Power supply for Phonic MM502 mixer

[Risto]

Hello everybody,

I have this little mixer but no power supply. Could anybody describe the proper connections for the 3-pin power socket? Sadly, the manual tells nothing about this. I could make the power supply myself.

I'm grateful about Your attention,
Risto

[Jazz P Bass]

Try +15Vdc, -15Vdc & Ground.
Open her up & look where the pins go.
Opamps have power at pin 8 (+) pin 4 (-).

[Dr Jerry]

MM502 mixer 3-pin power supply voltages

Although this is way too late relative to Risto's needs, the following info may help someone in the future. I just purchased an MM502 today and am measuring the PS outputs now. The PS has the following markings: P/N: 353-60101-000-0, Model: MW48-1680500A, Input: 120V AC 60Hz 20.1W, Output: 2*16.8V AC 500mA. The pins are numbered (in quite small raised-letter fashion) next to the holes on the female plug. Between pins 1 and 2, open loop (i.e. without a load; without being hooked up to the mixer) I measure 18V AC; between pins 2 and 3, I also measure 18V AC; between pins 1 and 3, I measure 36V AC. So, I would conclude that inside the 2" x 2" x 3" unit (located mid-way along the electrical line from the AC plug to the mixer 3-pin plug) there is a center-tapped transformer with a secondary winding of 16.8V AC either side. The fact that I read 18V instead of 16.8V is not important and relates to the fact that there is no load on the transformer. I hope that these measured data will be of use to someone needing this information in the future. Because, as Risto said, the mixer manual provides no details about this power supply.

[Wolfcry]

I have a Phonic MM1705 in my shop with a dead power supply just like this one. If you crack open the power supply, you'll find there's no fuse, just a transformer. My transformer is dead. I've found a suitable replacement at Mouser, part number 546-164H36. It's a Hammond 164H36. If you have the ability to wire up the new transformer, this should get you running again.