FM Wireless microphone kit. Transmits mono FM from 88-108MHz. Batteries not included.



In stock: 100

Price: $3

FM Wireless microphone kit. Transmits mono FM from 88-108MHz. Batteries not included.

PartNo: kit-fm-mic

Brand: Tech America

MPN: 990-0191

Category: pcb

Weight: 1.5oz

Condition: new old stock

Additional Description: Theory of operation: the FM Mic Kit consists of two stages. The first stage uses a 3.3kohm resistor to bias the microphone. A 0.1 microfarad capacitor isolates the microphone from the base voltage of the transistor, allowing only AC signals to pass. The second stage consists of a BC547 transistor, a coil, a variable capacitor and a 470ohm resistor which form an oscillator circuit. The oscillated frequency can be adjusted by the variable cap from 88 to 108MHz

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