Help for understanding a Chinese U87 fake microphone schematics

[Khron]

This is a really quick build, but it works.

Have you checked / measured what the current consumption of this oscillator is?

 

[Cqwet Dbdfte]

Have you checked / measured what the current consumption of this oscillator is?

The plug board test adds a lot of parasitic inductance and mutual coupling, a tight PCB layout would have to consider this.
My sims were running at a few MHz