Hobby Electronics Basics

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Swimmer block departure time

First, I'd like you to know that I'm a novice. I want to record the moment that a competitive swimmer leaves a starting...
2 comments posted 21yrs
posted by mm2ps
2 comments posted 21yrs posted by mm2ps

Testing the Laptop's SMBus

Dear all, Before we can do the recelling job on laptops battery pack, we need to test whether the SMBus is still workin...
0 comments posted 21yrs
posted by andre.only
0 comments posted 21yrs posted by andre.only

PC control Sony Ericsson Bluetooth CAR100

Hello All, I am a beginner here. I try to send the same "control code" ( traced ) to CAR_100 (By Sony Ericsson), but it...
1 comments posted 21yrs
posted by bokiteam
1 comments posted 21yrs posted by bokiteam

Isolating serial noise

Can i isolate my pic from my pc's noise by using 2 optocouplers and powering the serial comms from the serial port as i...
5 comments posted 21yrs
posted by chrispol
5 comments posted 21yrs posted by chrispol

capacitor testing question

I have a broken small appliance (food processor) where I think the problem may be with the motor start capacitors. When...
5 comments posted 21yrs
posted by NOSPAM
5 comments posted 21yrs posted by NOSPAM

Whats the proper way to TS a SS guitar amp?

Help is appreciated The Amp is a gibson G20 from '71 original symptoms were low output. (that was last year, now its mo...
2 comments posted 21yrs
posted by etsad
2 comments posted 21yrs posted by etsad

Printed Circuit Boards

Hi, Im looking for a way to print on the top side of a single layer PCB, Displaying R values, box's and other informati...
1 comments posted 21yrs
posted by richard_harris_2
1 comments posted 21yrs posted by richard_harris_2

Delay Ring Indicator on modem

Hi, I'd like to use my modem to wake up my PC, but the modem sets the Ring Indicator as soon as the phone rings. Ideall...
1 comments posted 21yrs
posted by postman
1 comments posted 21yrs posted by postman

Best way to label small project boxes ?

Hi guys, I'm looking for way to label some input and output ports on a small aluminum project box. It doesn't have to b...
18 comments posted 21yrs
posted by joe
18 comments posted 21yrs posted by joe

Fwd: Ham Radio Course

Doing this for a fellow subscriber in another related group... With the crossbreeding of amateur (ham) radio operators...
0 comments posted 21yrs
posted by tom__macintyre
0 comments posted 21yrs posted by tom__macintyre

Basic electronics

Hi, Current is directly proportional to Voltage. E=I There for I=E, E=9V, I=9A ? If this is so, how come you can get a...
4 comments posted 21yrs
posted by richard_harris_2
4 comments posted 21yrs posted by richard_harris_2

LM317M

Hi all, I have a dead Yamaha soundcard with an LM317M chip, and the chip has the middle leg missing.. just wondering is...
3 comments posted 21yrs
posted by invalid
3 comments posted 21yrs posted by invalid

"Induction Balance" coil tuning

We have a circuit that is a 50kHz 'induction balance' metal detector. Two transmit coils that canel each other out and...
2 comments posted 21yrs
posted by nospam
2 comments posted 21yrs posted by nospam

What is B+ power?

what is b+ power? i can't find definition or origin of b+? please explain to me..
10 comments posted 21yrs
posted by trimir
10 comments posted 21yrs posted by trimir

Time Dealy Circuit

Hi, I need a circuit that activates on a 60 second delay, the input must be 9v battery and the output device requireds...
20 comments posted 21yrs
posted by richard_harris_2
20 comments posted 21yrs posted by richard_harris_2