EFM VCF 7b Schematics
Text of the manual
VCF 7b - 4 Pole 3900
Voltage controlled filter based on Arp
4072
G 4 Pole LP LM3900
G +/-12 or +/- 15V
Assembly
G Press the overlay on the panel blank
G Drill and clean the holes
G Remove the application tape and cutouts
G Mount the jacks, switches, pots ect... to the panel.
G Install the (1) jumper. (Shown as a solid black line)
G Install the resistors
G Install the IC sockets
G Install the capacitors
G Cut and solder header strip pins in pads used to connect wire to the board
G Plug the ICs into the sockets
G Mount the L-Brackets to the board with 440 screws and nuts, using the non threaded end of the bracket
G Mount the board to the panel with 440 screws using the threaded end of the bracket
G Wire the panel mounted parts to the header pins.
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PC Board Wiring
Small Parts
R9,11,13,16,19,21,24,27,29,
30,37,38,39
10K
13
R5
27K
1
R6
33K
1
R7,8,12,14,17,18,22,23,26
220
9
R4,10,15,20,25,31,36
1K
7
R1,2,3,28,30,32,33,34,35
100K
9
C1,2,7
0.1uF
3
C3,4,5,6
470pF
4
Q1-Q10
2N3906
10
U1
LM3900
1
U2
TLO72
1
Full Parts
50K Pot
4
50K Trimmer
1
Knobs
4
Power Header
1
L - Bracket
2
Panel and Overlay
1
