EFM VCF 7b Quick start guide

VCF 7b - 4 Pole 3900
Voltage controlled filter based on Arp
4072
●4 Pole LP LM3900
●+/-12 or +/- 15V
Assembly
●Press the overlay on the panel blank
●Drill and clean the holes
●Remove the application tape and cutouts
●Mount the jacks, switches, pots ect... to the panel.
●Install the (1) jumper. (Shown as a solid black line)
●Install the resistors
●Install the IC sockets
●Install the capacitors
●Cut and solder header strip pins in pads used to connect wire to the board
●Plug the ICs into the sockets
●Mount the L-Brackets to the board with 440 screws and nuts, using the non threaded end of the bracket
●Mount the board to the panel with 440 screws using the threaded end of the bracket

●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