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Unipulse for TR-606
MUFF WIGGLER Forum Index -> Tubbutec  
Author Unipulse for TR-606
gumi
Hi,

I'm interested in the uniPulse for triggering my 606 but your site says additional hardware is needed. What is the additional hardware? Can't I just wire the uniPulse trigger to one of the 606 voice inputs (for example R69 for the bass drum)? I'm handy with electronics so I can probably make it work if you can tell me what I'll need to add. Thanks for any info.
tubbutec
Hi,

the 606 and 808 are kind of specific the way they work internally. The trigger signals come from a common bus and are then 'anded' with a common trigger and accent signal.

At any given moment, even when the 606 is stopped the signal at each voice is either high or low and there is no way of knowing which. So if you supply an external trigger and a common trigger, you usually trigger multiple voices.

Together with a 3rd party we designed a nice little circuit 'the additional hardware' that supplies 'inhibitor signals' when a voice is triggered. It Plugs on the unipulse board and works very well in an 808. It was going to be produced and available in our shop, but so far the 3rd party has not done that unfortunately.

Additional notes: Even with the additional hardware:
- You can not fit the unipulse inside the TR-606, there just is no space.
- You need to signals per voice: one trigger and one inhibitor

Of course if you have a broken 606 and only want to trigger it via midi, you can desolder a few components and trigger it directly with the unipulse
gumi
Thanks for the info! Very helpful and good stuff to know.

I do have a broken 606 (dead CPU) and I just want to trigger the voices via MIDI. Which components would I need to remove from the voice circuits to achieve this? Would I just bypass the transistors on the trigger inputs? For example Q14 & Q15 in the bass drum circuit? I'm just trying to get an idea of how much tinkering I'll need to do before I install a uniPulse.

Thanks again.
gumi
The bass drum circuit for reference:

gumi
Okay I got this sorted. For anyone looking to use external triggers with their 606 you can inject triggers at the PCB locations below (this just bypasses the transistors that control the trigger, I didn't remove any components but more testing needs to be done).

I tested this briefly with the drum gate outs of a BeatStep Pro and it works great. All the 606 voices respond to velocity and gate times. I haven't tested open/closed hi hat muting yet; it looks like we might need to inject a clock signal to get them to mute one another with correct timing.

Thanks again for the help, it looks like uniPulse will be easy to implement here.

TR-606 External Trigger Inputs
Bass Drum - R63
Snare Drum - R98
Low Tom - R312
High Tom - R309
Cymbal - R141
Open Hi Hat - R138
Closed Hi Hat - R133
tubbutec
Yes, perfect!
These are the points I would have recommended as well.
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