Yahoo Groups archive

Doepfer

Index last updated: 2026-04-29 00:15 UTC

Message

Re: [Doepfer_a100] Re: A-165

2014-05-01 by Nicholas Keller

I'm not looking at the schematic, but it seems likely that it is an inverter AND a +5V offset.  Normally, 5V would invert to -5V, but if you follow that with an accurate +5V offset, 5V in becomes 0V out.  This way, it doesn't matter what the first signal is, how long it is, or what color patch cord you use.  There would need to be a rectifier at the front end so that negative voltages are ignored if you were to patch in a square LFO instead of a gate/clock signal 

I'm not a professional, but this might be exactly how it's done.

Nick 

Sent from the future

> On May 1, 2014, at 8:24 AM, <raccoon_boy@yahoo.com> wrote:
> 
> For example if I plug in a jack lets say with gate lengths of 2 seconds that goes: 5v, 0v, 5v, 0v. 
> It will invert this to 2 second gates of 0v, 5v, 0v, 5v. 
> 
> Simple. 
> 
> But if I plug in a jack and the very first signal is a 2 second gate of 0v followed by 5v. 
> How does it know to change the first 0v to 5v as it has not yet received a 5v signal. 
> 
> Is there some kind of comparitor that 'predicts' the incoming positive voltage before it arrives.
> or does it just default to 5v?
> 
> Cheers
> 
> Dan
> 
>

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.