555 ASTABLE_FREQUENCY METER

  
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The circuit shown is a simple digital frequency meter, which indicates the frequency in hertz of an astable 555 timer. It could, perhaps, be adapted for other uses. An NPN transistor, TR2, is connected to the 555 astable to be measured, as shown in the in-set, and the output signal obtained is hooked to the main circuit via transistor TR1 collector (c)..
555 ASTABLE_FREQUENCY METER - schematic




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