AW: Maxx VCF-5A MS5O clone

[tomg]

On 28-Jul-98, Haible Juergen wrote:
>>The VCF-5A is based on the MS5O. This is worlds most dangerous VCF
>only ear
>>plugs can save you with the resonance up over half way, it's like
>sticking a
>>ice pick in your brain. This one is best build in the daytime so
>you don't
>>wake up the block twisting the res pot. Used a 3O45/46 in place of
>the diode
>>block, works very well.
>>
>>
>> http://www.tomg.vivid.net/maxx/page_032.html
>>

>Hi Tom,

>How have you matched the discrete diodes to the transistor array ?

>Where's the original temp compensation circuit ?

>JH.


I made a few modifications to be basic circuit as I went. The most obvious
being the replacement of the diode block with a LM3O45/46 transistor array. My
fist thought was to use two arrays but I tested matched and unmatched diodes
and array transistors connecting the balanced ladder but anything out of the
box seemed to work just as well, with a little tweak to the balance trimmer,
so I settled on 1N914s. I also omitted the temp comp diodes. I tried it both
ways with a hair drier (not full on of course) and drift seemed about the
same. If they had performed some sort of compression or affected the sound I
would have left them in.

-Tom