Parts Layout Diagram - Ramsey Electronics FM25A Assembly And Instruction Manual

and insert back into the can. Make sure L1 is squarely against the top of
the PC board before soldering. Solid installation of L1 is essential to the fre-
quency stability of your transmitter.
16c. Install R8, 47K ohms (yellow-violet-orange).
17c. Install C16, .1 µF disc capacitor (marked 104 or .1).
18c. Install VR2, the 78L02 2.6 volt regulator (TO-92 transistor style pack-
age). Make sure the flat side is oriented the same way as shown in the

parts layout diagram.

19c. Install C11, a 10µF electrolytic capacitor. Orientation!
20c. Install C10, a .001 ceramic capacitor (marked .001 or 102 or 1 nF).
21c. Install R13, 270 ohms (red-violet-brown).
22c. Install C31, .001 µF (marked .001 or 102 or 1 nF).
23c. Install C30, 10 pF disc capacitor (marked 10 or 10K).
24c. Install C32, 10 pF disc capacitor (marked 10 or 10K).
25c. Install C13, a .001µF ceramic capacitor (marked .001 or 102 or 1 nF).
26c. Install Y2, the small silver "can" crystal. Be especially careful when in-
stalling this part as its leads are very small. You may elect to put a small
"dab" of glue on the part to relieve stress and to keep it firmly attached to
the PC board, or use a piece of clipped off lead and form a loop to go
around the crystal and through the holes in the board.
27c. Install JMP1, a 2 pin header. A jumper block will be installed on this to
enable stereo transmission.
RF Amplifier
1d. Install Q3, the transistor marked C2498 (or 2570). The flat side must be
placed as shown on the PC board, facing away from R20. Mount Q3 as
close to the board as possible without forcing it.
2d. Install R20, 10K ohms (brown-black-orange).
3d. JMP2 is the high power jumper, made from a spare piece of component
lead. For normal operation in the U.S., jumper 2 should not be installed
since high power could put you in violation of FCC rules - better to play it
safe initially and see what your range is before you go hog wild.
4d. Install R17, 220 ohms (red-red-brown).
5d. Install C24, .01 µF (marked .01 or 103 or 10 nF).
6d. Install C29, .001 µF disc capacitor (marked .001 or 102 or 1 nF).
7d. Install R19, 2.2K ohms (red-red-red).
FM25A • 14