[sdiy] Boss/Roland Dimension C/D differences

[Scott Stites]

I have never experienced a high-pitched squealing with mine (or ever read an account of it on other production models) - it's exceedingly quiet with no input, and with input, no squealing.  Even when listening closely.  You can hear samples other than mine at Modezero, not the same as 'live' I'm sure, but I'd think any squealing would show up on them, too.

www.modezero.com

My BBD's were on separate boards altogether.  I used coaxial cable (shield grounded on one side) to run the compressed signal to each mini-delay board.  Each delay board contained the BBD's, clocks, and pre and post BBD filters, then another coax jumped the delayed, filtered signal back to the expander on the main board.

Without compansion, I'd say all bets were off.  I've never heard of an uncompanded version out there.

Cheers,
Scott


-----Original Message-----
>From: "JH." <jhaible at debitel.net>
>Sent: Apr 17, 2006 2:05 PM
>To: Seb Francis <seb at burnit.co.uk>
>Cc: diy <synth-diy at dropmix.xs4all.nl>
>Subject: Re: [sdiy] Boss/Roland Dimension C/D differences
>
>According to the Boss Book, the Dim C's problem was that the
>two BBD circuits had to be in close proximity, and the two
>clock circuits creating a "sqealing" noise. This has been solved
>with a compander circuit. (paraphrasing)
>
>But ... the Dim D also has a compander circuit.
>Maybe it's cleaner, overall.
>
>Now, it would be interesting if the Dim Cs really have high
>pitched noise, if you listen closely.
>(I haven't - I neither have a C nor D, just a clone.)
>
>JH.
>
>
>
>----- Original Message ----- 
>From: "Seb Francis" <seb at burnit.co.uk>
>To: "Synth DIY" <synth-diy at dropmix.xs4all.nl>
>Sent: Monday, April 17, 2006 2:17 PM
>Subject: [sdiy] Boss/Roland Dimension C/D differences
>
>
>> Well, 1 project almost wrapped up, so it's time to start on another :)
>> 
>> I want to build a clone of the Roland SDD-320 "Dimension D".  I have the 
>> schematics of the Dimension C guitar pedal but I can't find the 
>> schematics of the Dimension D anywhere.  I'm wondering if it's worth 
>> buying the service manual from Roland, or should I just work from the 
>> Dimension C schematics .. are these things essentially the same?
>> 
>> I know the Dimension D has stereo line level inputs as opposed to mono 
>> guitar level input, and it has LED level meters.  But I'm not sure about 
>> any other differences?  Would anyone care to share the schematic of the 
>> Dimension D input stage?
>> 
>> TIA,
>> Seb
>> 
>> 
>> 
>> 


________________________________________
PeoplePC Online
A better way to Internet
http://www.peoplepc.com