darren adcock
- Sep 26, 2016
- 463
- Joined
- Sep 26, 2016
- Messages
- 463
Hi all, I've been asked to make a device which allows a rapper to produce gates/triggers to interface with midi equipment. After an initial discussion we decided that we could use certain or a series of volume and frequency windows which would activate the gates/triggers. This would all be derived from vocal's via a microphone. It is preferred that the circuit runs off batteries.
Usually in a project I head straight in and then have to back paddle when i get stuck. So thought I'd try and start with a post of how I think i need to achieve this, see what folk here think (It's new ground for me) and try and get the circuit drawn before i start plugging things in.
How I've imagined things so far;
For frequency detection
- SM58 - Pre amp/buffer - frequency to voltage converter (LM331) - window comparator - gate buffer with a comparator input leading to 40106's for both trigger and gate out ( this circuit is from MFOS here http://musicfromouterspace.com/analogsynth_new/HOT_TIPS/PDF/gatebuffer20090923_assembly.pdf )
For dB detection
Is the same as above but the frequency to voltage converter is changed to a single op amp amplifier to amplify the mic signal into a larger voltage range
Usually in a project I head straight in and then have to back paddle when i get stuck. So thought I'd try and start with a post of how I think i need to achieve this, see what folk here think (It's new ground for me) and try and get the circuit drawn before i start plugging things in.
How I've imagined things so far;
For frequency detection
- SM58 - Pre amp/buffer - frequency to voltage converter (LM331) - window comparator - gate buffer with a comparator input leading to 40106's for both trigger and gate out ( this circuit is from MFOS here http://musicfromouterspace.com/analogsynth_new/HOT_TIPS/PDF/gatebuffer20090923_assembly.pdf )
For dB detection
Is the same as above but the frequency to voltage converter is changed to a single op amp amplifier to amplify the mic signal into a larger voltage range