In this post we learn about a simple circuit which can be customized to generate a wide range of noise frequencies. Noise refers to unwanted electrical signals in a pretty […]
Zero Crossing Detector Circuit
Many complex circuits and integrated circuits contain zero crossing detectors, but we will deal only with the detector here. The detector produces a pulse each time the mains voltage goes […]
Field Strength Meter Circuit using a BJT
Simple field strength indicator circuit enables us to check whether an RF based transmitter is transmitting the signal or not. If any fault is present, that is quickly checked. Basically […]
How to Protect Loudspeakers from Over Current Surge
There are plenty of ways to protect loudspeakers against the switch-on ‘plop’. Many of such ways depends on a clamp circuit moving across the input of power amplifier, so that […]
Wire Current Detector Circuit
This simple circuit can be used for detecting 50 Hz current inside a conductor without physically connecting with the conductor. You just have to bring the L1 coil near the […]
Ferrous, Non-Ferrous Metal Detector Circuit
The function of this adsorption type metal detector is to indicate the presence of ferrous and non-ferrous type metals. Its functionality depends on the absorption of magnetic energy. An inductor […]