[sdiy] Parallel 8 Bit DACS?

[ezion]

Groetjes Theo


On Fri, Nov 22, 2013 at 1:45 PM, cheater00 . <cheater00 at gmail.com> wrote:
> Hi Theo,
> thanks for your email. It was a nice read.
>
> On Wed, Nov 20, 2013 at 3:35 PM, ezion <ezion67 at gmail.com> wrote:
>> </lurk mode>
>> Hi Jack
>> Don't get your first question completely but you might want to look
>> for R2R DA circuits.
>>
>> As for adding VCA and VCF no magic but a "D" or "AD" type Envelope
>> plus VCA/VCF definitely works wonders, even better if you put a
>> distortion or wavefolder in front of it.
>> But ideally you want this on individual sounds not on the mix.
>> For cymbals and high-hat I find just a lonely VCF is usually enough.
>
> Why VCF and not an RC filter?
>
>> A wave folder offers more compression than a traditional distortion.
>
> Interesting - what sounds do you use it on?
>
>> The basic receipt for a wave folder: one 072 opamp, 2xLED and 3x10k resistors.
>> hookup:
>> Assuming symmetric supply for the opamp.
>> R1 from signal input to opamp +
>> R2 from signal input to opamp -
>> R3 as feedback resistor from opamp - to opamp out.
>> The 2 LED anti-parallel from opamp+ to GND
>> 10n parallel to the diodes takes of the sharp edge.
>> 33p parallel to the feedback resistor is always a good idea.
>> The input level sets the amount of drive.
>>
>> Expect a wide variety of electronic drum sounds from a single acoustic
>> drum sample.
>> Just me 2 cents
>> <lurk mode>
>> Groetjes Theo