So volts are not only volts but also provide us with freq
Yes, it does. DC - no, but AC - yes.
I am assuming current does not have a frequency attached to it?
And,
no. AC current has the same frequency as the voltage (however their
phases might be different - that concept is for later - not necessary to contemplate now).
But that would mean by altering freq, we get radio etc,
Yes, radio is dependent on AC (and its frequency) for transmission and reception.
that would mean there's thousands of minute electrical pulses all around us in everything we use, have I understood that right?
Essentially, that is correct. But I might as well broach the subject of
waves of energy. Heat, light, radio communications and radar are forms of "wave" energy. This is energy that has no mass (unlike an electron, which does). But for for the moment, your understanding is fine.
NOTE: While I'm at it, I want to point out that the PCB circuit, for all intents and purposes, is
not oscillating. There may be some ripple you're seeing with the scope (although I
cannot reproduce it) and that is stumping me, but not what you'd expect for a properly working oscillator in a circuit like this (switching power supply).
And I don't know, for sure, what the circuit
should look like, frankly. Something is not right. I've asked a EE type professor (Dr. Mark McKinney) at the Citadel:
www.Citadel.edu
to check out the circuit and tell me what's going on. I know it appears to be working properly, but the fact I can't see a meaningful oscillation, and the fact that the whole circuit draws almost 2A with practically no load, gives me pause. [EDIT] Although it
is a bucking circuit, so maybe that's not so weird.
But, I just don't know, and I'm having a lot of difficulty finding a similar circuit on the web.
And KISS, I'll take any and all suggestions you have, please.
I'll let you know what I hear back.
But your understanding of this new hobby is progressing
very nicely.
