I have finished the rough draft, of the Dual Supply model. Here is the pfd.
I added some options, for the Vref, the V Supply and the number of MOSFETs, based on the parts I have in my stocks and what I intend to build. Take your pick and delete the remainder. Or, add your own twist.
I will post the KiCad files, as soon as I clean up a few details. To do that, I could use some help, with these (bumped) questions:
Please clarify the suffix, of the values, of these resistors. I could guess, but that is dangerous. Such as R19 is a 51R resistor… These component reference numbers are for the Single Supply model, that I posted above, but they need to be updated in the Dual Model, too.
R1 100
R2 0.1
R20 100
R21 0.1
R23 3300
R4 3300
R5 0.1
R9 2.2
Would it be okay, to bread board the circuit? Or, will there be issues... Voltage, amperage, capacitance? I would think that I would not want to run it above 1v/1a. If I can Bbd it, I will order the exact parts, from Mouser.
At the risk of adding project creep, I have two questions:
1) If I wanted to add a switch, to bring in, or cut out, the oscillation section, without spinning the knob, where would it go?
2) If using an independent function generator would add functionality greater than the on-board oscillator, where, in the circuit, should it be injected? Just use the type jack that breaks the circuit? What issues might there be?
3) If two dual op amps are used, I would think that any unused units might be used to create a sign wave, too, in the oscillator section.
Non-creep question:
Would there be any great advantage to using ten-turn pots?
I still need lots of help with proofing, on both models. Please, please, oh please and thank you. <grin>