[Coco] It's a small win, but a win nonetheless

[Dave Philipsen]

Well if you can make it work without the cap then fine.  I guess I don't 
know exactly what you're trying to build but if you are always going to 
hook it up to a known entity that always has the same characteristics 
you'll probably be ok.

So you're saying that the waveform you're getting from the CoCo swings 
between .6 and 1.3v referenced from ground?  I guess I'd just want to be 
sure that that spec will always remain the same without variations 
between different computers.

Dave


On 3/11/2017 12:44 AM, RETRO Innovations wrote:
> On 3/10/2017 9:05 PM, Dave Philipsen wrote:
>> So are you running with just the comparator, no opamp before it?  Is 
>> your comparator input de-coupled from the cassette out signal going 
>> into it?
> A 1M pulldown on the input fixed the issue, so it seems the voltage 
> divider needs a small tweak.  But, I did add a decoupling cap, and the 
> signal went from .6-1.3V to 0-.5V, so I need to redo the divider all 
> over.
>
> Is there a good reason to use the decoupler?  I get lots more noise in 
> the signal to the comparator when I do so.
>
>