Automatic Bathroom Light with Back-up Lamp
Sometimes we forget to switch off the bathroom light and it remains on unnoticed for long periods. This automatic bathroom light circuit solves the...
Simple Digital Security System
You can use this simple and reliable digital security system as a watch dog by installing the sensing loops around your building. You have...
Remote Controlled Power-Off Switch
The remote controlled power-off switch circuit given here can disconnect the entire system from mains using the remote for the audio or video systems. This circuit uses a remote control to switch off electrical appliances by the help of a infrared receiver module.
Mains Supply Failure Alarm
When ever AC mains supply fails, this mains supply failure alarm circuit alerts you by sounding an alarm. It also provides a backup light...
Touch Free Timer Switch
This type of infrared proximity circuit is widely used as an electric switch where physical contact is not desired for hygiene purpose. For example,...
PIN Diode Based Fire Sensor
Here is a PIN diode based fire sensor that activates an alarm when it detects fire. Thermistor based fire alarms have a drawback; the...
Optical Smoke Detector
This optical smoke detector uses a low-cost, readily-available, slotted, through-scan, infrared photo-switch. When smoke is detected, the relay energises to activate the audio/visual warning...
Manual EPROM Programmer
The programmer devices required for programming the electrically programmable read only memories (EPROMs) are generally expensive. Here is a low-cost EPROM programmer circuit to...
Wireless Stepper Motor Controller
Here is a low-cost and simple wireless stepper motor controller using infrared signals. Using this circuit you can control the stepper motor from a...
Digital Frequency Comparator
Here’s a digital frequency comparator for oscillators that indicates the result through a 7-segment display and a light-emitting diode (LED). When the frequency count...
