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Vocalist Live3 digital voice processor/harmonizer

Last time I saw this was non-momentary/non-latching footswitch problem, sorting out the firmware failing by slowing down the switch action. That fudge has worked fine. Now guitar input ok but a noise over the microphone input that is white noise wavering in strength so it sounds just like buffetting gusty wind noise. No change to the hash on jiggling anything external. I've recorded the noise and are uncertain whether the wavering is random or complex cycling in nature. I wonder if there will be a cure this time, barely 2 years old.

Reply to
N_Cook
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Just before opening it up, I noticed the phantom button, in on position. Repowering again 48V on and switching off, after 5 sec or so the intrusion noise went. Testing for 48V , something tries to establish on the mic line but drops to 0V over about 5 seconds. So the 48V subcircuit needs exploring

Reply to
N_Cook

Just before opening it up, I noticed the phantom button, in on position. Repowering again 48V on and switching off, after 5 sec or so the intrusion noise went. Testing for 48V , something tries to establish on the mic line but drops to 0V over about 5 seconds. So the 48V subcircuit needs exploring

It is worth bearing in mind that not all units supplying phantom power do so at 48v.

IIRC the Dynacord Powermate 1000 Mk1, for instance, uses something like 24v.

Cheers,

Gareth

Reply to
Gareth Magennis

Thought I'd start from the 48V switch trying to locate the generator. But multiplexed into the uP like all the other switches. Only 63V caps are at the mic input and L&R outputs. Other end of the board is a DC/DC type inductive core lump next to 6 pin SMD IF8CG but no info found on that topcode. The owner was concerned as to whether he'd done something stupid, despite it failing mid-song. Does owner psychology mean he did something stupid, soon before the failure?

Reply to
N_Cook

made 2012. That supply seems to be for 3.3V. Looked for 2x 6.8K resistors at the XLR in and 2 are present, common of those goes via control Q17 and Q18 and some small droppers to a 5 pin SMD U23 and an even smaller inductor. U23 Marked

052 671 483 no info found of course playing with those numbers. p1 and p5 inductor/supply from 5V regulator, 2 gnd, 3 to diode, 4 output. Tomorrow to probe the IC and Qs
Reply to
N_Cook

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