[sdiy] Moog Voyager - No Osc Sound

Barry Klein barryklein at cox.net
Tue Feb 5 20:49:39 CET 2019



Welcome to Analog.

> On Feb 5, 2019, at 11:32 AM, Mike Beauchamp <list at mikebeauchamp.com> wrote:
> 
>> On 2/5/19 1:10 AM, Roman wrote:
>> That's because analog and digital boards were designed by 2 people with completely different background and habits. One of them was Bob Moog. Now guess which was the one he did :)
> 
> I knew he designed the circuits (Love the scene in the "Moog" film where he's holding one of these boards and describing the connection he had with it), but I didn't think he would have been responsible for the PCB layout. Even if he was, I'm still wondering why he would have chosen exclusively Through-Hole on the layout? Wouldn't that just be an additional cost burden?
> 
> Speaking about cost burdens... after removing the board I noticed there are over a dozen cludges to the circuit board on the top and bottom. Extra caps tacked on, resistors lifted, lots of extra wires.
> 
> 
>> About failing chips, there might be several causes. Could be damaged by ESD at some point during storage or delivery or during assembly, or one (or more) process during manufacture was badly adjusted, or it was overstressed in the circuit and later they used different part, or they used vintage chips found at the back of a barn that were not really good even when new, or electromigration causing all chips to die eventually. Or all of this combined.
> 
> Thanks Roman, now I'm paranoid that everything I own will stop working in the next few weeks :)
> 
>> What was the chip they refer to as the one failing regularly?
> 
> They didn't tell me, just said there were issues with that serial # range. Other forums have said TI chips, op-amps specifically. Wish they would have just told me.. I have drawers full of TL07x.
> 
> Mike
> 
> 
> 
> 
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