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A high power audio amplifier circuit which can output up to 240W on a 4Ω speaker.
This mosfet amplifier is built with BUZ23 and uses a 40V symmetrical power supply. Connect the NTC close to the heatsinker.
A rf field indicator is required to verify power stages and transmitters antennas. With this radio field indicator you can measure radiated energy from antenna. This circuit is very sensitive, a weak signal is enough.
The S2 commutator allows to select : 480KHz … 2.4MHz / 2.4MHz … 12MHz / 12MHz … 40MHz.
A 30cm long wire is enough as a antenna.
One wideband fm power amplifier designed with MRF 171A MosFet transistor. The output rf power is somewhere around 40W , the gains is 20dB ( 100 X ) . The input rf power is 400mW.
300W 144Mhz push pull power amplifier with MRF141G MosFET transistor.
144MHz 300W schematic
