This is a useful instrument  for works hops. The standard of the produced frequencies is 10 to 1. The basic frequency is produced by a crystal with high accuracy. The circuit is consisted by the oscillator, around the crystal and the frequency divider, which divides to 10. The produced pulses are quadrangular.

R1= 1 Mohms C1-2= 27pF  ceramic Q1=1 MHZ Crystal
R2-8= 100 ohms C3= 100nF 100V  MKT D1= RED LED
R9= 33K ohms IC1= 4584 TR1= BC337
R10= 1.5Kohms IC2-7= 4017

 

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