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dc_102019.pdf
QRPGuys K8TND Direct Conversion Receiver
for 80m or 40m or 30m or 20m
First, familiarize yourself with the parts and check for all the components. If a part is missing, please
contact us at
and we will send you one.
Please read all the instructions before starting to assemble the receiver.
We supply the components for the 40m version. At the end of page 4 there is a table of suggested
values for other bands for those that want to experiment. They are suggested values, and may need
some tweaking for optimum performance
Parts List
1 – Receiver pcb
1 – U1, 78L09 regulator
1 – U2, NE602 or NE612 DIP8 IC
1 – U3, LM386 DIP8 IC
1 - Q1, 2N3904 transistor
1 – D1, 1N4007 diode, black, silver band on one end
1 – D2, 1N4737A, 7.5V zener diode, small glass, black band on one end
2 – D3, BB910 varactor diode
1 – D4, clear lens, red led
1 – D5, high intensity green led
2 – R1,6, 10 ohm resistor (brown-black-black-gold)
1 - R2, 47K resistor (yellow-violet-orange-gold)
2 – R3,9, 220 ohm resistor (red-red-brown-gold)
1 – R4, 22K resistor (red-red-orange-gold)
1 – R5, 390K resistor (orange-white-yellow-gold)
Содержание K8TND
Страница 7: ...Page 7 of 8 dc_102019 pdf Schematic...
