8
1)
Build the SI5351A Synth module kit first
Re-read section 4.3 (power supply options) and make
sure you have decided which way to build the kits.
This example assumes you will be installing the
LM317LZ on the ProgRock PCB not the Si5351A Synth
PCB. The components in the yellow square have not
been fitted
– C1, R5, R6 and IC2 in the Si5351A Synth
kit numeration.
Please ignore the solder blobs on the right-hand SMA
socket pads
– just my testing!
2)
Solder IC1 socket
I always fit the IC1 socket first, the 14-pin DIP socket.
The pins are quite delicate and may have become bent
–
just straighten them out, to fit them in the PCB holes.
To avoid confusion or mistakes later, align the dimple at
one end of the socket, with the dimple illustrated on the
PCB. The dimple should be at the end nearest the right-
hand edge of the PCB.
3)
Install voltage regulator components
Here again, I assume that you are using the recommended power supply option, that is, fitting the
LM317LZ voltage regulator on the ProgRock PCB, and using it as a 5V regulator.
Fit components R1, R2, IC2, C1, C2 and C3.
Note that R1 (1K resistor), C1 (0.1uF ceramic capacitor),
and IC2 (LM317LZ voltage regulator) are to be taken
from the components supplied with the Si5351A Synth
kit. It will be necessary to bend the central lead of the
LM317LZ to fit the triangular pad placement on the
board. Align the shape of the LM317LZ body to the
shape drawn on the PCB silk screen.
Don’t mix up the 1K and 3K resistors! R2 (3K, colour
code orange-black-red-gold) is the one right next to the
board edge.
For some reason the silk screen legend for C3 seems to have been missed. C3 is the ceramic capacitor
(0.1uF) right above IC2 in the diagram; between IC2 and C2.
