[sdiy] 4069 vco gives v+ noise?

[Michael Buchstaller]

...short Idea to see if the Xformer in the PSU is the
problem:
look at the PSU output with a scope, and then simply add
resistors to simulate the load that the modules are.
If the hum comes back, you know that it is the PSU.
If not, it may be one of the modules.


-Michael Buchstaller