Figure 1 The circuit was designed to produce a 500mW output power transmitter whose signal modulated by FM using four transistors. Transmitter – an electronic device that can produce or amplify a carrier wave signal, modulates it with a significant signal, and radiates the resulting signal from an antenna which are being utilized in television, telecommunications, and radio Frequency Modulation (FM) – transmits its signal or information over a carrier wave by changing its frequency but it can also be taken into account as a special case of phase modulation where the carrier phase modulation is the time integral of the FM modulating signal 2N3904 – NPN device designed for general purpose low power amplifier and switch applications; extends to 100 mA as a switch and to 100 MHz as an amplifier 7001 (NTE123AP) – a small signal bipolar transistor having an N channel polarity; collector emitter voltage of 40 V; collector base voltage of 60 V; DC current gain minimum of 20; collec...