Wednesday, 16 February 2011



The transmitter circuit is made up of two building blocks - the 303MHz RF oscillator and the 32kHz crystal controlled oscillator to generate a tone so the receiver does not false-trigger. The 303MHz oscillator consists of a self-oscillating circuit made up of the coil on the PC board and a 9p (9 puff) capacitor.

1 comment:

  1. So I am very interested in this circuit. Can you explain how the oscillating PCB coil works? Is there a way to replicate this circuit without a PCB coil?