[sdiy] Sliders and envelopes

[Simon Brouwer]

As a DAC for ADSR's you could consider MCP4725A0T-E/CH which is a very 
cheap 12-bit serial DAC (1.22 EUR at Farnell).

Although its absolute accuracy (integral nonlinearity) specs are not 
that good, it has differential nonlinearity of 0.75 bit or less, so it 
is able to output a smooth envelope signal.

Tim Ressel schreef:
> Ouch, Paul. MAX541s are $25. Check out AD5061 at $6.78. Or is that a typo? MAX541 is a 16-bit DAC. 
>
> Also there is the trick of using a PWM output through a filter to produce a DAC-like output. Should be good enough for an EG output.
>
> --TimR
>
>
>
> --- On Sun, 1/4/09, Paul Maddox <paul.maddox.mail-list at synth.net> wrote:
>
>   
>> From: Paul Maddox <paul.maddox.mail-list at synth.net>
>> Subject: Re: [sdiy] Sliders and envelopes
>> To: "synthdiy DIY" <synth-diy at dropmix.xs4all.nl>
>> Date: Sunday, January 4, 2009, 1:02 AM
>> Maarten,
>>
>>   or could could do it with an AVR Mega8, 8 sliders and two
>> MAX541s.
>> This would give you TWO ADSRs with 12 bit resolution and
>> the ability to choose slope shapes (linear, expo, rev expo,
>> etc), very few parts required for that.
>>
>> Paul
>>
>> On 3 Jan 2009, at 21:50, Maarten Halmans wrote:
>>
>>     
>>> I would like to build an envelope generator with Alps
>>>       
>> sliders, I can only get these sliders in 10k log or 50k lin.
>> Is it possible to get normal times (something between 1
>> millisecond and  10 seconds) for the attack, decay and
>> release stages without using a large timing capacitor? Of
>> course I could go for a voltage controlled envelope
>> generator, but than a lot more components are involved and I
>> am not specifically looking for voltage control of these
>> parameters.
>>     
>>> Any ideas?
>>> Thanks,
>>> Maarten
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>>>       
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>   


-- 
Vriendelijke groet, 
Simon Brouwer. 

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