This simple FM wireless microphone transmitter can transmit speech over a short range. It can be used as a simple cordless microphone. The circuit uses two integrated circuits from Maxim. IC1 a MAX4467, is an amplifier raising the microphone signal to a level suitable for frequency modulation (FM). IC2 is a voltage-controlled oscillator (VCO) with integrated varactor (a.k.a. varicap diode). It is this small that can be integrated in a wireless handheld microphone.
27.9 x 13.3 x 5.1 cm
2 AA batteries required. (included)
Manufacturer's Minimum Suggested Age (years)