The picture above shows a circuit board layout giving every option that the MOSFET amplifier will use. This board could be built very easily using “Manhattan Construction” or “dead bug” style construction. I have also built it on mass produced prototype boards from Tanner Electronics. Radio Shack and others have similar prototype boards that can be used. Lay out the parts exactly like they are in the circuit diagram.
Build 13 of these and this receiver is almost built. Just add the oscillators (BFO, VFO, and 4MHz), the product detector, the AGC circuit, the audio amplifier, the three filters (TV & FM, Bandpass & crystal), and you are done. These circuits are just as easy or easier to build than the MOSFET circuit.
I have built the MOSFETs “dead bug” style on 2″ by 2″ copper squares with an assembly line like procedure, and finished all 13 in one evening. Trying to put them on a 1″ by 1″ copper square “dead bug” style has not been very successful, because the circuit didn’t have enough room between the input and output and had a tendency to oscillate. The ones I have built spread over a 2″ by 2″ square worked perfect every time.
The output transformer can be a ferrite core to make a broadband transformer, an iron core to make a tuned transformer, or a commercial transformer for 10.7 MHz or 455kHz. Shown is a 455kHz transformer. The extra connections around the output transformer are used to connect a homemade ferrite or iron core transformer.
Read more Source : http://www.pan-tex.net/usr/r/receivers/ra02017.htm
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This entry was posted on Monday, July 30th, 2007 at 8:34 am and is filed under Power Amp MOSFET.
