Microbeetle for FM band. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Microbeetle for FM band. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Audio equipment

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The device, the circuit of which is shown in the figure, operates in the VHF FM range of very high frequencies and can be heard through a conventional radio receiver.

Microbeetle for FM band

An unusual circuit design was used on the integrated circuit 74LS13. A short piece of wire is used as an antenna.

The transmitter has an electret microphone, the necessary bias voltage for it is supplied through the resistor R1. In the case of using a piezoelectric microphone, resistor R1 and capacitor C3 can be omitted. Capacitor C2 is included to improve the performance and sensitivity of the device.

The transmitter operates on the third harmonic within 100 MHz. It will take a bit of experimentation to find the right frequency on the radio at first.

The microbug can be listened to at a distance of up to 20 m. This very simple circuit is highly sensitive and somewhat prone to positive feedback, especially when the device is in the hands. Therefore, the best results are obtained when the transmitter is at a distance.

Author: T.Beckers

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