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  • colin55 commented on amgworkshop's instructable 1 transistor FM spybug11 months ago
    1 transistor FM spybug

    C2 is 10p and not 10nC3 is 15p and not 15n The battery symbol is up-side-downYou don't have any capacitor across the battery. Should be 22nThe 4k7 should be 10k to 22k The circuit has too much inductance and too little capacitance in the tank circuit. The inductance should be 5 or 6 turns and the capacitance should be 47p. See properly designed BUG circuits on Talking website.

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