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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Square Phaser
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JingleJoe



Joined: Nov 10, 2011
Posts: 878
Location: Lancashire, England
Audio files: 14

PostPosted: Thu Nov 29, 2012 3:14 am    Post subject: Square Phaser Reply with quote  Mark this post and the followings unread

This is a circuit I came up with while my internet was down for a month, it's very simple.
Two monostable circuits control the phase relationship and pulse width (or duty cycle) of the square wave applied to the input. However, there will be significant timbral changes caused by changing input frequencies. I class this as a feature Wink as this circuit is intended to create a more interesting sound from a simple square wave.
I've come up with a way to overcome the effects of frequency on this circuit: Make the control resistors frequency dependant, I think they could be replaced with transistors and a frequency-to-voltage circuit (I'll post that later) could then provide a CV to control the time periods of the monostables.
I haven't tested that but it should work in theory.

The posted component values are intended for use with frequencies around 200Hz and below, the resistors marked phase and duty cycle are intended to be potentiometers so you can adjust the phase and pulse width for different frequencies, you could also replace them with LDRs! Smile

P.S. R3 is unnecesary and the graph doesn't correspond with the posted component values, it's just an example of what you can do.


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