/diy/ - Do It Yourself

>>1897290
If that really is a 4009 inverter, then pin 15 is also an output (the one controlled by input 14, which is connected alongside the others), and it's going back to the op-amp F1 for feedback. But it's also modulating pin 1 and 16, which are both Vdd (input power supply) and Vcc (output power supply), which is real fucking wacky. I can only assume that this somehow uses the 4009's output stage in the linear region.
Pic related.

>>1897300
>Resistor network
I don't think so. What would make sense is if it were an array of JFETs or other components that could act as variable resistors. F1 modulates the 4009's inputs (either from an internal oscillator as controlled by the 1M pot, or the 100k pedal/pot), which is exactly what you'd do with a conventional phaser pedal. But the 4009's presence is an anomaly.

>>1897339
I've heard people complain about latency with digital microscopes. I've soldered SMDs without a microscope or even a magnifier, so unless you've got bad eyes I'd give it a miss.