Going Linear with the Caiman

[Ali Tait]

Not sure it'll make as much difference Gary,yours has the Murarta regs on does it not?

[Clive]

I'm talking from general experience as I've not yet Wolfsoned my 7520. I have however done the passive mod.

Here's what I expect....

For passived Caimans the 12V (or 10V) reg powers some ICs but not the opamps any longer. So in some respects the quality of the 12V supply may be less crtical now. I expect the 10000 uF cap should be replaced with a 10uF film or tant. The linear supply for a passive output Caiman can probably be unregulated if well filtered or a simple reg supply using a 7815.

Sorry this isn't the simple non-diy info you wanted....we need to be sure what works best first.

For a Caiman with opamps I expect a higher quality linear super reg supply would be worth doing.

[chrism]

I have also been thinking along the same lines as Ali. I think that a good linear supply with 12v, 5v and 5v supplies may be best with the internal voltage regs removed.

The 12v and Wolfson 5v looks straight forward to wire up but not certain where else to feed a dedecated supply to.

Regards

Chris

[Ali Tait]

Yes sounds like a good idea,I have a spare 5v supply.Perhaps Stan could advise?

[StanleyB]

Yes sounds like a good idea,I have a spare 5v supply.Perhaps Stan could advise?

Feel free to experiment. I myself would always use a regulator as close as possible to the main circuitry. Less chance then of any RF etc. hooking onto the DC leads from PSU to chips. If using a split external PSU, don't forget the RF filters. A parasitic bead in each lead should do it in most cases.

[Ali Tait]

I have a 7510 with passive mod Stan,which I'm feeding with a regulated linear supply.I have another 5v one.Where would be the right place to connect it please?

[StanleyB]

Try connecting it to the output pin of the 5V regulator, after desoldering the 5V reg. But make sure it is 5V, not 4.5 or 5.5. Some chips have a very low tolerance factor.

[Gazjam]

Not sure it'll make as much difference Gary,yours has the Murarta regs on does it not?

Yeah..
mines has the Mutara's fitted Ali..

so we reckon it wont be as much of an improvment switching to a linear supply?
the difference with your 7510 was very obvious...

[Ali Tait]

Aye but mine doesn't have the regs.Still worth trying though,you may still get a improvement,though perhaps not as great as with the 7510.

[Ali Tait]

Try connecting it to the output pin of the 5V regulator, after desoldering the 5V reg. But make sure it is 5V, not 4.5 or 5.5. Some chips have a very low tolerance factor.

Thanks Stan.