[sdiy] 2044 range issue (old)

[Tim Ressel]

Hi,

Remember a while ago I was having trouble getting the full range out of 
a 2044 design? Well, I was playing with the new 2144 from Sound Semi 
when I realized what I was doing wrong. The 2044 ( and 2144) frequency 
pin goes positive and negative. The datasheet example is rigged for a 
bipolar input for frequency control. I was doing unipolar. Since the 
freq pin in exponential, a small reduction in voltage range results in a 
large reduction in frequency range. My new design works well. I just 
need to bias it for unipolar control.

The SSI2144 sounds great btw

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