Ramsey Electronics QAMP30 manual QAMP-30

ˆ16. Install diode D4, 1N4002 style black epoxy diode. Check positioning of the banded end.

ˆ17. 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.

ˆ18. Install C13, .1 µf disc capacitor (marked .1 or 104).

ˆ19. Install L4, 10 µH inductor (green body with brown-black-black bands).

ˆ20. Install R3, 10 K ohm resistor (brown-black-orange).

ˆ21. 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.

ˆ22. 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.

ˆ23. Install R5, 1 K ohm resistor (brown-black-red).

ˆ24. Install R2, 6.8 K ohm resistor (blue-gray-red).

ˆ25. Install R1, 1 K ohm resistor (brown-black-red).

ˆ26. 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.

ˆ27. Install R8, 270 ohm resistor (red-violet-brown).

ˆ28. Install C11, .001 µf disc capacitor (marked .001 or 102).

ˆ29. Install R9, another 270 ohm resistor (red-violet-brown).

ˆ30. Install C12, another .001 µf disc capacitor (marked .001 or 102).

ˆ31. Install C8, .1 µf disc capacitor (marked .1 or 104).

QAMP-30 • 8