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Gear

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Equipment that I've built or modified

G202 cable

G202 cable

To avoid modifying the GR-300, I built a 24 pin cable with DB-25 and used the original Roland 24 pin connector that was mounted on the G-202. I used an old Centronics connector cover to mount the Roland connector.

Base of DIY connector

Base of DIY connector

After drilling the perspex base, even with a drill press, I was off in my alignment…grrr. This was a combination of using a broken 1/32" drill bit, inaccuracy of the Dremel drill press base and that I didn't centerpunch the marked drill holes accurately enough, nor checked the prospective drill hole position sufficiently. Other photos indicate that this level of inaccuracy didn't turn out to be a problem in practice. The edges of the perspex in this photo are pretty rough, due to cutting the perspex with a hacksaw by hand (no bandsaw available). After this photo, I flattened and straightened the edges with a hand file. Some of the edge connector pins and 1" 2-56 bolt for reference. I ended up using a 1/2" bolt as a centre pin.

G202 connector detail

G202 connector detail

Detail of how the connector was mounted in the Centronics cover with some forward mounted screws.

Edge connector pins glued

Edge connector pins glued

Here the edge connector pins have been glued with 24 hour epoxy glue, together with a 1/2" 2-56 bolt and are drying with the pins gently positioned into a female Roland 24 pin connector. I happened to have one spare, but you could use a synth's connector for the alignment. This will compensate for the inaccuracy of the drilling. For the first couple of hours drying, I had set the connector 5mm distance from another piece of perspex, held apart by bolts to ensure the connector pins all extend to the correct depth. The 1/2" bolt turned out to descend the correct depth due to the thickness of the perspex, otherwise I would have cut it down with the Dremel.

After drying, the aligned connector pins

After drying, the aligned connector pins

The pins turned out to align pretty well, despite my poor drilling.

The connector pins side view

The connector pins side view

A side view of the connector, the pins aren't perfectly straight, but the female connector has sufficient play in it to accept them anyway.

Tama Bridge Close Up

Tama Bridge Close Up

A close up view of the RMC piezos installed in the Tama nylon string guitar.

DIY Connector with cover fitted

DIY Connector with cover fitted

The second cable is complete, with the sliding outer cover fitted and held by two side mounted self-tapping screws. Two 3/8" 2-56 bolts secure the connector base to the bent angle. There are some small crystals of epoxy resin on the connector pins.

DIY Connector with GR synths

DIY Connector with GR synths

View of DIY connector, GR-300 and GR-100 in the background.

Connector operational

Connector operational

The connector correctly mounted and working in a very dirty GR-100!

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