This electronic schematic circuit is a test circuit for audio, diode and circuit. This very handy simple solid state battery operated tester. It works on two 1.2-1.5 AA-batteries.
This three in one tester can be used for :
audit AF/LF signal
circuit tester
diode tester
1 KHz tone generator
When you switch S1 OFF the diode/circuit testerschematic can be used.
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