[sdiy] Prophet 08 sub oscillator mod?

[Tom Wiltshire]

Here's some internal photos of the Prophet if you want to know what  
you're up against.

http://prophet08.com/prophet08/

T.


On 2 Jan 2009, at 23:46, cheater cheater wrote:

> yes that's a big caveat that you can't controll it from the uC.
> but microcontrollers can be reprogrammed right? :))
>
> On Fri, Jan 2, 2009 at 9:39 PM, Scott Nordlund <gsn10 at hotmail.com>  
> wrote:
>>
>> It's probably doable if you don't mind surface mount soldering and  
>> finding some place to mount an extra little board.  Assuming the  
>> Prophet 08 works more or less like any other analog-ish synth (in  
>> that the individual oscillator signals are accessible somewhere),  
>> it's just a matter of adding a flip flop for each oscillator.  You  
>> could easily cascade these for more sub-octaves, and use enable or  
>> reset pins to switch it on and off.  You've also got to work out  
>> the signal levels, buffering, mixing, etc.  Since no one (to my  
>> knowledge) has done any Prophet 08 modifications or posted  
>> schematics, you'll just have to go at it with an oscilloscope and  
>> figure it out yourself (shouldn't be too difficult).  It will take  
>> a fair amount of hardware though (8 dual flip flops and 4 quad op  
>> amps?) since you're dealing with 16 oscillators.
>>
>> There's a disadvantage, though, in that the sub oscillator won't  
>> be programmable at all from the Prophet 08 interface, it will be  
>> on/off only and independent of the main oscillator level (unless  
>> you want to add a bunch of VCAs), and it won't be tied at all to  
>> any other features (modulation, etc.)
>>
>> ----------------------------------------
>>> Date: Fri, 2 Jan 2009 18:53:02 +0000
>>> From: cheater00 at gmail.com
>>> To: synth-diy at dropmix.xs4all.nl
>>> Subject: [sdiy] Prophet 08 sub oscillator mod?
>>>
>>> Hi guys
>>> Since the Mopho has the two sub-oscillators, and the Prophet 08
>>> doesn't, I bet more people than me have wished it did! So, has  
>>> anyone
>>> considered such a mod? Even if it wouldn't be stored in the patch  
>>> etc.
>>>
>>> Is anyone familiar with the new prophet's guts, and if so - would  
>>> that
>>> be a difficult task to add a Mopho style sub?
>>>
>>> I don't even know if the insides are canned or if they're moddable.
>>> Has anyone got pics of the insides? I tried googling, but came up  
>>> with
>>> nothing :)
>>>
>>> Cheers
>>> D.
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>>
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