Ramsey Electronics manual Assembly Directions, PA1 Parts Layout Diagram

ASSEMBLY DIRECTIONS:

❒1. Simply EXAMINE the PA1 circuit board. Notice which way is up or down in accord with our published drawing. Notice that ALL components are surface-mounted (tack-soldered) to one side of the PC board. There are NO component-mounting holes!

❒2. Taking care that your soldering tip is clean, pre-tin all mounting pads on the board. You are using enough heat if the solder flows VERY easily and remains shiny. That is the only acceptable result. A smooth build-up of solder thickness is fine and will make parts installation even easier.

❒3. The power transistor will be installed as a later step. Right now, simply position it in place and observe how far its flat leads extend toward the input and output pads. Scribe a line into the tinned pads at each end of these two leads as a guide to the amount of pad space required by the transistor. NOTICE THE ORIENTATION OF THE TRANSISTOR'S COLLECTOR LEAD! Set the transistor aside for now, safely.

❒4. In installing the coils leading in and out of the transistor's pads, the idea is to stay on the other side of your marks, so that the transistor can be installed flat and neatly on the board.

❒5a. Examine C1, one of the mica compression trimmers. Neatly re-form the two outer tabs at right angles so they form "feet" which permit the trimmer to sit level in its correct position. Make sure the inner pins do not touch the PC board.

PA1 PARTS LAYOUT DIAGRAM

PA-1 • 6