Tester CrystalsEspecially for amateur radio friends they have in their box components of some crystals and do not know if they are good or bad, here's the fitting room of glass, which will allow them to test them quickly.
All components are easy to acquire, in addition, can be used any type of NPN transistor, is not this tester to give the exact frequency of the crystal, only verify their status to the extent of the deviation of the needle on the meter.
C1: 100 pF. Ceramic 25-volt
C2 47 pF. Ceramic 25-volt
C3: 0.02 µF. Ceramic 25-volt
C4: 100 pF ceramic 25 volts.
Q1, Q2: 2SC828 or 2SC710
M1: Any indication of audio level or other similar.
pcb expensive components print
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