Zetex Circuit Simulator download

Allows you to draw a circuit which can be tested in simulation
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Alternative software

5Spice Analysis
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Use analog circuit simulation for the professional circuit designer.

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Build circuits with resistors, light bulbs, batteries, and switches.

PowerWorld Simulator
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Murata EMI Filter Selection Simulator
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It shows how to use Murata EMI Filters and Chip Capacitors in a circuit.