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The 555 will naturally run from 50% to about 100% duty cycle. All you have to do is invert the the 555 output to get about 0% to 50% duty cycle.
You may have to change your control signal around to work with that.
Hi,
My name is Fred and I have started to write a blog about the circuits and theory used in vacuum tube guitar amplifiers.
Link -> Fred's Vacuum Tube Amplifier Blog
I have the first four posts up that cover the basics of a triode, a generic triode gain stage, and how to shape the...
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