[sdiy] seeking Deltalab DL1 Digital Delay info

MTG grant at musictechnologiesgroup.com
Sun Jun 28 16:51:19 CEST 2015

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
>> 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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