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Install R4, 22K resistor (red-red-orange-gold)
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Install R5, 390K resistor (orange-white-yellow-gold)
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Install R7,8, 470 ohm resistor (yellow-violet-brown-gold)
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Install R11, not used
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Install L2, 1mH molded choke marked (brown-black-red-silver),
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Install C1,4,8,11,12,13,14,19,21, .1uF mono capacitor marked 104
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Install C9, .001uF mono capacitor marked 102
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Install C3,5,6,7, 100pF NP0/C0G capacitor marked 101
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Install C10, 680pF NP0/C0G capacitor marked 681
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Install C22, 620pF mono capacitor marked 681 for 80m, 120pF mono capacitor marked 121 for
40m, 47pF mono capacitor marked 47 for 30m, and no capacitor for 20m.
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Install D1, 1N4007 diode, black,
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Install D2, 1N4737A, small glass diode,
Installing D3 Varactor diode.
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A single varatcor diode is required for 20/30/40m,
For 80m only, two varactor diodes are required and they are wired in parallel as shown below. Then
solder into the holes for D3.
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Install D3 varactor diode,
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Install D4, clear lens red led,
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Install D5, high intensity green led,
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Install C17, 80pF trimmer capacitor
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Install S1,2, SPDT switch
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Install both 8 pin DIP sockets
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Install U1, 78L09 regulator
match the silver band on the diode with the outline
match the black band on the diode with the outline
Match the outline for the single diode.
match the silkscreened outline
long lead is positive
long lead is positive
do not confuse with resistor
match the silkscreened outline
Page 3 of 8
dc_102019.pdf
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