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7805 regulator, 7805 voltage regulator
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7805 regulators, 7805 voltage regulators show
7805 regulator
01. * Vout: +5 V * Vin: +7 V min, +35 V max * Iout: 1 A * Case style: TO-220
Since the PIC doesn't have enough pins to run each segment of the display (all 96 of them) directly, the display is multiplexed. Only one digit is displayed at a time, but the digits are cycled through quickly enough to give the impression of a continuous display. I gave each digit a common cathode, and each segment of all the digits a common anode. The eight anodes (one for each of 7 segments, plus the decimal point) are connected via current-limiting resistors to output pins on the PIC. The 12 cathodes are connected to ground through standard NPN transistors (I used 2N3904) controlled by further output pins, since the PIC cannot sink enough current to connect the cathodes directly. Multiplexing with PICs is described by Microchip's Application Note AN557, which uses a 50Hz refresh rate for the multiplexed displays. I found this rather flickery, so used 80Hz, which corresponds to an on-time of just over 1ms for each digit.


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7805 regulators
02. The circuit is powered by a simple 5V supply using the 7805 regulator IC. I used a 240V 60Hz to 9V 3VA transformer, four 4N1001 diodes in a bridge rectifier layout, a 2200uF smoothing capacitor, and the 7805. The transformer and capacitor are probably rather larger than necessary for this project, since everything in the circuit is fairly low-power. Since the PIC doesn't have enough pins to run each segment of the display (all 96 of them) directly, the display is multiplexed. Only one digit is displayed at a time, but the digits are cycled through quickly enough to give the impression of a continuous display. I gave each digit a common cathode, and each segment of all the digits a common anode. The eight anodes (one for each of 7 segments, plus the decimal point) are connected via current-limiting resistors to output pins on the PIC. The 12 cathodes are connected to ground through standard NPN transistors (I used 2N3904) controlled by further output pins, since the PIC cannot sink enough current to connect the cathodes directly. Multiplexing with PICs is described by Microchip's Application Note AN557, which uses a 50Hz refresh rate for the multiplexed displays. I found this rather flickery, so used 80Hz, which corresponds to an on-time of just over 1ms for each digit.

 

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