Roland System 100 brochure

Roland System 100 brochure

Ages ago I’d read that there were originally going to be more modules in the original Roland System 100 series, but nothing further was released (probably in Gordon Reid’s excellent History of Roland)

I hadn’t seen anything more about this until I spotted this brochure on eBay (long gone now) for the original units, with the following:

Also planned for the near future are: Audio Delay unit, Stereo Phaser, VCO bank, and other units.

…so maybe, 105 Audio Delay, 106 Stereo Phaser and 107 VCO Bank?

I could imagine the delay and the phaser being similar circuits to the equivalents in the 700, but I can’t think how they would have been designed to stack up on the System 100 – the top of the 102 isn’t particularly deep. Maybe this was part of the reasoning that led them to design the 100m?

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ba662 tall clown arrives

clown comparison

Having given up trying to hand solder the SOT-363 bits on the OpenMusicLabs BA662 clone/clown, here’s a version with BCM847DS/BCM857DS transistors instead of the dust-like PMP4201/5201.

No idea if it’ll work. The specs look almost identical, apart from a tighter hfe tolerance on the smaller device which I don’t think will matter anyway.

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703e VCF with LM13700s

Someone asked on electro-music about subbing a LM13700 for a couple of CA3080s in a Roland-style filter, so I thought I’d have a go. I levered out the 3080s in my 703e clone and wired up three LM13700s (two for the four poles, one-half for the resonance control) and to no-one’s great surprise, it works.

Here is some quick fiddling with an out-of-tune clone 700 oscillator into the 703e VCF.

It sounds a bit overdriven to me – I was trying to avoid any red lights, but being in a hurry to get something down it’s possible I got something wrong along the way.

Now I think about it, it could be that I didn’t recalibrate the DC offset trimmers from when it was set up with the 3080s.

The wires strewn all over the board probably aren’t helping either, so I’m tempted to build up another 703e and make some LM13700-to-CA3080 adaptors to test this further.

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