Switch ICs with Adjustable Current Limiting Schematic Circuit Diagram

Transistors are often used for switching power supply voltages. MOSFETs are most often used, since they have low ‘on’ resistance, and they are also available for large currents. What a discrete transistor or MOSFET lacks are protective functions, such as current limiting and overtemperature protection. The MIC2545A from Micrel can provide a solution to this[…]

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Lock code unit with auto reset

The code unit, which operates with was designed to control an electromagnetic door lock with a four-digit code. It resets automatically after a short period. The keys that set code are designated S1-84 in the diagram. Each of them is linked to a bistable (flip-flop) in IC1. The connections are arranged so that when key[…]

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