Instruction manual

FMLP1 • 13
 7. Install C7, 27 pF chip capacitor (marked L1)
 8. Install C8, 12 pF chip capacitor (marked C1)
 9. Install C9, 10 pF chip capacitor (marked A1)
 10. Install C10, 10 pF chip capacitor (marked A1)
This completes the first phase of construction of your FMLP1. Take a break
now to carefully examine all solder connections. Make certain there are no
solder ’blobs’ or small shorts on or around the components you have just
installed. It’s much easier to find a problem now, before all the parts are on the
PC board. Now the all of the SMT capacitors are in place, lets move on to the
coil winding phase.
Inductor Coil Winding and Placement
The next few parts need to be handmade! That’s right… we are now going to
build our own coils. It is important to follow the next few instructions to the
letter in order to achieve proper performance of the final product. All three of
our coils will be surface mounted. This means there are no holes in the PCB to
insert the end leads. Each coil will be wound, tinned, and then finally installed
in a similar manner as that of the SMT capacitors. Let’s go...
 11. Wind L1, a 4 turn inductor. Use the #20 AWG enameled wire and
wrap four turns with the groves on the provided 1/4”-20 bolt. This method
gives you beautifully formed coils with precalculated inductance values.
The coil will appear to have 4 complete turns if viewed from the top. The
excess wire will be turned out at a 90 degree angle and clipped to about
1/8
th
of an inch long to provide us with suitable mounting leads.
 12. Wind L3, another 4 turn inductor the same way as L1 above.
 13. Wind L2, the five turn inductor in the same manner as L1 and L3 but
with one more wrap of wire. Look at the above diagram for reference.
 14. Tin the ends of the coils to give them a good solder contact. This is
done by melting a little solder on the end of your iron and rubbing the 1/8
th
of an inch long ends left for mounting the coil with the soldering iron. The
enamel will burn off giving you a clean contact to solder to the board. Spin
the coil back on the bolt before tinning the leads so you don’t your fingers!
4 TURNS
(SIDE VIEW) (ANGLE VIEW)
5 TURNS
(SIDE VIEW) (ANGLE VIEW)