$2,201
pledged of $4,000pledged of $4,000 goal
7
backers
3days to go

All or nothing. This project will only be funded if it reaches its goal by Thu, January 24 2019 1:45 AM UTC +00:00.

$2,201
pledged of $4,000pledged of $4,000 goal
7
backers
3days to go

All or nothing. This project will only be funded if it reaches its goal by Thu, January 24 2019 1:45 AM UTC +00:00.

About

This is your chance to help fund and procure parts for the iconic LinnDrum (LM-2) Drum Machine. This is the second in our series of meticulously designed replacement parts projects for vintage synths & drum machines. This project follows up the completion of the  Oberheim OB-X Parts Project. We've established a low funding goal of $4k to cover the cost of the custom parts to get the project off the ground.

Before getting into the details of the actual parts we'll clearly state what is being offered. We are offering bare PCB's and PCB Assemblies for the LinnDrum (LM-2) Drum Machine:    

  • LinnDrum MXR PCB Assembly
  • LinnDrum CPU Board PCB
  • LinnDrum CPU Board PCB Assembly 
  • LinnDrum CPU Board PCB Assembly (w/o switches)
  • LinnDrum 5VSR PCB Assembly   

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LinnDrum MXR PCB Assembly 

Our LinnDrum MXR PCB Assembly is interchangeable with original parts. This is the control section that houses all of the potentiometer controls (everything except the tempo control). You want this assembly if you've got an old LinnDrum with dirty scratchy pots or other damaged parts. Simply swap out the old part by removing five retaining nuts. No tech experience required.  The layout is the same as the original parts with the following improvements:

  • ENIG Gold PCB surface finish.
  • Double-sided black soldermask
  • Taiwan Alpha Potentiometers (slide pots includes dust guards!)
  • Includes 40-pin IDC DIP connector for plug and plug 
  •  Schematics available for reference.

Please note the prototype PCB Assembly in the pic below shows a different footprint for the smaller 20mm slide pots versus the original LinnDrum parts. Production parts will use the same type of 20mm slide pots as the original machine.  Also, all production slide pots include dust guards.

We are not offering the MXR PCB-only. It is approximately the same cost to simply buy the assembly than it would be to buy the PCB + our customs pots (or other 3rd party pots). 

           Abstrakt Instruments MXR PCB Assembly (partially assembled prototype)
Abstrakt Instruments MXR PCB Assembly (partially assembled prototype)
               Original LinnDrum MXR PCB
Original LinnDrum MXR PCB
MXR Board installed
MXR Board installed

LinnDrum CPU Board PCB

The CPU Board PCB is the main board that houses the Z80 CPU along with the ROM, RAM, latches, switches, LED's, trigger input circuitry and miscellaneous I/O circuitry. 

The layout is the same as the original parts with the following improvements:

  • ENIG Gold PCB surface finish.
  • Double-sided black soldermask
  • Includes 16-pin IDC DIP connector for plug and play 
  •  BOM and Schematics available for parts procurement, costing, & assembly.  

All parts aside from the push switches are easily obtainable. 

        Abstrakt Instruments CPU Board
Abstrakt Instruments CPU Board
      Original LinnDrum CPU Board
Original LinnDrum CPU Board

LinnDrum CPU Board PCB Assembly (w/ switches)

The LinnDrum MXR PCB Assembly is interchangeable with original parts. This board is completely assembled including all parts and connectors including CPU, ROM, RAM, tempo pot, all switches etc.. completely assembled and ready to use as shown. 

Please note the switches are extremely rare, we source them from John Hill of Synhouse. We no longer have any other sources for this part. There is only enough stock for a limited number of boards and the parts are very expensive - this is why the assembly with switches is significantly more expensive..   

Abstrakt Instruments CPU Board Assembly (top view)
Abstrakt Instruments CPU Board Assembly (top view)
Abstrakt Instruments CPU Board Assembly (bottom view)
Abstrakt Instruments CPU Board Assembly (bottom view)

LinnDrum CPU Board PCB Assembly (w/o switches)

The LinnDrum MXR PCB Assembly is interchangeable with original parts. This board is completely assembled including all parts and connectors including CPU, ROM, RAM, tempo pot, all switches etc.. except the switches. ECG switches not included.

LinnDrum 5VSR Power Supply PCB Assembly

This is the board that derives 5V from the primary supply to power all the TTL and CMOS logic. It takes 12V form the primary supply (on DRM board) and steps down to 5V using a modern dc-dc converter IC. It runs cooler and more efficient than the original part. Our new board includes three replaceable Li-ion batteries for the memory backup. 

This part is plug and play, no tech experience required. Simply remove four nuts, unplug old board, and insert the new one.   

  • The original board is often damaged from NiCad battery acid leakage.
  • In some instances the 5VSR board is responsible for an erratic 5V rail that can cause glitches,  lockups, or instances where the LinnDrum does not work properly until it warms up.  

Please note the picture below shows the prototype 5VSR assembly. The production part has minor differences but same overall size and performance.

           Abstrakt Instruments 5VSR Board Assembly
Abstrakt Instruments 5VSR Board Assembly
         Original LinnDrum 5VSR PCB
Original LinnDrum 5VSR PCB

Please note: we currently do not have any plans to re-manufacture the DRM Board (Drum Board). Never say never but it is not in the pipeline at this time. 

Please note: The Kickstarter Rewards format is not very flexible for allowing pledges for varying combinations & quantities of parts. This is the reason for the large number of options. If you are looking to pledge for a certain combination of parts that is not shown please let us know and we can add a Reward category.

Lastly, we have other vintage synth and drum machine parts already designed that we may offer to the synth community. The next parts we may be offering are Roland Jupiter 4 Panel Board assemblies. All four boards have been designed, including the three main panel boards and the bender board. All plug and play. If you would be interested in these please let us know so we can judge interest. 

Risks and challenges

These parts have already completed design verification and are ready to be manufactured. However, the last step of documentation and delivery is not to be underestimated. The risk relates to delivery time. Delivery dates for some may shift depending on the number of parts that are ordered. Assemblies will be delivered in the order of pledge date. With the small number of LinnDrums out there we don't expect delays to be significant.

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