[sdiy] Moog 907 inductors

Oren Leavitt obl64 at ix.netcom.com
Fri Dec 30 13:03:09 CET 2011



On 12/30/2011 4:19 AM, Ingo Debus wrote:
>
> Am 29.12.2011 um 22:16 schrieb Oren Leavitt:
>
>> IIRC, a while back, someone was asking about, or looking for an example of, the type of inductors used in the Moog fixed filter banks.
>>
>> Well.....here's an example:
>>
>> http://www.ebay.com/itm/130621318887
>
> Thanks for the heads up!
>
> On Flickr there are some pictures of 907 and 914 modules too:
> <http://www.flickr.com/photos/matrixsynth/317870776/>
> <http://www.flickr.com/photos/matrixsynth/317870739/>
> <http://www.flickr.com/photos/matrixsynth/317870707/>
> <http://www.flickr.com/photos/matrixsynth/317870671/>
> <http://www.flickr.com/photos/matrixsynth/317870638/>
> <http://www.flickr.com/photos/9828434@N03/5047562024/>
>
> I wonder, if these inductors are stacked this way, is there some magnetic coupling between them? In the 914 there are obviously even more than two inductors (i. e. from different filters) on one stack.
>
> FWIW I have recorded the impulse responses and the responses to white noise of my 907 clone. Anyone interested? I could put them up on Soundcloud.
>
> Ingo

I think they're stacked that way just to save PCB space. There's two 
inductors and two capacitors per band. On a 914 with 12 bands plus 
low/high pass, that would be 28 coils!

- Oren


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