Electronics > Beginners

super-low frequency PSU oscillations + AC coupling with electrolytics

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pepelevamp:

--- Quote from: Tomorokoshi on July 19, 2019, 10:01:13 pm ---6. Tim just saved you a few days of pain.
7. If this forum has a fault, it is a tendency to give more information than is requested, or less information than requested, but seldom just the information that is requested.

--- End quote ---
Its not the electronics tips, its the going on about it brand names of amps or not being worth anything etc. Its irrelevant & condescending.
Besides we asked about whether it was safe to construct an AC-coupling with an electrolytic so we could continue investigating, because its complicated trying to relay details over the forum like this.
My gut feeling is no. But it wont be till monday or so until we have an opportunity to get some help with it by someone who knows more about power electronics and has more capable gear. But we are still weary of even high-end scopes AC coupling frequency response which is why we asked.

mike_doom:
I wish I could provide a schematic but i have been unable to get one from the manufacturer or anywhere for that matter. *See a zoom out pic. I'll try get some more information  on the components.

mike_doom:
1*see new pic
2 led next to power switch on front panel
3 an input transformer I believe which is switchable 230v/120v etc
4 ill have to get back to you on that.
5 no just that one there

-The black molex socket provides power to different rails on the main mic pre-amp board.  *labeled voltages Ive currently unplugged the rainbow coloured cable going to the main board.

-Blue and brown are attached to power switch on front panel

-the small transformer *as shown in pic here which is just after the main input transformer is this guy here:
 https://www.altronics.com.au/p/m7064a-powertran-5va-12+12v-pcb-transformer/

mike_doom:
see labeled rails

mike_doom:
I Should also make note that those sub harmonics still show even when the 12At7s tubes are removed.

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