[XCSSA] Want to build a SID synth but don't have time for the MB-6852?

[X-otic Computer Systems of San Antonio]

On Sunday 04 October 2009 10:06:21 pm X-otic Computer Systems of San Antonio 
wrote:
> Thanks to help from Tweeks, I was able to resolve the power issues
> with the MB-6582 and was able to run without issues for over an hour.

Cool.. getting the hear of your 7805 vreg was critical.

> I was able to 
> largely resolve this by using 4 1-Ohm power resistors in series, which
> dropped the voltage from 12V to 8V before the 7805.
>
> I've got the resistors in a heatsink sandwich to help with heat.
> Though the resistors seem to get hotter than the regulators, 

As they should.. They're dissipating 4v x 1A = 4Watts, as opposed to just 
around 2-3Watts of the regulator.


> I plan on moving everything over to a gutted PC PSU 
> case so I can help use that for heat, as well as mount a fan.

With a PC PSU case, you should be able to get enough thermal conduction going 
to passively cool it.


> In any case, the only things left are to figure out the control
> surface issues (still having a few), figure out the LCD (it's got to
> be a short somewhere) and really the rest is just cosmetic and minor
> odds and ends. I don't want to jinx it so I wan't confirm 100% I'll
> have this by next meeting, but things are looking good!

Cool Tim!  Lemme know soon if you think that you'll be able to demo it.. We're 
all looking forward to it!  It's been a long time coming!  Obviously a real 
passion. :)

Tweeks