| Created by |
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| Created | October 29, 2012 |
| Last modified | October 31, 2012 |
| Tags | 555 adc pwm |
A simple 2x555 PWM generator intended for use as an ADC in which a computer times the pulse length. U1 produces a chain of trigger pulses for U2, which produces pulses whose length is dictated by the voltage on the Vin node.
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keywordgeek - can you tell me a bit more about the purpose of this circuit please? I've run it and see that it does what you say, but I don't have a formal electronics or computer hardware design background, and I don't know what this circuit could be used for. is the sawtooth Vin just an example? What would you use the varying duty-cycle output pulses for? |
December 22, 2012 |
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The sawtooth Vin is as you guess just an example to show the variation in pulse length on the output. In real life you'd put a DC voltage from for example a sensor on the input. The purpose? On an abstract level, anything PWM can be used for, but on a specific level it's a simple analogue to digital converter such as you might have found in the joystick interface of an 8-bit home computer back in the 1980s. Such microprocessors had no analogue capability but they could measure time accurately. Thus when presented with a chain of pulses whose length was proportional to an analogue input they could time those pulses to measure the analogue input. |
December 27, 2012 |
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great - thanks. It makes sense now. Appreciate the reply |
December 30, 2012 |
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