Hobby Electronics Basics

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Microwave diode?

Have simple detector circuit that specifies 1N21B diode. That diode is 20-plus years old and obsolete. Looking for curr...
22 comments posted 17yrs
posted by me
22 comments posted 17yrs posted by me

RFID chips

Does anybody know of a way to de-active(blowup) RFID chips? Can their receiver coils be overloaded? Those things get add...
36 comments posted 17yrs
posted by burrynulnulfour
36 comments posted 17yrs posted by burrynulnulfour

loudspeakers

I have a query about two loudspeakers acquired from different companies. One speaker is larger and sounds better (softe...
4 comments posted 17yrs
posted by kvsteve
4 comments posted 17yrs posted by kvsteve

Amplifier lamp replacement

I have an old stereo amplifier in whch some of the indicator lamps have blown. Unfortunately two of these are enclosed...
24 comments posted 17yrs
posted by the1930s
24 comments posted 17yrs posted by the1930s

About ADC

I have not understand some definition used with adc... 1)what is ENOB?A 12 bit adc with enob equal to 11 bit means that...
3 comments posted 17yrs
posted by silusilusilu
3 comments posted 17yrs posted by silusilusilu

Part identification

I found this old part in a controller of this elevator modernization I am doing, and I am wondering what it is. Google...
1 comments posted 17yrs
posted by kmvgroups
1 comments posted 17yrs posted by kmvgroups

Need help with basic Oscillator design

I have some electronics theory questions and some electronics simulator questions pertaining to an Armstrong oscillator...
5 comments posted 17yrs
posted by jalbers
5 comments posted 17yrs posted by jalbers

Building adapters

Many times over the years I have wanted to make an adapter from one jack to another. Inevitably I end up wondering if I...
1 comments posted 17yrs
posted by greg1
1 comments posted 17yrs posted by greg1

Mains AC motor speed control

I am playing around with a couple of CNC mills. One is a tiny HDPE thing with a Dremel 300 series drill and the other a...
3 comments posted 17yrs
posted by Periproct
3 comments posted 17yrs posted by Periproct

Insulators

I bought a big potted neon sign transformer on ebay, but both of the hv insulators were destroyed in transit (this is m...
6 comments posted 17yrs
posted by robertmonsen
6 comments posted 17yrs posted by robertmonsen

What range should my POT be?

Okay, so I have this motor and it is powered by a 24VDC power supply, and I would like to vary the voltage going to thi...
23 comments posted 17yrs
posted by kmvgroups
23 comments posted 17yrs posted by kmvgroups

Radio

Hey,I just want peoples opinion about what shortwave radio I should get that is in the price range of $500.
5 comments posted 17yrs
posted by smbexx
5 comments posted 17yrs posted by smbexx

Broken mouses

I have 2 broken PC mouses, one is optical, one is PS/2. What can i do with the circuit inside that 2 broken mouses, some...
2 comments posted 17yrs
posted by ltdk1404
2 comments posted 17yrs posted by ltdk1404

binary clock power circuit

hi i build a bcd clock shown in the page http://ourworld.compuserve.com/homepages/Bill_Bowden/clock.htm and all the cir...
7 comments posted 17yrs
posted by josegidayfin
7 comments posted 17yrs posted by josegidayfin