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Converting GATE/CV to audible pulse
Old 30th September 2019
Gear Maniac
gjvti's Avatar

Converting GATE/CV to audible pulse

I need to convert GATE or/and CV to audible pulse 440 Hz, for example, while gate is open. And I would like to do that without any external power supply - so ready made modules are not an option. GATE levels in my case are available as 5V or 12V.
On the net I found the following diagram
but either I did something wrong or this doesn't work - I'm getting same spikes/clicks when GATE is opening or closing either directly from GATE either through this schematic.
Can anyone help with this?
Old 30th September 2019
Gear Guru
Derp's Avatar
CV/Gate are signals being transmitted to analog devices. Clicking on the gates is normal since it's essentially a pulse wave being opened and shut. CV is just a constant voltage for the duration of the notes, so not enough information to generate an audible waveform.
Old 2nd October 2019
Lives for gear

You need a large capacitor between the positive and negative rail for this not to click, since gate is being used for power and you are disruptively turning power on/off with a square edge.. it will click!
Old 8th October 2019
Gear Head
mskala's Avatar

It'll click anyway - that's what turning a signal on or off suddenly means. But you could probably hide most of the click by putting the output through a low-pass filter, and if you really must have no power supply, one or two stages of basic passive RC filtering (resistor in series, capacitor in parallel) would make sense. Something like the attached.
Attached Thumbnails
Converting GATE/CV to audible pulse-screenshot_2019-10-08_13-46-32.png  
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