AM904A FIlter Upgrade (KIT)

DIY KIT | AM904A Filter Upgrade | Build Manual (PDF) | You Tube

 

DESCRIPTION The AM904A Filter Upgrade is a complete kit for upgrading your Behringer 904A VCF module to the original 1968 version from the Moog Modular IIIp. The upgrade requires soldering and electronic component removal. 

Populated KIT This kit consists of an populated Daughter Board PCB, that attaches to the rear of the Behringer PCB with included PCB standoffs. The Daughter Board PCB contains the new high quality polypropylene capacitors, header pins and an IDC 6-way socket for use with an AM904C module. The supplied capacitors are the same type used in the original Moog.

Populated KIT This kit consists of an unpopulated Daughter Board PCB, that attaches to the rear of the Behringer PCB with included PCB standoffs. The new PCB is populated by the customer, using included parts, high quality polypropylene capacitors, header pins and an IDC 6-way socket for use with an AM904C module. The supplied capacitors are the same type used in the original Moog.

For both kits the customer must carefully desolder the original filter capacitors and replace them with header sockets, that are supplied in the kit. Experience of soldering and desoldering is MANDATORY. The frequency cutoff of the VCF needs to be adjusted using the Behringer trimmer, by ear, with no oscilloscope needed.

The upgraded 904A module delivers a faithful reproduction of the 1968 Moog filter with the correct lower capacitor values and a high quality sound. There is a noticeable improvement in filter quality and resonance.

Build instructions are here: AM904A Project Notes V2.0.pdf

  

What is in the kit The kit consists of the following parts;

  

• 4x 1.5uF Polypropylene capacitors (soldered to PCB in populated KIT)
• 4x 390nF Polypropylene capacitors (soldered to PCB in populated KIT)
• 4x 100nF Polypropylene capacitors (soldered to PCB in populated KIT)
• 12x headers, 2 of 3 pins active (soldered to PCB in populated KIT)
• 12x sockets, 2 of 3 pins active
• 3x 11mm PCB plastic M3 spacers
• 1 IDC 6-way socket (if using with AM904C, soldered to PCB)

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PRODUCT STATUS: IN PRODUCTION