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Unlike many others, represented in the figure the transmitter frequency drift, even when touched by hand, due to the original inclusion of feedback.

When powered 1.5 V range transmitter is 150 metres away, while frequency drift in temperature range -20...+30 deg. With is 500 kHz.

The RF generator is performed on the transistor VT2. High stability is ensured thanks to the introduction of positive feedback ( sequential chain L2C4 ).

Coil L1 consists of 6 turns of wire PEL - 0,53 wound on the frame with a diameter of 3.5 mm; L2 - 3 turns of wire PEL - 0,25 on top of the coil L1.