Vintage Simmons Drums (UK) Users Group

I can however confirm that switch pedals work on the sds-v, if only to open 
and close (i e killing the decay).

electronically yours, jesper
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www.electronic-obsession.se

----- Original Message ----- 
From: <michael.buchner@...>
To: <Simmons_Drums@yahoogroups.com>
Sent: Tuesday, May 16, 2006 4:10 PM
Subject: Re: [Simmons Drums] Simmons Hi-Hat


> Hi Pigletdad40,
> if you have a tomcard, it's possible to convert it into a hihat. There are
> some empty gaps on the drumboard (card) which must be filled with some
> additional resistors, capacitors and diodes. There is only one eprom
> responsible for both open and close sounds, the pedal regulates decay of 
> the
> vca and triggers also the env generators. The SDS's HH is, by the way, one
> of the best playable and sounding HH's available. Open, close, half, 
> chick,
> stomp, splash, very nice. Invented 20 years ago...
>
> The SDS5/SDS7 pedal itself is constructed around an infrared interrupt
> switch, a H21A1 (Google around for details). It is definately not possible
> to use other pedals without modification. The Hihat XLR of theSDS7 outputs
> 15V on its Pin 3. There is Gnd on Pin 1. And Pin 2 is the input of the HH
> control-voltage. Using switch-pedals will result in shortcut of the SDS7
> brain.
>
> To increase sampling time, you can modify your new HH-card to 64K and
> download the long HH eprom from www.simmonsmuseum.com.
>
> So, if you made your decision to convert a card, I'll give you all 
> details.
> Michael
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