The circuit presented here can be used in PCOs for displaying the actual bill. The comparative disadvantages of the presented circuit are as follows:
1. The calculator used along with this circuit is required to be switched ‘on’ manually before making a call.
2. Certain manual entries have to be made in the calculator; for example, for a pulse rate of Rs 1.26, number 1.26 is to be entered after switching ‘on’ the calculator followed by pressing of ‘+’ button twice. However, possibility exists for automating these two functions by using additional circuitry.
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Fig.1 and Fig.2 are the same. Fig.1 description does not match with the Figure.
We have corrected Fig. 1.
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