Vintage Simmons Drums (UK) Users Group

----- Original Message ----- 
From: "EPPHERRE" <raymond.eppherre@...>
To: <Simmons_Drums@yahoogroups.com>
Sent: Monday, November 23, 2009 4:55 PM
Subject: [Simmons Drums] Re: Help required - in other words big ask ahead


> Hello,
> Me two I want to build my own SDS5 analog drum synth....I had a SDS5 brain 
> from ebay 4 years ago and I have redraw schematics from this unit...I have 
> noticed errors on the SIMMONS schematics....
> I think we have to replace the SSM2044 by a discrete filter (like for 
> example on the Tama Techstar with LM13700 otas) and redesign the 
> enveloppes generators to have a cleaner triggering.I think also to replace 
> the Click/Drum balance control by a Click level control (like 
> SDS8,Techstar...)


But but......then it\ufffds no SDS-V

> On my SDS5 I noticed a big DC thump at the output of the SSM2044 filter 
> when applying filter sweep and I don't like it(neither the speakers!)so 
> removing the SSM2044 that filter only noise and replacing with discrete 
> cheap filter will be the better solution.

Is not the amplifier DC-coupled ?

WT