Mount the power module to the heat sink as shown below. The little circuit board was etched with a Radio Shack PC board kit 276-1576. Be sure the apply the heat sink grease. The picture below shows the circuit board before connections are attached.
See the schematic below for filter parts list. The schematic is for the entire PA circuit, the filter is only the last part of the circuit. The red arrow points to the one coil you do not have to remove. You must solder a strip across the back of the board where the relay was removed. Pull the same size strip off the board and solder it across the relay. Be sure to use the same size strip to maintain 50 ohms to the RF plug that was left on the board (upper right corner).You must remove the filter shield (see last picture on this page) to access the filter circuit board.
An enlarged view of the picture above
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R1 |
1k - 2 watt Pot |
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Q1 |
NPN TO-220 transistor (use transistor on front edge of heat sink) |
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C3,C4 |
33 µFD@35vdc tantalum Cap Digi-Key Part No.P2102 |
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Dev2 |
Power Module RF Parts # M57774 |
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C5,C6 |
Cap 4700PF 50v Der Disc Digi-Key part No P4057A |
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C1,C2 |
Cap 40PF Part No. J101-40 |
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L1 |
Two turn coil (Strip everything off the filter board except one RF plug, use one of the coils you removed to make the coil) |
