[sdiy] Andromeda A6 repair?

Michael E Caloroso mec.forumreader at gmail.com
Thu Jan 15 01:02:41 CET 2015


Not just mix of values but also mix of dielectrics.  Ceramic (small
values) with tantalum (large values) are two recommended mixes.

MC

On 1/14/15, Barry Klein <Barry.L.Klein at wdc.com> wrote:
>
>>Recently I heard that in today's fast digital circuits 0.01 uF are better
>> suited for supply decoupling than 0.1 uF caps. The resonant frequency of
>> smaller caps is higher.
>
> Yeah I read some papers from companies like HP that even suggested 3 values
> in parallel.
> The thing about this synth design is that there really is not much bulk
> capacitance.
> The supplies are linear regulators like the LM317.
> Here in our products I think we use a lot of .1uF's.  Also larger like 1uF,
> 2.2uf, and 10uF for chips with higher current VDD requirements.
> A board as big as this A6 main board seems kinda light with just local
> .01uf's and the caps in the regulator circuit 8 inches away.
> The way this synth has such an irregular boot behavior it is something
> analog causing it.  I'm thinking the caps could help.
> There seems to be a good reset hold off on initial power (dedicated reset
> chip).
> Could be irregular xtal behavior too I suppose.
>
> Barry
>
>
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