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3 Simple Proximity Sensor Circuits

Three useful proximity sensor concepts are explained here, the first concept is based on an ordinary opamp LM358, the second one using IC LM567 which functions with a phase locked loop principle ensuring very accurate response for the detection. The third circuit works using the ubiquitous IC 555. Let’s learn each one with a step … Read more3 Simple Proximity Sensor Circuits

Using TSOP17XX Sensors with Customized Frequencies

We know that the center or band-pass operating frequency of a TSOP17XX IR sensor is assigned to a particular frequency which makes it difficult to use these sensors for designing unique or customized frequency based remote control circuits. In this post we will try to figure out an idea for enabling these sensors to work … Read moreUsing TSOP17XX Sensors with Customized Frequencies

Bluetooth Car Ignition Lock Circuit – Keyless Car Protection

This circuit will allow the user to lock his car ignition using his phone Bluetooth, meaning the ignition can be locked/unlocked only through a specific code from the user’s cellphone Bluetooth. Overview In one of my earlier posts I have already explained how to hack a Bluetooth headset and use it for any desired switching … Read moreBluetooth Car Ignition Lock Circuit – Keyless Car Protection

Power Line Communication Remote Control Circuit

This little circuit will enable a remote controlled switching of an appliance situated in the next room using the concept of power line communication, which involves the use of home mains wire for transferring data in the form of high frequency pulses through the mains wire, superimposed over the existing mains frequency. Power Line Communication … Read morePower Line Communication Remote Control Circuit

Wireless Home Security Circuit – Solar Powered

The article discusses a remote controlled wireless home security circuit using which enables the detection of a possible intrusion way in advance depending on how and where the remote sensors are positioned over the selected strategic locations and the desired distance from the house. The idea was requested by Mr. Dave Monette. The request is … Read moreWireless Home Security Circuit – Solar Powered

3 Cool Sound Activated Switch Circuits

The post details 3 simple sound activated relay switch circuits which can used as a module for any system that might be assigned to trigger by detecting some kind of sound pressure level.Or simply applications  such as a  voice activated alarm security circuit. 1) Circuit Objective Utilizing this basic sound activated switch design, toggling a … Read more3 Cool Sound Activated Switch Circuits

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