Relays are used to connect, or disconnect, ring generators to-and-from telephone lines. If the two points are at different potentials, there are high-current transients at the moment of contact. This ...

The circuit in this Design Ideagenerates a zero-crossing pulseoff the ac mains and provides galvanicisolation. The falling edge of the outputpulse happens at approximately 200μsec before the zero ...

To properly control ac sources using solid-state devices, you need a pulse to signal the start of the ac’s rising edge. Most of the time, however, tremendous noise levels plague power lines. There ...

Rohm recently introduced a low-power 600V-tolerant zero-crossing detection chip, intended to cut energy wastage in home appliances by reducing sense current through the high voltage monitoring ...

Fig 1. This zero-crossing detector circuit generates the control pulses needed to turn on triacs that require negative pulses for switching. Fig 2. Designers can use ...

For one-off projects or prototyping, it’s not too hard to find a wall wart or power supply to send a few joules of energy from the wall outlet to your circuit. Most of these power supplies use a ...

Rohm recently introduced a low-power 600V-tolerant zero-crossing detection chip, intended to cut energy wastage in home appliances by reducing sense current through the high voltage monitoring ...