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Presetting unit for VHF-FM receiver

If you want to make a VHF-FM receiver, usually take K174HA34 chip or some of its analogue, and collect the receiver on the template with electronic adjustment variable resistor. Many stores have electronic components constructor sets, representing a packet of the printed circuit board and a set of parts for… Continue Reading

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Radio microphone

I would like to draw to the attention of radio amateurs and little-known simple scheme Microphone. The figure shows a schematic circuit diagram of the transmitter, which comprises K155LA3 chip and the capacitor C1 2…24 pF, determining the operating frequency. Power wireless microphone carried by the voltage source 5 AT, but to work… Continue Reading