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Infra-red Receiver
This very simple infra-red receiver is intended to form an infra-red remote control system with the simple infra-red transmitter described in this site. The system does not use any kind of coding or...
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Mains Slave Switcher
There are many situations where two or more pieces of equipment are used together and to avoid having to switch each item on separately or risk the possibility of leaving one of them on when switching...
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Simple Telephone Central Project
This simple telephone switching system is designed by Dr. Mustafa Kemal PEKER for training purposes. All responsibility is belong to user. Schematic and code is under GNU public licence. Cannot be used...
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Pipe Descaler
For many years now, magnetic (or electromagnetic) water descaler devices have been showing up on the shelves of Home Improvement and other DIY stores all over Europe. Despite the numerous studies...
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Adjustable High-Low Frequency Sine Wave Generator
This circuit uses the versatile MAX038 function generator. Although in this circuit some of the advanced characteristics of this IC are disabled, you can generate Sine, Triangle, Square waves...
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Transcutaneous Electrical Nerve Stimulator (TENS)
A Transcutaneous Electrical Nerve Stimulation (TENS) device is, put bluntly, a machine for giving electric shocks. The author was prescribed such a device on loan by his orthopaedic specialist. The...
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Cat And Dog Repellent
The electronic dog repellent circuit diagram below is a high output ultrasonic transmitter which is primarily intended to act as a dog and cat repeller, which can be used individuals to act as a...
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USB-Powered PIC Programmer
This simple circuit can be used to program the PIC16F84 and similar “flash memory” type parts. It uses a cheap 555 timer IC to generate the programming voltage from a +5V rail, allowing the circuit to...
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Heart Rate Monitor
Strictly speaking, this simple circuit shouldn’t work! How could anyone expect an ordinary light dependent resistor photo cell to ‘see’ through a fingertip in natural daylight and detect the change in...
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Digital Main Voltage Indicator
Continuous monitoring of the mains voltage is required in many applications such as manual voltage stabilisers and motor pumps. An analogue voltmeter, though cheap, has many disadvantages as it has...
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