Cookie Information, please respect my cookie handling while usage this website, or close this session. click here
Skip to end of metadata
Go to start of metadata

use the insert field for macros like gallery..  attachments and more



feel free to include my site ARP 3260 Keyboard Clone

by usage  the include function (macro function)


like this: (in edit mode you can edit or delete my following include function)


Projecttitel: ARP 3260 Keyboard Clone


Startdate: October 2014

Duedate: April 2015

Manufacture link: -


This is a direct copy of the original ARP 3620 electronics so requires a similar keyboard arrangement - 4 octave (49-key) with two independent contacts per key, with the CV bus contact bent slightly to make momentarily before the gate bus contact (to prevent the previous note triggering in error on a subsequent keypress). You could use a 3-octave by placing a 1K2 precision resistor at one end of the CV resistor chain to make up the total 4k8 (48 x 100R).

I used a new keyboard assembly from Kimber Allen in the UK with twin gold contacts, and I know at least a couple of others building this have ordered the same. It is a little pricey though at £296 + VAT.

Other choices would be an old keyboard pulled from a scrap organ, and again Kimber Allen keyboards are a very popular choice for those too - they have been making organ parts since 1928.

I've attached the information pack which includes the original service manual etc. The schematic drawings shows how the key contacts should be wired, but if in doubt please ask.

Groupbuy for Panel and pcb:


You need the PCB and Panel from muffwiggler groupbuy, a keyboard, Case and parts from BOM (resistors, capaciators, semis, switches, pots, jacks and more)

The total costs are around 700€ depends on costs of case and keyboard

Documents for Controller:

  File Modified
Microsoft Excel Sheet ARP 3620 BOM.xls Oct 10, 2014 by LED-man
PDF File ARP 3620 Keyboard Owners Manual.pdf Oct 10, 2014 by LED-man
PDF File ARP 3620 Rev 1 - PCB.pdf Oct 10, 2014 by LED-man
PDF File ARP 3620 Service Manual (scanned original).pdf Oct 10, 2014 by LED-man
PDF File ARP 3620 V2 - Project.pdf Oct 10, 2014 by LED-man
PDF File Panel (inc dimensions).pdf Oct 10, 2014 by LED-man
PDF File ARP 3620 Rev 0 - PCB.pdf !!! only for Rev.0 (3 Users) !! Oct 13, 2014 by LED-man

Documents for Case:



6pol jack/plug:

