i need some help with ancient RFZ modules

[kokoon]

I would really appreciate if you guys could take a minute and try help me with the following.

I have the following RFZ modules, pulled from a console, that I'd like to put in an enclosure, complete with a power supply:

1x W735/1 (a two channel 7-band EQ)
2x V740/1c (a mono preamp)

the questions:

1. I have some info on both units and so far I have gathered that they both run on single -24V supply. I have read everything I could found and it looks that way - but I'd be really happy if some of you could confirm this - does this mean that I can just connect the ground of a normal 24V power supply to the "-24V" input of the module and the 24V line of said supply to module's ground?

2. Assuming that is true, I'll still be needing to build the PSU. Since all I need is a single 24V DC line, it shouldn't be that complicated. Do you guys know any nice and simple DIY PSU project? Maybe even a kit? Or is it really so simple that I'd be better off breadboarding it? Take a 7824 (or even a 7924?) and copy the example application from the datasheet?

3. As for the current consumption, I only have rating for the preamps - it says <= 45mA. Would I be wrong to assume that a 5VA toroid would be sufficient as the voltage transformer?


I'd be delighted and eternally grateful if any of you could give me some pointers to the above.

[Sound]