Whoops

Re: Whistle Rock Audio ML12 preamp BUILD/HELP thread!
« Reply #160 on: August 19, 2020, 09:03:49 PM »
I have basically put the black to where it says AC on board, put the yellow to where it says AC on board, then i combined the red and orange and put them both to CT & CT.

Should be good, both CT points should connect to each other.
Check it out measure continuity between those 2 points.
Also reference with the schematic


Whoops

Re: Whistle Rock Audio ML12 preamp BUILD/HELP thread!
« Reply #161 on: August 19, 2020, 09:04:56 PM »
This will also work



TillM

Re: Whistle Rock Audio ML12 preamp BUILD/HELP thread!
« Reply #162 on: August 20, 2020, 02:51:49 AM »
Too much power?

It's 700mA per each primary. So it's good to power 4x 312 Mic preamps plus phantom power and still have some good safety margin.

No I mean I would take a transformer with 15vac at the secondaries.
But that’s just my choice.
« Last Edit: August 20, 2020, 03:11:17 AM by TillM »

Whoops

Re: Whistle Rock Audio ML12 preamp BUILD/HELP thread!
« Reply #163 on: August 20, 2020, 03:06:27 AM »
No I mean I would you a transformer with 15vac at the primaries.
But that’s just my choice.

Oh yeah, the 18VAC will rectify to 25,4VAC
A little more heat and wasted energy

Whoops

Re: Whistle Rock Audio ML12 preamp BUILD/HELP thread!
« Reply #164 on: August 20, 2020, 03:11:56 AM »
When you center tap them, you get 36vac.
So you have to put them in parallel.
So that you just connect the AC on your PCB.

Sorry TillM this is not correct, the CT is the 0V reference and connected to ground. So it's 18VAV on each side of the secondaries with opposite polarities

TillM

Re: Whistle Rock Audio ML12 preamp BUILD/HELP thread!
« Reply #165 on: August 20, 2020, 08:19:53 AM »
Sorry TillM this is not correct, the CT is the 0V reference and connected to ground. So it's 18VAV on each side of the secondaries with opposite polarities

Thank you for your explanation.

Re: Whistle Rock Audio ML12 preamp BUILD/HELP thread!
« Reply #166 on: August 20, 2020, 06:50:00 PM »
Sorry TillM this is not correct, the CT is the 0V reference and connected to ground. So it's 18VAV on each side of the secondaries with opposite polarities

Thank you so much for your in-depth explanation and diagram, This has been so helpful and very much appreciated!! Both you and Tiim.