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| I based the circuit around the largest component. |
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| I bent the pins to prepare the IC. This technique involves a lot of thinking ahead. |
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| I first joined the common pins of the IC knowing that this area will not be accessible for much longer. |
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| Every component needed to be prepared before installation. |
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| Occasionally, I had to insulate component leads. |
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| Looking at the schematic, one would expect this circuit to be much larger than a quarter. |
UPDATE:
Shortly after this was featured on Hack-A-Day, I began receiving email asking about this circuit.
This is a revised version of my original DR-110 sync mod. The original design bypassed the internal clock with divided down sync 24 clock signals which were provided by an external master clock device feeding into the 110 via a standard Roland Din Sync (five pin din) port. And, they said it couldn't be done. The schematic above is a revision which also utilizes the incoming Din Sync Run/Stop signal to control the Start and Stop functions on the DR-110. If ever I revisit this project, I'll be sure to use SMD components for an even smaller circuit.
I intentionally made the schematic virtually indecipherable. Why? Back in 1997, when I first developed the mod, I posted the schematic with a full description of how it worked along with the necessary steps one would take to interface this circuit with their 110. My goal was to bring the DR-110 into the studio by enabling it to sync with other gear, as I have done with other devices. After receiving email from musicians asking me to perform the mod on their DR-110s, I eventually decided to do so via snail mail. This was to supplement my funds, or lack thereof, while I was in college. Apparently, the pocket change I earned was enough to gain the attention of a few companies specializing in modding (usually butchering) analog synths. These chop shops used my design to offer DR-110 sync modding as a service. Of course, they based their work off of my original design. Therefore, 110's modded by them lack the ability to utilize the run/stop feature.
So, I'm keeping the revised version of the mod under my hat for awhile. ;) To this day, I still receive email requesting that I perform the mod. Although, I have officially stopped doing that, I did bust a few out for a handful of 110 owners a few years ago. If you had me mod yours after 2004, you have the new revised circuit, shown above, in your 110 right now! So, there are a few "Second Generation" DR-110's floating around out there.
And, if anyone manages to figure out how it works by analyzing the images on this page, then, I guess they will have earned the knowledge.
-Alpha
    
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