Visual modulation indicator

  
Indicator lamp brightness varies in step with modulated RF signal. Adjust R2 with transmitter on (modulated) until the lamp flashes in step with modulation
Visual modulation indicator - schematic

Cl = 5 pf, C2 = 100 pF, Dl = 1N60 or 1N34 (Germanium), R3 - 10 K pot, II = 6-8 V, 30-60 mA incandescent bulb, Q1 = 2N3393 (for increased sensitivity use 2N3392 or other high-gain transistor).




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