22

22



Spy Circuits hUp://\v'^r\v.talkingeleclronics.comprojecLs/Sp>rf/o20Circuit^'Spv,Circui...

shoułd be a coH

whyelectrolytic? shouW be in paratel \ T7Anlenna toolow notneeded K \    T 16Scm


3n3Z: 12k


\




fi

12k

trać* on -L -S PC board

should be near bat tery    ncK needed

not needed



This covers all the possible combinations for the greatest output with three transistors using a 3v to 9v supply.

If you want to improve any of the circuits we have covered, here are some helpful tips:

lt’s handy to know the effective reactance (resistance) of a capacitor at the operating freguency of the Circuit. If we assume 10OMHz, the resistance is as follows:

Capacitance

reactance

@100MHz

reactance

@2kHz

5.6p

300R

10p

166R

22p

75R

47p

35R

7 z9


2008-11-17 20 13



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