[sdiy] CV outputs from 3.3V and 5V uC systems

Roman Sowa modular at go2.pl
Wed Sep 16 16:40:00 CEST 2020


The summer is what the name says. There are always other sources going 
to this summer, either externally or from internal trimming. It's not 
that the oscillator will suddenly stop if -0.1V will be applied to the 
expo CV input.

Roman


W dniu 2020-09-16 o 15:49, MTG pisze:
> Pitchbend is what I was curious about. Is it safe to send a negative 
> voltage to a (summer) in another module? I don't have experience with 
> this, but if a CV (elsewhere) needs to be only "bent down" using this 
> module, how is it done?
> 
> GB
> 
> On 9/16/2020 6:04 AM, Roman Sowa wrote:
>> Hello Spiros and list,
>> first of all, you don't just put "any off the shelf DAC" in a decent 
>> MIDI2CV converter. If you want 10 octave range then too low power 
>> supply is the least of your challenges.
>>
>> my advice is:
>> 1. yes, this is the best way. Do nothing and have 5 octaves (or more 
>> like 4.5) with some usability
>> 2. if you really want to go that way, there are full-contained power 
>> boosters, even making +/-15V out of 5V, in a form of small SIP device, 
>> or even SMD chip. Just add some additional filtering and you're done. 
>> It will have noisy output, but it's so easy to have whatever voltage 
>> converter nowdays.
>> 3. negative CV range is useful when someone wildly twists pitchbender 
>> at the lowest note. But -3V seems like overkill. OTOH who told you it 
>> cannot be -10V to +10V. Everything has its uses, pitch CV is just one 
>> example. In fact you could make it switchable like +/-10, +/-5, 0..5, 
>> 0..10, -5..10, -10..10 etc.
>>
>> You don't need 100mA for that. If you think you do, search for another 
>> parts. I'd say more like 10mA is your goal.
>>
>> Roman
>>
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