[sdiy] favorite adsr?

[Dan Snazelle]

thanks guys

as i said...this was just something I had heard and I was never sure about the validity of the claim.

so i guess i should just change my question. What are peoples favorite ADSR's to build?

(cmos or not)

thanks






----------------------------------------
> Date: Fri, 29 May 2009 21:48:55 +1000
> From: stewpye at optusnet.com.au
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] favorite adsr?
>
> Hi Dan,
>
> To my knowledge it is the ability to charge/discharge the capacitor
> which determines how fast the EG is. Here is my thoughts on the topic.
> Someone please correct me if they are flawed...
>
> If you had a common emitter transistor arrangement for the attach
> phase resistor the charging time would be dependant on the collector
> transistor, and I've seen this type of circuit using a 1k pullup
> (collector) resistor. However if you had whatever logic necessary
> feeding an emitter follower transistor then you could get much faster
> charge (attack) times.
>
> If you are using logic gates then the charge rate is determined by the
> output current ability of the device used. In the EG design that I
> posted a schematic of a few weeks ago I ended up putting 3 CMOS
> inverter in parallel for the attack phase. I have not tested it though.
> After doing that I decided to use an AVR microcontroller for the logic,
> and have that driving charge/discharge transistors.
>
> The above may not have shed much light on your question. Basically, if
> whatever is charging the timing capacitor is not capable of providing
> sufficient current, then the Attack may not be as fast as you would like.
>
>
> Regards,
> Stewart.
>
>
> Dan Snazelle wrote:
>>
>> i am going to be testing out ADSR'S all weekend and i have heard (maybe wrongly) that transistor based ADSR's are quicker/snappier.
>>
>> is this true? any recommendations on circuits to try?
>>
>> thanks
>>
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