In this article I have explained a set up for testing MOVs which are special devices specified for absorbing instantaneous high surge currents that may accidentally occur in our mains electrical lines. The idea was requested by Mr. Kevin Technical Specifications I’m Kevin Montañez, a university Electrical Engineering student here in Cebu, Philippines. As I […]
Voltage Control and Protection
Grid Transformer Fire Hazard Protector Circuit
In this post I have explained a smart mains fire hazard protector circuit which can be used for preventing mains grid transformers from over heating and causing sparks or even burning due to a possible fire. The idea was requested by Mr. Ravindra Shedge Technical Specifications I am Ravindra Shedge from Mumbai. I am looking […]
Automatic Generator Choke Actuator Circuit
In this post I have explained a simple automatic generator choke actuator circuit using a straightforward delay OFF timer circuit and a solenoid device. The circuit was requested by Mr. Bob Perry. Technical Specifications I’m in need of a time delay schematic for the following project. I have an electric generator that I can start by […]
Automatic Voltage Regulator (AVR) Analyzer
The post below discusses an automatic voltage analyzer circuit which can be used for understanding and verifying the output conditions of an AVR. The idea was requested by Mr. Abu-Hafss. Technical Specifications I want to make an analyzer for Automotive Voltage Regulator (AVR). 1. The three wires of the AVR are connected to the corresponding […]
Using an NTC Thermistor as a Surge Suppressor
A Negative Temperature Coefficient (NTC) thermistor is a device which is able to suppress switch ON current surge due to its initial higher resistance at room temperature. However, as the NTC suppresses the initial surge current, it warms up causing its resistance to drop to nominal levels and this in turns allows the current to […]
Mains AC Overload protection Circuit for Voltage Stabilizers
In this article I have explained how to make a cheap yet effective mains operated AC overload and over-current protector circuit using very ordinary discrete components. Introduction I have published a few mains voltage stabilizer circuits in this blog, these units are designed and intended for safeguarding the connected appliances at their outputs. However these […]
