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| Convert 0..5v PWM to 6,5..11,5v |
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| Jan Audio:
Hi, i am using this 8 bit mcu PWM to generate a control value, the power supply is 12 volt. I need 6,5 volt to 11,5 volt range, how do i convert the 0 to 5 volt PWM range ? I could add exact 6 FETs and a bit bias, or try 5, only it is to expensive. How would you fix this ? thanks |
| Benta:
Integrate and level shift using a couple of opamps. |
| wraper:
You don't even need to level shift. Just output PWM in 55-100% range and use Sallen-Key filter with a gain of 2,3 https://electronics.stackexchange.com/questions/74877/gain-in-sallen-key-filter |
| ogden:
All you need - convert 5V PWM signal to 12V PWM using (logic) level shifter made out of few two transistors and as already said, use 55%-100% PWM range. On the output you may use same RC filter you already have. |
| Jan Audio:
--- Quote from: Benta on December 27, 2018, 04:31:42 pm ---Integrate and level shift using a couple of opamps. --- End quote --- That is what i ask for. --- Quote from: wraper on December 27, 2018, 04:39:27 pm ---You don't even need to level shift. Just output PWM in 55-100% range and use Sallen-Key filter with a gain of 2,3 https://electronics.stackexchange.com/questions/74877/gain-in-sallen-key-filter --- End quote --- Is that filter schematic for single supply ? --- Quote from: ogden on December 27, 2018, 04:53:30 pm ---All you need - convert 5V PWM signal to 12V PWM using (logic) level shifter made out of few two transistors and as already said, use 55%-100% PWM range. On the output you may use same RC filter you already have. --- End quote --- How would i do that ?, you have any schematic ? |
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