Driving pieces of shutter glass
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cd4070b.pdfXOR and X-NOR gateAdobe Portable Document Format - 1.22 MB - 01/15/2017 at 17:06 |
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Adobe Portable Document Format - 1.17 MB - 03/08/2016 at 14:18 |
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CD4049UB, CD4050B (Rev.pdfHex buffer: 4049 inverting, 4050 non-invertingAdobe Portable Document Format - 1.69 MB - 03/05/2016 at 21:58 |
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MAX680-MAX681.pdf+5V supply gives +10V, -10V outAdobe Portable Document Format - 82.43 kB - 03/05/2016 at 21:14 |
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Adobe Portable Document Format - 239.41 kB - 02/26/2016 at 18:28 |
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I hadn't looked at this project in awhile, and discovered that way back when I'd ordered some inverters and XOR gates! Free parts, just sitting there.
So I built a quick circuit with one of the hex inverters (CD4049) to drive the glass:
The formula for frequency is determined by R1 and C1 is F = 1 / (1.39xRxC) ... I tried with a 47k resistor and a 330k. In both cases, the glass appears dark.
What I want though, is for the glass to be able to dim. The correct driving wave form should look like this, but in order to vary the brightness/ dimming, needs a PWM signal.
Signal of input (channel 2) and output (channel 1) in and out of the inverter.
The signal is from an Arduino
analogWrite(shutterThree, 65);
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The current sensing circuit collection is a great reference.