Learn and build electronic circuits
This magnetic proximity switch circuit can be used to switch a load ON/OFF when a magnetic field is detected. How the Circuit Functions The Magnetic Proximity Switch Circuit is based on a magnetic reed switch(S1) as being the proximity sensor. A monostable multivibrator calculated on NE555 (IC1) and a toggle flip flop in line with … Read more
This light activated switch circuit, automatically switches ON a connected lamp when night falls, and switches it OFF during day break. It has many applications, it could be used as a photocell and to off the light in a room or turn on the radio when it is dawning, etc. Working of light activated switch. … Read more
This PIR motion sensor circuit detects a human presence and can be used to sound an alarm when a human is detected within its range. This is my smallest, cheapest, foolproof etc; movement detector with dim-switch that works in all conditions. In the drawing “tv” means “or similar”. Enjoy! I have operated the circuit with … Read more
The following post explains how the IC LM317 can be used for automatically controlling 7 segment LED display intensity with respect to the variations in the ambient light conditions, detected through a photo transistor. When it detects a relatively high light intensity, the based and emitter voltage of T2 increase. When the base voltage of … Read more
The following explained automatic day night switch circuit using a Bi-Metal strip and an LDR is able to automatically illuminate your porch light or power up some other equipment once the ambient lighting falls below the specific intensity. A light dependent resistor is employed in sequence with a relay. How it Works The resistor possesses … Read more
This gas sensor circuit is going to identify just about all pollutants available as gaseous material when it is more than a specific predetermined limits. Just to illustrate the suggested circuit can be applied for sensing the LPG gas leakage in a your home or the increased signs of CO2 contamination in excessive traffic afflicted … Read more