[sdiy] Korg SDD-3000 5 volt supply problems

Gordonjcp gordonjcp at gjcp.net
Fri Nov 16 08:46:58 CET 2018

On Thu, Nov 15, 2018 at 07:12:10PM +1000, Adam Inglis wrote:
> With 7.8 ohm resistance, the 5 volt rail was pretty steady. With 6.7 ohms, the bench voltage shut down. So about 700mA seems to be the breaking point.

That's not right.  7805, TO220 package?  That shouldn't even be close to
shutting down at 700mA, unless you mean that the bench PSU is giving up
before the 7805?

> That would seem to leave a 1000uF electrolytic, a 0.1 uF disc cap, and a diode that could be suspect. I’ll get back to it tomorrow.

Are you sure it's not oscillating?


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