MAM MB33 Power help please!!!!

[bubba kron]

I just bought a MAM Mb33 off ebay with no powere adapter or manual!!! The power says 15v which radio shack does not have!! I bought a laptop universal adapter from frys , but did not power up!!! Its a 3000mA universal adapter, is that too small?? OR do I have a bad unit??

Thanks , Bryan

[Stab Frenzy]

I believe the MAM stuff needs 15VAC and you bought a 15VDC power supply.

[downgrade]

yep


Went through the same thing with my SQ16. Should be 12v AC


*edit*

Sure it's 15v? Was under the impression all of their stuff was 12v.

[bubba kron]

Any suggestions on how I get one!?? Online?

[downgrade]

I remember someone posting a link here to hard to find AC power supplys. Ya might have to look around.

[downgrade]

here it is:

http://www.leadingqp.com/PA/adaptersNA.aspx

[bubba kron]

Wow thanks so much, this is a great forum- glad I found it!! Any mA amount suggestions??

[bubba kron]

It seems the largest 15v on that site is mA 2500, ist that the one I should look for?

[downgrade]

meh, couldn't tell you. Your best bet would be locating a .pdf manual and finding out the correct amperage.

[downgrade]

Some discussion here regarding the mkI, mkII and freebase adpaters.

http://www.circuitbenders.co.uk/forum/i ... 302.0.html

[downgrade]

Some discussion here regarding the mkI, mkII and freebass adpaters.

http://www.circuitbenders.co.uk/forum/i ... 302.0.html

[soundxplorer]

I just posted in this same forum about needing an adapter for a MAM VF11 vocoder. They DO need an adapter that outputs AC, so make sure you find one of those (not the standard DC output).

My VF11, on the back, says 12v 500mA AC
So here is what I bought:
http://www.radioshack.com/product/index ... Id=2049687

If yours is 15v, you'll need to find a different one. The voltage needs to match.

The current rating (mA) just needs to be equal or higher.
For example, the VF11 needed 500mA. The adapter I bought is 800mA, so it works fine.

[space6oy]

my MB 33 mkII uses a 12v AC 700mA power supply. it's an original from MAM.

[snod_donkey]

Just got one myself to fix, well the Freebass FB383 version which looks to be exactly the same unit. Had a look around the circuit and found the unit will work fine with an ac or a dc power unit. Because of the very basic circuit it allows you to use a dc power supply even though its designed for ac. Just use any standard plug in the wall dc supply at about 15 volts dc, make sure the +ve positive is on the outside and the 0v ground is on the middle pin. Opposite way around that most adapters. It has 2 internal power regulators, one for the 5 volt line, one for the 12 volt line. Use a dc supply of about 15 or 16 volts and it will be fine as the regulators will sort it out.

Not very high powered so i would think 1 amp would be plenty. If in doubt use one a bit higher.

Lots of the used MAM and Freebass units have a midi problem where after switching on you get a sound come out, the midi led comes on as it should while its setting itself up but the midi led never goes out... then it never responds to any midi messages.