I have a question regarding the power supply options for the LDR3X.
First of all, please forgive my ignorance as I am not a regular DIYer, but I do own a decent soldering iron and a modest multimeter.
As an owner of a Melos SHA Gold since 1995, I've been a big fan of this type of volume control. My SHA finally started having the familiar Photentiometer problems 2 years ago. The original Photentiometer is somewhat fragile, and not many people want to work on them these days.
I decided that I would like to bring my Melos back to life, with the LDR3X board. I took out the old Photentiometer board & figured all my connections, except for the power supply options.
I have access inside the chassis to 120 VAC, and 24 VDC.
So my question is should I,
1) Tap the internal 24VDC and use a DC to DC converter to get 5 or 12VDC? I have no idea how much amperage is available from the 24 VDC supply that originally feed the Photentiometer board.
2) Tap the internal 120VAC and install a 5 or 12 VDC power supply inside the chassis. I'm guessing that one really wouldn't want a switching power supply inside a line level preamp?
3) Use a separate external 12VDC power supply and connect it to the back of the chassis with a jack?
I apologize to all the advanced builders, if my question seems dumb!