Answer Happy

Posted: **Tue Jun 07, 2022 9:05 am**

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Figure 17-25 shows a DC voltmeter with a high degree of use of the BIFET operational amplifier. It is assumed that the output voltage is well adjusted by zero point adjustment. What is the input voltage at the time of full-scale deflection at the position of each switch?
What is the input voltage?
Please write down the solution to the problem in detail.
Vcc +15 V ZERO ADJUSTMENT 3 Vin 2 COMMON O 25 ΚΩ 1 LF355 7 VEE –15 V R₁ 10 Ω 6 A R₂ 100 Ω ΖΞ 17-25 100 ΜΑ FULL SCALE R3 1 ΚΩ R₁ 10 ΚΩ R5 100 ΚΩ