[sdiy] 555 timer adsr

[Roy J. Tellason]

On Sunday 23 July 2006 05:05 pm, James Dunn wrote:
> Hi,
>
> I'm currently working on a 555 timer based ADSR, but the output doesn't
> seem to ever completely reach 0v. I saw this schematic online:
> http://www.uni-bonn.de/~uzs159/vcadsr.png
>
> can someone tell me how I would connect the diode as specified at the
> output op-amp? I assume a 1n4148 would suffice? The circuit I'm using
> is slightly different (TL071 on the output) but I'm hoping this might
> work!
> thanks

Dunno about the diode,  though it would seem to me that anode to output would 
make sense...

What I'd do is a bit of injection into that output op amp to make it reach 
zero.  This may affect the maximum amplitude you'd reach.

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