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When two synchronous BCD counters are cascaded, the output of the present stage is connected to count input of next higher order decade counter . For BCD ripple counters, he output of the present stage is connected to count pulse input of next higher order decade counter.

The flip-flop holding least significant bit receives incoming count pulse input and rest of flip-flops receive output of previous stage as count pulse input in case of ripple counter.

Op-amp used acts as a summing amplifier as well. It operates in negative feedback. Current flowing through each resistor is summed and given as negative feedback to op-amp.

Dual Slope Integrating Type ADC is used in digital voltmeter due to its accuracy.

Most accurate ADC is Dual Slope Integrating Type

Flip-flop in memory cell is similar to SR Latch. It does not operate on clock.

Parallel-in Serial-Out Shift Register stores parallel data and gives serial out data.

Consider circuit with a lamp and 2 switches connected in parallel. The lamp will turn ON if any of the two switches is closed. This indicates Logic OR

In 3-variable K-map, 8 squares in total .
When 4 adjacent squares are combined, the expression is actually logic sum of 4 minterms.
It results in a term with single literal.

Product-Of-Sum expression is the logic addition of Maxterms. Maxterms are logic AND of variables. Hence POS can be implemented using an array of AND gates followed by OR gate

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