Hobby Electronics Basics

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IF frequency

In an avionics book i read that the IF of a reiceiver is 29.05 Mhz. How does that figure come out? Does it come out by...
16 comments posted 20yrs
posted by papageorgiou40
16 comments posted 20yrs posted by papageorgiou40

speed controller

i have a v belt driven woodlathe that i want to change to variable electronic speed control. i dont know if it is singl...
2 comments posted 20yrs
posted by sr004d0524
2 comments posted 20yrs posted by sr004d0524

Electric fence charger

Can you point me in the direction of a plan for an electric fence power supply. Ideally a diagram and a parts list. The...
20 comments posted 20yrs
posted by perilmung
20 comments posted 20yrs posted by perilmung

Relay problem

This could be OT, but I'm posting here to get replies with no baggage.... I have a relay in my boiler which buzzes/arcs...
7 comments posted 20yrs
posted by capnfishytakethisout
7 comments posted 20yrs posted by capnfishytakethisout

Signals of a 5V encoder

Hi, I am going to use a 5V encoder of 600 pulses. The signal it gives me is a pulse train of 5V and it goes to a driver...
4 comments posted 20yrs
posted by helola
4 comments posted 20yrs posted by helola

Using piezoelectric to power a laser diode?

Hi, I'm a complete novice/noob to electronics. I have a little project i'm working on, and would like to use a piezoele...
10 comments posted 20yrs
posted by bobrich
10 comments posted 20yrs posted by bobrich

Alternating relay

Is there a stock item which directs voltage onto one wire the first time it is given power, and then to another wire th...
11 comments posted 20yrs
posted by quakeserver149
11 comments posted 20yrs posted by quakeserver149

removing IR LEDS from board camera

I've a board camera (link below) which has 6 Infra Red LEDs around the CCD sensor. This helps with visibility in the da...
1 comments posted 20yrs
posted by dave23name
1 comments posted 20yrs posted by dave23name

where is fermi energy?

"An n-type sample of silicon has a uniform density Nd= 10e16 atomes cm(-3) of arsenic. Find out the temperature at whic...
1 comments posted 20yrs
posted by patrick.zou
1 comments posted 20yrs posted by patrick.zou

Voodoo 74HC161 counter

Hi, I'm not that knowledgeable in TTL but know enough to get myself in trouble. ;-) I built a very simply TTL circuit t...
1 comments posted 20yrs
posted by pmlonline
1 comments posted 20yrs posted by pmlonline

parts resistors transistors

I cant seem to find these transistors and resistors 4.7K Ohm 1/4-Watt Carbon Film Resistor 5% tolerance NPN 2N222 rated...
12 comments posted 20yrs
posted by tux
12 comments posted 20yrs posted by tux

LED's in tubes?

Can I put a snug, thin, opaque plastic tube (like a straw) around the body an LED to prevent the escape of light except...
8 comments posted 20yrs
posted by cprstn54
8 comments posted 20yrs posted by cprstn54

stepper motor driver

Hi, I'd like to preface this post by saying I know alot about software and little about electronics. Please speak slowl...
3 comments posted 20yrs
posted by revsteban
3 comments posted 20yrs posted by revsteban

Beginer Schematics Needed

Hi! I need to find a simple amplifier schematic for my son's guitar...Loud enough to be heard well but not loud enough...
10 comments posted 20yrs
posted by william_gallagher
10 comments posted 20yrs posted by william_gallagher