[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?

-- 
Gordonjcp




More information about the Synth-diy mailing list