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Thanks for the input. I've used this project with other students using the attiny85 and one of the problems I asked them to solve was this issue. You'll glad to know they came up with the solution you have. The next group will be looking at manipulating PWM with a view to determining the range of PWM that actually produce a visible modulations of intensity.
Arduino Audio Output
Altoid Tin Quiet Alarm
Program an ATtiny with Arduino
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