Simple Metal Detector Circuit

In this post we will how to make a simple metal detector circuit at home This metal detector is a low sensitive type  can be powered by a battery 3 to 15V, and may be constructed employing four exclusive OR gates from a CMOS integrated circuit 4030. The gates have been connected as two oscillators […]

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Light Activated Switch Circuit

This light activated switch circuit relay is activated only in the presence of light. 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 The photoresist / LDR whose ohmic value […]

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PIR Motion Sensor Circuit

The post discusses a simple PIR motion sensor circuit shared by one of the interested members of this blog.   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 2½-9V, but maybe ca 5V […]

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Automatic Day/Night Switch Circuit using Bi-Metal Strip and LDR

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. The resistor possesses a value above […]

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