[sdiy] Synthacon/Steiner-Parker VCF inputs

[Tom Wiltshire]

How about actually putting three input jacks on it nonetheless, and  
then normalling the jacks to ground? That way, you'd be able to use  
more than one input if you wanted, but you could only use one if  
required, and the others would be grounded.

HTH,
T.


On 24 Jun 2009, at 17:31, Derek Holzer wrote:

> I'm using Marc Bareille's PCB for the Synthacon/Steiner-Parker VCF  
> clone. It has separate inputs for the HP, BP and LP inputs and a  
> common output. Since I only intend to use one type of filter at a  
> time, I plan to use a switch to change which part of the filter  
> core the input signal goes to.
>
> However, Marc recommends that the unused inputs are normalled to  
> ground, presumably because of noise (the Livewire version of this  
> filter is in fact extremely noisy, although I don't know how they  
> handled the inputs...).
>
> Originally my idea was to use a DPDT 3 way switch to select which  
> input is used. However, the need for grounding the other inputs has  
> me a bit stumped. Is there a mechanical or electronic solution to  
> this problem? I would prefer something with either a pushbutton or  
> toggle switch, rather than a rotary switch since panel space is  
> already at a premium on this module. (Thus the suggestion of  
> separate input jacks is also out...)
>
> Thanks for suggestions!
> Derek
> -- 
> ::: derek holzer ::: http://blog.myspace.com/macumbista ::: http:// 
> www.vimeo.com/macumbista :::
> ---Oblique Strategy # 25:
> "Cascades"
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