Hobby Electronics Basics

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Starting a PC without a Finger

Hello, Any chance someone here has a easy or slick way to start (turn on) a PC with out the use of a human finger?? I a...
10 comments posted 13yrs
posted by royboynospam
10 comments posted 13yrs posted by royboynospam

The Price of Aluminum

I'm in California. Not that it may matter. Does anyone know the price of Al per square foot for 1/4" or 1/8" thickness.
9 comments posted 13yrs
posted by wolftracks
9 comments posted 13yrs posted by wolftracks

Stainless Steel nuts and bolts for Observatory

I finally discovered someone who can put a control system in my observatory. To get prepared for the big day the work b...
17 comments posted 13yrs
posted by wolftracks
17 comments posted 13yrs posted by wolftracks

Heathkit oscilloscope FIXED !!

Heathkit IO-18 Thanks everyone for the help/advice in fixing the above. Problem was the 1 V2 tube. Saw a deal on E-Bay...
9 comments posted 13yrs
posted by ivanvegvary
9 comments posted 13yrs posted by ivanvegvary

Decoupling capacitor choice for 4017 decade counter

Hi all, I've been having some problems with a chain of divide-by-ten counters firin g off prematurely and messing up th...
14 comments posted 13yrs
posted by orion.osiris
14 comments posted 13yrs posted by orion.osiris

Faraday's Law

https://www.youtube.com/watch?v=O5jo9P4-gH4 -- Reply in group, but if emailing add one more zero, and remove the last wo...
7 comments posted 13yrs
posted by tomd_u1
7 comments posted 13yrs posted by tomd_u1

Laptop power supply 20V

The new Lenovo laptop I bought comes with an AC to 20V DC external power converter. Why such a high DC voltage? I would...
3 comments posted 13yrs
posted by source
3 comments posted 13yrs posted by source

Output voltage at Nmos

Hi, I am using Nmos IRFZ44N and STP36NF06L as a switch, opening and closing a c ircuit with 5 volts power suply, a 82R...
2 comments posted 13yrs
posted by d12122749
2 comments posted 13yrs posted by d12122749

HDMI converter

I am in need of a device that will take the HDMI coming out of my Sat receiver and convert it to composite, S-video, or...
2 comments posted 13yrs
posted by footboarder
2 comments posted 13yrs posted by footboarder

HDTV lost

My Polaroid 32" LCD works fine, excepting the HDMI part. I really miss this machine as it had many imput and outputs. Wo...
10 comments posted 13yrs
posted by footboarder
10 comments posted 13yrs posted by footboarder

simple one-shot pulse detector circuit needed

Hi all, I seem to recall from distant memory that it's possible to make a pulse det ector out of two of transistors and...
42 comments posted 13yrs
posted by orion.osiris
42 comments posted 13yrs posted by orion.osiris

Fixing Heathkit Oscilloscope

Picked up the above for $ 10. Fuse was blown. Don't have a 125V 1A fuse b ut used 125V 1/2 amp fuse instead. Front indi...
17 comments posted 13yrs
posted by ivanvegvary
17 comments posted 13yrs posted by ivanvegvary

computing caps in parallel

Is it that one adds up all the caps as fractions? Then the total of all the caps in parallel is the reciprocal of that...
1 comments posted 13yrs
posted by footboarder
1 comments posted 13yrs posted by footboarder