already: http://www.knowlesacoustics.com/knowlesacoustics-apps/m...
17 comments posted 19yrs
posted by mr.whatever
17 comments posted 19yrs posted by mr.whatever

Calculating Input Noise Voltage

I was just checking out various opamp datasheets. I encountered this opamp: http://focus.ti.com/lit/ds/symlink/tlv2784....
3 comments posted 19yrs
posted by mr.whatever
3 comments posted 19yrs posted by mr.whatever

Logic circuit educational project

I just showed my son (13yrs) logic gates, and, or, nand, nor, xor, etc. I'd like a few simple problems to solve using l...
2 comments posted 19yrs
posted by amdx
2 comments posted 19yrs posted by amdx

Positioning a FAX and an Answering Machine

It appears that a FAX machine wants to be first in line when using the two devices in Subject. Is there some way of cha...
7 comments posted 19yrs
posted by wolf_tracks
7 comments posted 19yrs posted by wolf_tracks