Oct 052008
Hey man, is this one of those probe things that you were telling me about for checking circuits?
http://parts.digikey.co.uk/1/1/483535-kit-logic-probe-diy-digital-tw-diy-5024.html
i think you said i could make one
would that help me to find problems on my mixer?
thanks
paul
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You are lucky this message got past my filters with that title!
The answer is NO! It’s for testing digital logic gates.
YOU need two sorts of probe….A pair to test static DC voltages at various points in your circuit with a multi-meter….A pair to trace audio through the circuit using a very high impedance hearing aid!
Obviously, one probe in the pair is the reference, say 0V or earth, usually. The other is the bit you want to check against the reference to see what it is. A bit like Einstein, all things are relative!
So in these cases you are testing DC or AC audio RELATIVE to another point in the circuit.
If you just touch one probe somewhere, there’s nowhere for the electrons to go to so you have to complete the circuit to a known point on the board/circuit/equipment/room electrics/universe. It really is relative!
You will see in the photo you linked, that there are two wires. One is the main probe, the other is providing something relative to attach to!
It’s all positives and negatives anyway, digital, audio, voltages… It just depends which way you look at it. Like New Zealand.
THIS is the circuit tester I used for tracing audio!… You can still buy it from Maplin. It’s the best investment you’ll ever make!
http://www.maplin.co.uk/module.aspx?moduleno=3256
Snip the plug off and solder the wires to whatever you like. I had a crocodile clip on one and a bit of thick stiff insulated copper wire with 3mm exposed at the end as a probe. Clip the croc to the case or 0V and trace the audio through the circuit with the phone in your ear. It’s surprisingly effective and you can’t short out a PN junction AT ALL!
The multi-meter you’ve already got!
Hope this helps.
Cool thanks
so i clip 1 bit to case/earth, then starting at the input trace the the wire to output now should it say a steady tone(does the tone alter or get louder?) and if its a bad capacitor/resistor, what will i hear. or will i hear nothing?
im gonna get there you know, even if i have to paint with numbers lol me