[sdiy] TR-909 undersized DC blocking caps

[Richie Burnett]

> Again, I disagree...
> 
> Are you saying that if you do a sim of a summing op amp with Rf of 20k 
> (I cant read the value on the schematic), a common 1uF coupling cap, a 
> 13k input resistor going to your signal source and 9 other 13k resistors 
> going to ground that you get a HPF cutoff of 120Hz?

Yes!  PSpice simulation shows this, as does the actual TR-909 I tested,

-Richie,