rcb Wrote: 
> You're absolutely right my fault - i was typing fast and 
> botched it completely: I had *meant* to write:
> 4.37 -- 4.70 voltage range *not* 1.4x.
> My guess was that because the Allied unit I got
> was low by over 10% from the spec of 5.0V,
> this led to the flickering when it powered
> the SB3.  I hope that a replacement unit 
> will provide a full-fledged 5.0V  (I measured
> the switching PSU that came with the SB3,
> and it was putting out 5.13-5.08 V, consistently.

You really need to get +/- 0.1V. There is something wrong your power
supply if it's off by 10%.

Under/over-voltage shouldn't hurt SB2/3, but it may function
erratically. I can tell you for sure that the display and analog stage
will not function correctly below 4.6V, and below 4.9 is questionable. 
If you're going to use an aftermarket supply try to get it dead-on 5.0.
Linear supplies are usually easy to calibrate - measure at SB3, not the
output. A shorter, heavier cable may help too.


-- 
seanadams
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