DIY Mic Pre Kits, Lunchbox Mic Preamp Kits, Power Supply Kits

Hi,

I just got my hands on a pair of PM-1000 channels and I'm in the process of racking them up. I thought it would be a good idea to have a proper thought trough power supply for my first project which would be PSU-4448.
Now, if I get a proper power supply I might try to get more channels and rack them up as well. My question is, how many channels can I power with one PSU-4448? I'm a novice when it comes to electronics. I know the figures are there somewhere but I'd like to know the correct answer before I go I do something foolish.
Thanks very much for all feedback!

I measured the current draw of one of my PM1000 channel strip. I measured anywhere from 27ma to 29.2mA. So we can round it up to 30mA current draw per channel with no signal present.

How many strips a PSU can power depends on how much current the chosen power transformer can give... and also the max. rating of the regulator chip.

The TO-220 voltage regulator I'm using is rated at 1.5 Amp (or 1500mA), and the transformer is 1.388 Amps. So there's enough power for two or more channel strips by the PSU.

If you're racking PM1000 strips, you can fit 2 channels in a 2u case, mounted horizontally. So this PSU will be perfect for the job.

How about 8 or 16 channels? From the math, it looks possible (though I haven't done it.) But for sure, the heatsinks I supplied will need to be upgraded to bigger, heavier heatsinks.

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Thank you very much for your answer! I thought I'd make a power output socket on the back of my first PM-1000 2U box so that I could hook up any possible further PM-1000's to the same power supply. Got the idea from a friends Neve preamp which has an external power supply which can power two units. I'll make sure the heatsinks are heavy enough.

If you'll be connecting the (2) TO-220 regulators to the same heatsink, you'd need to insulate them using the bolt insulator and mica pad insulator for TO-220 packages.

Otherwise, you'd be shorting the two devices together. The metal tab of the TO-220 is also one of the legs of the device.

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Ok, thank you very much for the information!