Ramsey Electronics AM25 Bedienerhandbuch PDF herunterladen (Seite 13)

AR1 • 13

 18. Install R4, 47K [yellow-violet-orange].

 19. Install C8, .001 µF (marked .001 or 102).

 20. Install R5, 1K ohms [brown-black-red].

 21. Install R6, 270 ohms, [red-violet-brown].

SA602 LOCAL OSCILLATOR-MIXER SECTION

 22. Install C9, .01 µF (marked .01 or 103).

 23. In installing the SA602 IC, you may think to use an 8-pin DIP socket

rather than soldering directly to the PC board. However, please be aware

that we have seen more service problems due to improper socket

installation than from soldering heat damage to ICs. We recommend that

a socket not be used. Be SURE to orient the IC correctly, with the band

or notch pointed as shown on the Parts Layout Diagram. Install U1,

SA602.

 24. Install C10, a 4.7 to 10 µF electrolytic capacitor, the first of 9 such

"polarized" capacitors used in the AR1. Electrolytic capacitors are usually

marked with a stripe along one edge indicating the negative ( - ) lead,

while PC boards generally point out the positive ( + ) hole. Consult the

Parts Layout Diagram and orient the capacitor correctly.

 25. Install C11, 10 pF (marked 10 or 10K).

 26. Install C12, 27 pF (marked 27 or 27K).

 27. Install R8, 10K [brown-black-orange].

 28. Install C13, .001 µF (marked .001 or 102).

 29. Install R7, 1K [brown-black-red].

 30. Install C15, 4.7 to 10 µF electrolytic, observing correct polarity.

 31. Install R9, 47K [yellow-violet-orange].

 32. Install jumper wire JMP1. Jumper wires act as electronic "bridges"

allowing signals to pass over circuit board traces. Use a piece of scrap

component wire from a previously installed part, bend it into a small "U"

shape, and insert it

as you would a component.

 33. Install L6, This coil must be seated firmly against the PC board.

Mechanical rigidity is important for the stability of the oscillator.

 34. Install D1, BB505 varactor diode (marked BB505). Install it with the

banded end (cathode) pointed towards C14.

 35. Install C14, 27 pF.

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Ramsey Electronics AM25 Bedienerhandbuch Seite 13