can I connect a common anode 7 seg LED display for a circuit requiring common cathode?

Get a 9V battery and a 1kΩ resistor; and using the property that an LED will only light up with the current flowing the right way through it, work out which is the common terminal. (1kΩ is enough resistance not to do the LEDs any damage if connected the wrong way around with a 9V supply, but will still allow enough current for you to see the segments lighting up.)

You could build a circuit for running a common anode display from a common cathode driver, using seven PNP transistors and fourteen resistors (plus the seven ballast resistors for the LEDs) (make that 8, 16 and 8 respectively if you include the fractional point). It'll cost you more than a new LED display, though. If you have a common-anode display, try the 4543; which has a different pinout, but can be used with CA or CC displays.

The circuit shown will work OK from a 9V supply. You might want to increase the values of the 470Ω resistors if you are using a PP3 battery (smoke alarm type) as the battery will run out quickly.

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