Electronic monitoring system with direct-current power supply

Electronic monitoring system with selective signal inversion

Electronic monitoring system with short-circuit protection

Electronic proximity sensor

Electronic sampler switch

Electronic shutter for a charge-coupled imager

Electronic status monitoring system for security containers

Electronic watch

Equalizing circuit for a sense amplifier

Error corrected error amplifier

Error detector circuit for indication of low supply voltage

Extended range current-to-time converter

Externally programmable, process and temperature insensitive thr

Fail-safe electronic polarized relay

Fail-safe one and only one signal checking circuit

Fail-safe pulse providing apparatus

Failsafe electrical circuitry

Failsafe feedback control system

Failsafe logic function apparatus

Failsafe train vehicle control signal threshold detector apparat