Ramsey Electronics QRP-80 Instruction Manual download pdf (Page 8)

QAMP-80 • 8

 16. Install diode D4, 1N4002 style black epoxy diode. Check positioning of

the banded end.

 17. Install jumper JMP2. Use a piece of scrap component lead wire bent

into a "staple" shape and inserted into the board like a component.

Jumpers act as electronic "bridges" carrying signals over PC board

circuit traces underneath.

 18. Install C13, .1 µf disc capacitor (marked .1 or 104).

 19. Install L4, 10 µH inductor (green body with brown-black-black bands).

 20. Install R3, 10 K ohm resistor (brown-black-orange).

 21. Install C2, 10 µf electrolytic capacitor. Electrolytic capacitors are

polarized with a ( + ) and a ( - ) lead and must be installed correctly for

proper operation. Generally, capacitors have their ( - ) lead marked

with a black stripe while PC boards have the ( + ) hole indicated.

 22. Install D1, 6.2 volt Zener diode (gray body with a black band). This

diode provides a stable voltage which is used to provide bias for the

power transistors.

 23. Install R5, 1 K ohm resistor (brown-black-red).

 24. Install R2, 6.8 K ohm resistor (blue-gray-red).

 25. Install R1, 1 K ohm resistor (brown-black-red).

 26. Locate another 1 K ohm resistor (brown-black-red). Trim back one lead

to a length of ¼ inch. Bend this wire into a small loop as shown. This

loop will act as a convenient point to connect a test probe for setting

the bias voltage. Insert the resistor into the PC board and hold it carefully

while you solder it to the board.

 27. Install R8, 100 ohm resistor (brown-black-brown).

 28. Install C11, .001 µf disc capacitor (marked .001 or 102).

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Ramsey Electronics QRP-80 Instruction Manual Page 8