[sdiy] Debugging Hammond filter circuit

[Aaron Lanterman]

On Apr 24, 2010, at 10:29 AM, Donald Tillman wrote:

> Yes, that's R152, providing DC bias and negative feedback from the collector to the base.  It's hard to tell because the dot connecting R152 to the collector was omitted.   (That was one of the mistakes I was referring to above.)

Luckily we didn't run into that - I had her build just up to the output of OA2. 

> There are lots more mistakes... For instance, there needs to be a high value input resistor on the CONTROL SIGNAL INPUT.

That one I caught, once we realized the cutoff wasn't changing at all. ;)

- Aaron