A HOMEBREW BEAUTY:
THIS IS THE CIRCUIT AS USED IN
THE CRYSTAL TESTER PROJECT.
originally from: http://www.keirle.fsnet.co.uk/xtal.htm
BC182 substitute :
2N2222
NTE123A
OVERALL VIEW :
Note the push switch to "test", the "OK" LED and the handy
"press in" speaker terminal for the test crystal leads.
Also, 9v battery holder and leads.
THE GUTS:
Here is an inside peek at the PCB and the dremel tool cuts
for the pads. A rather quick and dirty way to make a PCB
without traces and etching.
All components stand on the copper side of board.
Works FB!
Bonus: no ferric chloride stains!
VIEW FROM ABOVE:
Another
look at the the project showing the top view.Bonus:
BNC output to your frequency counter for exact crystal status.