    • B 606
    • Mikrofon-Einbaustecker f. Funkgeräte, 6-polig
    • 0,63*

    • M 606
    • Mikrofon-Kupplung f. Funkgeräte, 6-polig

    • 0,66*



ResistorsValueToleranceTypeSourcePart #Notes
R139.2k1.00% Mouser660-MF1/4DCT52R3922F
R233.2k1.00% Mouser660-MF1/4DC3322F
R31k1.00% Mouser660-MF1/4DCT52R1001F
R410M1.00% Mouser660-RK1/4DCT52R1005F
R5100k1.00% Mouser660-MF1/4D52R1003F
R6100k1.00% Mouser660-MF1/4D52R1003F
R7100k1.00% Mouser660-MF1/4D52R1003F
R8100kLINTrimmerMouser652-3362P-1-104LFWiper terminal needs bending to fit pad on first version of PCB – OK on Rev1
R9390k1.00% Mouser660-MF1/4DCT52R3903F
R1039.2k1.00% Mouser660-MF1/4DCT52R3922F
R11500RLINTrimmerMouser652-3362P-1-501LFWiper terminal needs bending to fit pad on first version of PCB – OK on Rev1
R129.76k1.00% Mouser660-MF1/4DC9761F
R13500RLINTrimmerMouser652-3362P-1-501LFWiper terminal needs bending to fit pad on first version of PCB – OK on Rev1
R149.76k1.00% Mouser660-MF1/4DC9761F
R1510k1.00% Mouser660-MF1/4DCT52A1002F
R161k1.00% Mouser660-MF1/4DCT52R1001F
R171k1.00% Mouser660-MF1/4DCT52R1001F
R18470R1.00% Mouser660-MF1/4DCT52R4700FNot in original design – used for LED chain – increase value to dim if necessary
R191k1.00% Mouser660-MF1/4DCT52R1001F
R2010M1.00% Mouser660-RK1/4DCT52R1005F
R2210M1.00% Mouser660-RK1/4DCT52R1005F
R23100k1.00% Mouser660-MF1/4D52R1003F
R24100k1.00% Mouser660-MF1/4D52R1003F
R25100k1.00% Mouser660-MF1/4D52R1003F
R2747k1.00% Mouser660-MF1/4DC4702F
R295.6k1.00% Mouser660-MF1/4DCT52R5601F
R3010kLINTrimmerMouser652-3362P-1-103LFWiper terminal needs bending to fit pad on first version of PCB – OK on Rev1
R31150k1.00% Mouser660-MF1/4DCT52R1503F
R321.5M1.00% Mouser660-MF1/4DC1504F
R3310k1.00% Mouser660-MF1/4DCT52A1002F
R3410kLINTrimmerMouser652-3362P-1-103LFWiper terminal needs bending to fit pad on first version of PCB – OK on Rev1
R3568.1k1.00% Mouser660-MF1/4DCT52R6812F
R3610k1.00% Mouser660-MF1/4DCT52A1002F
R371M1.00% Mouser660-MF1/4DC1004F
R38100kLINTrimmerMouser652-3362P-1-104LFWiper terminal needs bending to fit pad on first version of PCB – OK on Rev1
R39500RLINTrimmerMouser652-3362P-1-501LFWiper terminal needs bending to fit pad on first version of PCB – OK on Rev1
R409.76k1.00% Mouser660-MF1/4DC9761F
R4110k1.00% Mouser660-MF1/4DCT52A1002F
R421k1.00% Mouser660-MF1/4DCT52R1001F
R431k1.00% Mouser660-MF1/4DCT52R1001F
R4410k1.00% Mouser660-MF1/4DCT52A1002F
R45100k1.00% Mouser660-MF1/4D52R1003F
R4622k1.00% Mouser660-MF1/4DC2202F
R4710k1.00% Mouser660-MF1/4DCT52A1002F
R4822k1.00% Mouser660-MF1/4DC2202F
R4939k1.00% Mouser660-MF1/4DC3902F
R501M1.00% Mouser660-MF1/4DC1004F
R51470k1.00% Mouser660-MF1/4DCT52R4703F
R52100k1.00% Mouser660-MF1/4D52R1003F
R531M1.00% Mouser660-MF1/4DC1004F
R54100k1.00% Mouser660-MF1/4D52R1003F
R5539k1.00% Mouser660-MF1/4DC3902F
R56100k1.00% Mouser660-MF1/4D52R1003F
R571k1.00% Mouser660-MF1/4DCT52R1001F
R5810k1.00% Mouser660-MF1/4DCT52A1002F
R595.6k1.00% Mouser660-MF1/4DCT52R5601F
R6039k1.00% Mouser660-MF1/4DC3902F
R612.2k1.00% Mouser660-MF1/4DCT52R2201F
R6210k1.00% Mouser660-MF1/4DCT52A1002F
R6339k1.00% Mouser660-MF1/4DC3902F
R646.8M1.00% Mouser660-RK1/4DC6814F
R65100k1.00% Mouser660-MF1/4D52R1003F
R6610k1.00% Mouser660-MF1/4DCT52A1002F
R671M1.00% Mouser660-MF1/4DC1004F
R682.2k1.00% Mouser660-MF1/4DCT52R2201F
R6939k1.00% Mouser660-MF1/4DC3902F
R7039k1.00% Mouser660-MF1/4DC3902F
R715.6k1.00% Mouser660-MF1/4DCT52R5601F
R7210k1.00% Mouser660-MF1/4DCT52A1002F
R733.3k1.00% Mouser660-MF1/4DC3301F
R74390k1.00% Mouser660-MF1/4DCT52R3903F
R751k1.00% Mouser660-MF1/4DCT52R1001F
R7610k1.00% Mouser660-MF1/4DCT52A1002F
R77390k1.00% Mouser660-MF1/4DCT52R3903F
R7833k1.00% Mouser660-MF1/4DC3302F
R80470R1.00% Mouser660-MF1/4DCT52R4700F
R812.2k1.00% Mouser660-MF1/4DCT52R2201F
R8210k1.00% Mouser660-MF1/4DCT52A1002F
R841M1.00% Mouser660-MF1/4DC1004F
R853.9k1.00% Mouser660-MF1/4DCT52R3901F
R8615M1.00% Mouser71-CMF5515M1%T1
R871k1.00% Mouser660-MF1/4DCT52R1001F
R881k1.00% Mouser660-MF1/4DCT52R1001F
R895.6k1.00% Mouser660-MF1/4DCT52R5601F
R901k1.00% Mouser660-MF1/4DCT52R1001F
Gate Bus2.2k1.00%(49-off)Mouser660-MF1/4DCT52R2201FOne per key (49)
CV Bus100R0.10%(48-off)Mouser660-MF1/4DLT52R1000BOne per interval (48). 0.5% or better would probably be OK – and cheaper


Building Documentation:

assembly/solder all resistors, diodes, trannys (make sure your 2n3958 are tested)

i used 12mm spacer for correct placement of switches and fader (same spacer sizing like in TTSH)


KEEP ATTENTION on the correct mounting side of switches, jacks, fader - see pictures as reference

as you can see in the pictures, cut the legs of the switches to mount them