This is a schakeling HF make indicator.
The schakeling uses for this a crystal. The kristaloscillator work rather simple.
The schakeling around T1 and X1 ensures the HF indicator. T2 the indicator reinforces then.
There can be used crystal from 100 kHz to 10 MHz and the feeding tension must lie between 1.5 and 10V.

Budget :

This schakeling costs approximately 2,70€.

• R1 = 4,7 MW
• R2 = 220 W
• C1 = 1 nF
• C2 = 22 nF
• T1 = BF 256
• T2 = BC 147B
• X1 = cristal 100 kHz - 10 MHz
• L1 = 1 mH

(Posted Jeroen Vreuls on Thursday 4 April 2002 17.13)

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