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