[sdiy] seeking Deltalab DL1 Digital Delay info

[Adam Inglis]

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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