Considering Circuitry of SECTION X : Scrutinise the circuit and gain and underst

ID: 2083761 • Letter: C

Question

Considering Circuitry of SECTION X :

Scrutinise the circuit and gain and understanding of its intended operation. Do

this by identifying the sub-circuit blocks.

By including datasheet information where needed, calculate expected voltages at

points A, B and C for the extreme settings of the potentiometer. Also, calculate

the voltage from the potentiometer (threshold) at A, at which you expect the

comparator’s output to change. What role does the switch SW1 play? Determine

any expected timing values in the circuit.

Considering Circuitry of SECTION Y :

By looking at the datasheet of the 4017, work out and explain the expected

behaviour of this section of circuitry.

upa 7 239 12 Ulb ula. SECTION X 5 12k MON TOR cer SV 320 O2 5-9 SECTION

Solution:

The values of voltages at A, B, C are calculated as follows,

Considering OPAMP as Ideal,

by the virtual ground concept voltage at both input terminals is same

so Voltage at A is 5 V as equal to zener voltage which acts as a voltage regulator

VA = 5 V

Voltage at B is given by

V B = (1 + Rf/R1) VA = (1 + Rf/R1) VA= (12/6) * 5 = 10 V ... The potentiometer is considered to be at the center.

To calculate the voltage at C consider switch SW1 is not connected,

so, By S-R latch configuration it will give 10 V

so, Voltage at terminal c is VC = 10 V

So Now,

If we close switch SW1 then input of the NAND gate of the latch will be grounded so output of that gate will be

1 which produces output at Terminal C always to be 0 V.

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