[sdiy] SSM2044 Frequency Range

[Dan Snazelle]

By the way 

Is this on pcb or breadboard ?
I've seen dirty flux boards kill a filters range and ive seen breadboards do crazy things too 

Ive always had great luck with 2044



Sent from my iPhone

> On Sep 3, 2015, at 3:35 AM, "Tim Ressel" <timr at circuitabbey.com> wrote:
> 
> Hi,
> 
> I am getting about 85mV when running at 15 volt rails.
> 
> I have tried chips I bought recently and chips bought quite a few years ago. My original 2044 filter used a chip from a long time ago and it has the same range issue.
> 
> --tr
> 
> 
>> On 9/2/2015 5:38 PM, rsdio at audiobanshee.com wrote:
>>> On Sep 2, 2015, at 5:21 PM, Tim Ressel <timr at circuitabbey.com> wrote:
>>> I just built an SSM2044 based directly on the datasheet schematic. I'm using 12 volt rails. The frequency range is less than expected. The most I get is about 130:1, and when I adjust it for 1 volt/octave the range is about 100:1. Even when I run it on 15 volt rails I get about 370:1. This is far short of the 1000:1 the datasheet talks about.
>>> 
>>> Any ideas?
>> Do you see +/-90 mV at pin 13 when you vary the CV?
>> 
>> How are you confirming the filter frequency cutoff?
>> 
>> Do you have the entire circuit on page 54, including the Frequency Offset Adjust and the Control Summer?
>> 
>> Brian
>> 
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> -- 
> --Tim Ressel
> Circuit Abbey
> timr at circuitabbey.com
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy