Advertisement
Q
18. Install R20, 10K ohm [brown-black-orange]. You've now completed
the AM envelope detector. This circuit removes the audio information
from the IR carrier.
19. Install R15, 10K ohms [brown-black-orange].
20. Install R13, 100K ohms [brown-black-yellow].
21. Install R12, 1K ohm [brown-black-red].
22. Install Q7, 2N3904 transistor. Notice that the flat side faces R20.
23. Install C15, .1 pf disc capacitor [marked .1 or 104]
24. Install C8, 2.2 uf electrolytic capacitor. Electrolytic capacitors are
polarized and must be installed correctly. They are usually marked with a
black stripe and a ( - ) indicating their negative lead, while PC boards
will usually indicate the (+ ) hole.
O000
00
25a. Next we'll install the LM 386 audio amplifier IC. Use care when
inserting the IC into the circuit board, so as not to bend one of the pins.
This prevents it from passing through the circuit board. Note also that
one end of the IC is marked by a dot, notch or band; this end MUST be
oriented as shown on the PC board layout diagram.
O
25b. Install C6, 220 uf electrolytic capacitor. Check to make sure the
polarity is correct.
26. Install R18, 2 ohm [red-black-gold]
~
27. Install C7, 220 pf electrolytic capacitor, Check to make sure the
polarity is correct.
28. Install C11, .1 pf disc capacitor ecg -1 or 104]
29. Install C9, .01 pf disc capacitor [marked .01 or 103 or 10nf]
Ge
Oo.
CONGRATULATIONS
Your IR light beam receiver is completed! Take a minute to step back and
have a look at your work. If you have the patience, we suggest a short break.
Then, take a magnifying lens and a bright light and examine all your solder
joints, touching up any connegtion which appears less than perfect. Make
sure all excess leads have been trimmed, and that there's not one bent back
flat against the board, probably causing a short, Brush the solder side of the
board with a stiff brush to make sure that no loose wire trimmings or solder
drippings (tsk tsk) are lodged between connections.
Now we'll install the battery and/or power supply connections. If the kits were
separaied omit these steps and pick up after step number 33.
LB-56 ¢10
-
Advertisement
