4-transistor tracking transmitter:

click here to enlarge schematic

parts:

Transmitter Parts:
R1	100K resistor
R2	10 ohm resistor
R3	47K resistor
R4	220 ohm resistor
C1	4.7uf electrolytic capacitor
C2	0.001uf disc capacitor
C3	10 to 40pf trimmer capacitor
C4	4.7pf disc capacitor
C5	0.001uf disc capacitor
Q1	2N3906 PNP transistor
Q2, Q3, Q4	2N3904 NPN transistor
L1	4-5 turns of 22 ga. magnet wire close wound around 1/8" non-conductive core
Antenna	10-12" hookup wire

Sorry, I don't have any data/instructions for use on this schematic. If anyone knows how this circuit works or is used, please drop me an email at click here or use the feedback form.