SE 207: Modeling and Simulation Lab # 2:Basic Operations of the Analog Computers

Objectives of Experiment 2 To learn the basic analog computer operations Summing Integration To be able to some problems involving these operations

Equipment GP-6 analog computer Power Supply Connecting Wires

Summing Operation Background Given a number of voltages E 1,E 2,..E n Compute their (weighted) sum

Summer Amplifiers 1-6 can be used for summers Amplifiers 1,2,3,4 can be used for integrators, summers or inverters Amplifiers 5 and 6 can be used as summers or inverters Two values of resistances  Three possible ratios (10, 1, 0.1) K Feedback resistance R f Input resistance R 1 e1e1 e3e3 e2e2 R2R2 R3R3

Summer ABCABC

ABCABC 1 0.1

Integrator K Feedback Capacitor C f Input resistance R 1 e1e1 e2e2 R2R2 When the feedback element is a capacitor then the circuit acts as an integrator. The initial condition is specified by the initial charge in capacitor

Integrators The feedback element is a capacitor ABCABC IC

Part 1: Verify Summing Operation See page 13 of lab handout

Part 1: Summer with four inputs

Part 2: Verify integrator Operations See page 13 of lab handout

Integrators The feedback element is a capacitor A=10V IC 0.05

Report Give all details, diagrams, procedure, results, comments Title page Introduction Part 1: The theoretical results The experimental result Comparison Part 2: The theoretical results The experimental result Comparison Conclusions