Ramsey Electronics FX-440 Manual page 128

[ ) [ ) M15: C89: .001 uf.
[ I [ I
M16: C24: .001 uf.
[ ] ['~, M17. Install U4, a 14 pin DIP IC, type LM324, which
· · contains all 4 op amp sections of this circuit. Orient the notched
end as shown on the board. If you elect to provide a DIP socket,
use the same care as for soldering the IC itself.
[ ) [/(\] M 18. Install 011, N PN transistor type 2N3904.
\ ' Be sure to orient flat side as shown.
[ ] [}f\,
M19. Identify and install R46, the yellow color modulation control
{ ftimmer potentiometer. It differs from trimmer capacitors by having
three terminals. Simply place it in position and solder all three
points.
NOTE: The remaining three transistors used in this section are PNP
types, 2N3906 or similar, marked 228256. It is ESSENTIAL to use the
correct transistor type for 012, 013, 014.
[ ) [ i\
M20. Install 012, PNP transistor type 228256. Orient flat side as
shown. ·
] ,[ L
M21. Similarly, install 013, PN P type 228256.
[ ) [ }·· M22. Install 014, PNP type 228256.
Install the following additional parts:
[ ) [ :) , M23: R60, near 012, 1 OK (brown-black-orange).
[ ] l ]
M24: R62, also 1 OK (brown-black-orange).
[ ) f!] M25: R111, near 013, 4. 7K (yellow-violet-red).
[ ] L
I
M26: R40, 1 OOK (brown-black-yellow).
[ ] [ l
M27: R63, 470 ohms (yellow-violet-brown).
[ ] L ]
M28: R64, also 470 ohms (yellow-violet-brown).
[ ] [: I
M29: R112, 4. 7K (yellow-violet-red).
[ ] /hi ·
M30: R39, near 011, 47K (yellow-violet-orange).
'
[ ) [\] M31: Correctly identify zener diodes 011 and 012. They have
·gray bodies with a black cathode band. Install zener diode 011.
Orient the banded end as shown.
;
[ ) [
~\.)
M32: Similarly, install zener diode 012.
Assm. 66
FX-440