fm transmitter

This circuit provides an FM modulated signal with an output power of around 500mW. The input
Mic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset.
The oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from
two 5pF capacitors and the inductor. [...]

A few designs for remote control switches, using VG40T and VG40R remote control pair, are shown here. The miniature transmitter module shown in Fig. 1, which just measures 34 mm x 29 mm x 10 mm, can be used to operate all remote control receiver-cum-switch combinations described in this project. A compact 9-volt PP3 battery [...]

For the regulation it needs a voltmeter (with needle better) and charge 50W/5W. Connect charge 50W in the place of aerial, with the voltmeter in the exit voltmeter. Be supplied the transmitter with + 12V. It will be supposed we have consumption between 0,7-1A. With a screwdriver we regulate the core of inductor L1/L2 and [...]