[sdiy] seeking Deltalab DL1 Digital Delay info

Ullrich Peter Peter.Ullrich at kapsch.net
Sun Jun 28 08:59:25 CEST 2015


This site mentions that they have pcb patterns and schematics, price on request:


Good luck!


Von: synth-diy-bounces at dropmix.xs4all.nl [synth-diy-bounces at dropmix.xs4all.nl]" im Auftrag von "Adam Inglis [21pointy at tpg.com.au]
Gesendet: Sonntag, 28. Juni 2015 06:50
Betreff: [sdiy] seeking Deltalab DL1 Digital Delay info

About 15 years ago I bought a DL1 from a retiring studio engineer, for
cheap, with no guarantees. It never worked - powered up but no effect.
Sent it to a tech but they had no joy, and they couldn't source a SM
or schems.
I can find no OM , SM , or schematics online or even available in print.
Having a little bit more knowledge and a decent scope these days, I'm
going to have a closer look at it.

Anyone know anything about these?
Apparently they use an interesting delay technique, as outlined by
Craig Anderton below...


 From Musicplayer forums:

"The Echotron used delta modulation, which was basically one bit --
not unlike DSD and SACD (Deltalab was ahead of its time!). Basically,
one bit sampling is interested only in whether the signal is
increasing or decreasing in level. SACD uses a very high sampling
rate, I don't remember the sample rate of the Deltalab effects. But
you changed delay by changing the clock. So, the longer the delay, the
worse it sounded until it eventually got pretty noisy at the low end
of the dial. I believe they had some sort of tracking filter to help
reduce the noise at low clock rates.

The way I got involved with Deltalab was interesting. I reviewed the
Effectron and said it was cool except it got very noisy at longer
delays. One of the marketing guys there called me up and reamed me,
complaining mightily about the review, it wasn't noisy, I must have
gotten a defective unit, I was a moron, blah blah blah. Really annoying.

Then a couple months later, he called back and said that users in the
field and stores had also mentioned the noise. He said "You obviously
know what you're talking about, want to write some applications
guides?" So I did, then I ended up doing some manuals as well as some
demo tapes of different effects. The marketing guy and I became
friends because he knew I was going to tell him the truth, and I knew
he was really passionate about his gig.

Richard DeFreitas, the president of the company, was an extremely
bright guy...I have no idea what he's doing now, but I'm sure it's
interesting. He was also quite musical, which I think helped in the
product design.

A few things led to Deltalab's demise, but as I recall there were some
safety issues with the Effectron Jr. that caused some grief. Also the
CompuEffectron was not as big a hit as they'd hoped (but I still have
mine, heh heh). But the final nail in the coffin was when memory
prices came down drastically. The 1-bit sampling thing used very
little memory, which was why they could produce delay lines so
inexpensively. Once memory became cheap, their technology lost its
formerly very competitive edge.

And that's probably more than you ever wanted to know about
Deltalab ..."
Craig Anderton

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