Arp 2612 Filter in MOTM

Muffwiggler link: http://www.muffwiggler.com/forum/viewtopic.php?t=121124&postdays=0&postorder=desc&start=80

Building guide:   2612_BuildDoc.pdf

i go forward to use a 2n3958 like the original instead of 2x2n5459, in building guide " there are markings for usage of 2n3958"

Parts/BOM  (listed only non standard parts)

pcb (control and main pcb from steffcorp

1x tempco 1k87

2x 1n5817

1x lm301 dip8

4x 3k32

1x 23k2

1x 196k

2x 250R trimpot multiturn or 500R trimmer

1x 10k trimpot multiturn

1x 100k trimpot multiturn

Panel 4072 panel from Bridechamber.com, you have to leave the fine tune pot

Description

copy from https://steffcorp.se/product/2612/

This is a clone of the 4012 VCF used in the ARP 2600.
Other than some substituted parts and a “sandwich-layout” mainly adjusted for the eurorack standard, I have tried to keep all the original quirks as close to the original as possible.

The “sandwich-layout” simply means the VCF is split in 2x PCB’s mounted in parallel on top of each other.
The Core-PCB contains the main circuit, while the Control-PCB contains the controlling elements as well as the buffers.

See the Build-Document for more detailed info/options regarding the build.

Main controls:

• Frequency & Fine-tune

• Resonance

• Attenuators for Audio and FM inputs

Inputs:

• 2x Audio

• 2x FM

• 1V/OCT

Outputs:

• Lowpass output