![]() ![]() It was inspired by Fig 2.101 in EMRFD, the AA3X amplifier,īut there are well documented examples online. The circuit below is an old one, repeated many times. I followed that driver with Fig 2.98, which uses a single IRF510 and generatesĥ watts easily, 10 watts with higher supply voltage. The yahoo EMRFD group and finally got it working. It took meĪ while to get that curcuit to work because I had used a wire wound resistor in one of the emitters by accident. For example theįinal stages in the Gateway 40, which typically drives this amplifier, used Fig 2.93 in Experiemenal Methods in RF Design. My advice is to build straight forward building blocks and test each one to make sure that it is working. In fact, it was harder for me to create the 5-10 watts of drive that this amplifier needs, than is was to build and test thisĪmplifier. I have had my fair share of difficulty with obtaining high Many people build low power equipment and find amplifiers difficult. I found I could work stations inĪbout a 200km radius during the day with 5 - 10 watts, but at night I could work no one at all. I built this amplifier so that I could be heard above the QRN and QRM on 40 meters in the evening.
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