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Old 30th September 2019
  #1
Gear Maniac
 
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Converting GATE/CV to audible pulse

Hello,
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
http://www.frocenter.com/wp-content/...5/12/NE555.png
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?