[Coco] WTB Orchestra 90 cartridge

[Zippster]

It’s certainly standard operating procedure.  Not a big deal to change it.

- Ed

> On Aug 1, 2016, at 12:59 PM, Simon Jonassen <simon at roust-it.dk> wrote:
> 
> I would tend to agree that any audio OUTPUT that needs to be AC coupled (eg dc filtered out) should use an electrolytic cap 
> 
> just my 2c
> 
> /Simon :-)
> 
> 
> -----Oprindelig meddelelse-----
> Fra: Coco [mailto:coco-bounces at maltedmedia.com] På vegne af Zippster
> Sendt: 1. august 2016 15:02
> Til: CoCoList for Color Computer Enthusiasts
> Emne: Re: [Coco] WTB Orchestra 90 cartridge
> 
> Things can get a little weird when you get into audio land with opinions on capacitors, but…
> 
> I think ceramic will be fine here considering the value (.1uF), and use (ac coupling).
> If we were using a much larger value, I’d probably agree and go electrolytic or film.
> 
> In any case, I’ll put a scope on it and take a look at the signals.  
> As well as the highly subjective test of human ears.   :)
> 
> - Ed
> 
> 
>> On Aug 1, 2016, at 2:44 AM, Jayeson Lee-Steere <cocolistemail at titaniumstudios.com> wrote:
>> 
>> On audio, there are a lot of options about which caps are appropriate for
>> audio, but all references I have seen say that ceramics are not an
>> appropriate choice in the audio path. Given their strong piezoelectric
>> properties, it is not clear to me what are appropriate uses for the
>> recently available, high value MLCC ceramic caps. Too bad, because they are
>> smaller and less costly than tantalum.
>> 
>> This reference on audio caps seems fairly balanced:
>> http://sound.westhost.com/articles/capacitors.htm
>> 
>> Film capacitors are the thing to use where practical. It would seem some
>> film types are better than others, but for this use, polyester would be
>> more than sufficient. That is probably what the small value caps are in the
>> original Orch 90. Next down the line are electrolytics, which are
>> apparently fine for audio coupling if an appropriately large value is used.
>> 
>> Jayeson
>> 
> 
> 
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