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. .. A small but nevertheless very powerful FM transmitter. The transmitter circuit consists of three RF stages, and an audio preamplifier. It can be modulated directly from a piezoelectric microphone which comes in the kit or from a preamplifier. It delivers4 Watts of RF power on the antenna. The antenna can be an open dipole or a GROUND PLANE. Suitable power supply is theSMART KIT 1068.Supply voltage: 12-18 VDC.