Sound Skulptor forums
Build help and troubleshooting => MP573 Microphone preamplifier => Topic started by: Petrosa on April 13, 2023, 10:29:44 PM
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Hello,
for the pleasure of having your modules as a live vocal chain, ich bought a Radial Power Strip (500mA) for three units.
I put the MP573, a EQ573 and a Elysia MPressor in it. All Units have less than 100 mA power consumption, but when i start it up, the powersupply tuns off after a second, turns on again for a second and turns off again, and so on.
I guess that there is too much power consumption when the units start up. When i remove the preamp or the eq, the powersupply stays on.
Is it possible that the slow start of the mp573 is damaged? Is there a way to fix it? Are there other possibilities to run this combination of modules in the Power Strip? There are no other options for three units in a one HE rack, maybe you should do one, i would buy it :D
Thanks in advance
Simon
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The slow start is a current limiter made of U1 (LM317T) and R27 (7R5).
The inrush current is limited to 170mA.
Replacing R27 by a 10R would limit the current to 125mA.
Replacing R27 by a 12R would limit the current to 100mA.
I would not go higher because it would affect the sound when approaching saturation.