Fig. 1 - 2.5KM FM transmitter, using transistor 2N3866 with PCB This is a simple  FM transmitter , with great range, being able to reach more than 2.5 km of distance, using a suitable antenna, powered by a power supply or a 12Vdc battery. The circ…

Fig. 1 - 14V 4 Channel 200W MOSFET Quad Bridge Power Amplifier using TDA7850 with PCB This is a  14V 4 Channel 200W MOSFET Quad Bridge Power Amplifier , it uses an  TDA7850 Integrated Circuits , in  Quad   Bridge Mode  to drive four power speakers. …

Fig. 1 - 140W Class AB Amplifier using MJL4281A and MJL4302A transistors with PCB This is a simple 140W Class AB amplifier using MJL4281A and MJL4302A transistors , which stands out for its simplicity, quality, and is a moderate amplifier to build. …