Doepfer

Hi Ingo,

> i thought about that module too, but it isn't available
> anymore.

The main chip in it is very hard to come by. I was curious as to what 
the module was, so when he came across a limited number of chips at 
the end of last year, I snapped one up. Buying just the board was a 
cheap way to do it, but expensive in terms of time: ordering the 
parts, working out replacement parts to use for those not easily 
available in the UK, and working out how to put it all together.

the blacet-stuff seems to be cool, i have ordered
> some modules last week, but i have to wait some weeks for
> them. blacet seems to be very busy at the moment.

I see he has 'Time Machines' available again - I'm tempted to go for 
one of those, but they are pricey.

> many thanks, tim. i think i will do it the same way you did.
> there are some more modules i want to modify with additional
> switches, like a112, a176 and maybe a108.
> the a108 seems to be a bit more complicated.
> any experience?

I don't have either the 112 or 176, but I have an A-108 which I have 
reverse engineered, and yes it is plenty complicated! Depending on 
what you want to do, I may be able to make some suggestions: if you 
want to be able to switch between the filter slopes, then something 
similar to the A-127 may work, but would require a different conector 
(because of the way the jumpers are arranged); if you want to make 
all the filter slopes available, this will require additional 
circuitry. Which leads me to an idea:

Dieter, if you see this, perhaps this would make a good candidate for 
the new 'DIY page'? - circuitry and PCB layout to extend the A-108 to 
output the remaining 4 filter sections. Should be pretty simple: 3x 
TL084, several handfuls of resistors, a power connector and some 
sockets, and means to hook into the A-108. I'm sure there are several 
people out there who would like to do this!

My happy thought for the day!

Tim