[sdiy] my VCO OSCILLATING!

[Michael Ruberto]

Sometimes if you stare and make threatening faces long enough analog 
circuits start to work. But not this time. Like Tim pointed out there was an 
error in the original schemo that I didn't catch. However, following that 
correction came a freaky streak of failed parts. On my work bench I have a 
small graveyard of transistors. They were all brand new parts too.

Anyway, The VCO is now making a nice glitch-free saw but the frequency range 
is very low. The pitch knob is only giving me around 1 - 50 Hz. I toyed with 
the trimmers for awhile but could only manage to reduce the range even more. 
I'm too tired to figure out this issue tonight. I suspect the 2SC1583. Some 
resistor values will probably have to change. That will be tomorrows chore 
after I work on the car.

M. A. Ruberto