Doepfer

Florian,

the CD4051 and CD4053 in the A-155 are supplied with -5V (auxiliary voltage
VEE) and +12V (VDD). Consequently voltages in the range -5V...+12V can be
switched by these circuits.

Increasing the CV voltages can be realized easily by increasing the feedback
resistors in the OpAmp circuits (please refer to my other message).

Dieter

> -----Ursprungliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von Florian Anwander
> Gesendet: Dienstag, 26. Juni 2007 01:18
> An: Doepfer_a100@yahoogroups.com
> Betreff: Re: [Doepfer_a100] Using A-155 with ARP 2600
>
>
> Hi Henrik,
>
> I checked the schematics, and it looks like the range of the trigger
> voltage cannot be extended on the A-155, because there a CD4053 is used
> as switch, which can switch only 8 V as far as I know. But you might add
> a simple "pushup"-addon pcb. It requires one opamp (or two transistors)
> and three resistors per channel. Not too difficult of you are able to
solder.
> Similar for the Voltage: also here a CD4053 is used in the S&H stage. So
> the output voltage is limited. And again, a simple DC amplifier could do
> the jobe here (does not need to be precise, because you trim the real
> voltage with the pots anyway).
>
> Florian
>
>
>
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