[sdiy] seeking Deltalab DL1 Digital Delay info

Neil Johnson neil.johnson71 at gmail.com
Sun Jun 28 18:22:38 CEST 2015

I did a google for "Deltalab DL-1 digital delay schematics" and that
site came up on the first page.


On 28 June 2015 at 15:51, MTG <grant at musictechnologiesgroup.com> wrote:
> Really.  I wonder if there is a reasonably decent list of sites that either
> have free PDF downloads or paid ones. I have bookmarked a bunch, but this
> one is new to me too.
> On 6/28/2015 12:03 AM, Adam Inglis wrote:
>> Hey thanks Peter - never seen that site come up before!
>> On 28/06/2015, at 4:59 PM, Ullrich Peter wrote:
>>> Hi!
>>> This site mentions that they have pcb patterns and schematics, price
>>> on request:
>>> http://www.stereomanuals.com/man/rep/d-misc/
>>> Good luck!
>>> Ciao
>>> Peter
>>> Http://www.ullrich.at.tt
>>> ________________________________________
>>> 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
>>> An: *SYNTH DIY
>>> 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...
>>> TIA
>>> Adam
>>> 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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