[sdiy] SSM2044 Frequency Range

[Tim Ressel]

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
>
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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com