Another Quasimodo lives!
I built it up last night, but only getting to use it tonight. After figuring out how t trigger the scope properly etc, I think I have stable waveforms. I connected up a random 12v transformer and was able to adjust the pot to get pretty close to the pictures in the manual that
@Mark Johnson kindly provided - not quite as clean, but not bad. I also tried a much heftier 40V transformer and that was cleaner looking. Finally I pulled out my Aleph J, big 20V transformer and hooked it up. The results are below.
A: This first one is essentially undamped - I think the pot was up around 500R or so.
B: If I'm right, this one is I think the goldilocks spot - just damped, maybe a tad underdamped:
C: And this one I think is over damped.
I hope I have that right - If I do then I'm well on my way.
On all 3 of the transformers I measured with standard capacitors as per the manual, the resistor reading is quite low - from 15R to 30R. Is this normal? Should I change the capacitor values to achieve a higher resistance?
Fran