Yahoo Groups archive

Doepfer

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

Message

AW: [Doepfer_a100] help for starter needed

2015-11-23 by yahoo@doepfer.de

> But the A-190-1 has a transistor-buffer in the gate-out line. So there
> is no danger at all.

I'm sorry but I have to contradict. The (old) A-190-1 had a transistor at the gate output together with a pull-up resistor connected
to +12V. The transistor was used as a switch to GND (similar to the Moog S-Trigger). As long as the transistor switch is open the
gate is "high" because of the pull-up resistor. As soon as the transistor switch closes the gate turns "low". If in this state a
voltage is applied to the gate bus the transistor maybe be fried (provided that the voltage applied is "powerful" enough to fry the
transistor). In later versions of the A-190-1 we added a serial resistor to avoid this problem (as well as in all other A-190-x
interfaces).

General information about the CV/Gate/bus subject is available on our website:

www.doepfer.com > Products > A-100 > Technical Details > Power Supply and System Bus

Best wishes
Dieter Doepfer

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.