Polysynth makes 3 Phase Source

In this video, I have applied my Arbitrary Waveform Generator (the subject of a prior video), experimentally, to create a basic 3 Phase (sine wave) Generator, effectively making a simple 400Hz Polysynth source. The wave shapes are good sine waves, however, the 120° phase displacement isn't as accurate as I would like, and will be the subject of an update. As these waves are AWG derived, each wave source could be (within a range) of a completely different shape. Naturally, the fundamental frequency can also be changed. This 3 phase source could be of interest to anybody experimenting with used airborne/military equipment and Synchros, Servos and resolvers etc., (rotary transformers) via 3 Power Amps. However, I don't know the amount of phase error that's acceptable (if any) - please comment if you know.

0:0 Introduction
01:08 Essential old equipment
01:54 Breadboard flyover
04:28 400Hz Confirmation/Phase measurement
08:15 Circuit Diagram explanation
17:37 Power Supply circuit explanation
19:02 Phase Angle Calculations
20:55 Conclusion

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Links:
My "Making Waves" AWG video:    • Build your own basic Arbitrary Wavefo...  
LM324: https://www.onsemi.com/pdf/datasheet/...
CD4001: https://www.futurlec.com/4000Series/C...
CD4015: https://www.ti.com/lit/ds/symlink/cd4...
NE555 datasheet: https://www.diodes.com/assets/Datashe...
78L05 datasheet: https://www.ti.com/lit/ds/symlink/lm7...