Dark and Light Activated Relay circuit diagram
The potensiometer adjust the trigger on` level. The diode in the circuit diagram shows to be 1N914. This is ok if you have a light-duty relay, also the 1N914 is...
DIY Digital Thermometer Circuit
This diy digital thermometer circuit can measure temperatures up to 150?C with an accuracy of ?1?C. The temperature is read on a 1V full scale-deflectio....
Current Loop Transmitter For Temperature Sensor
Current loop interface has been widely used in industrial environment because it`s robustness. Noise resistance and fail detection capability? made it suitable....
Current Loop Light Level Detector
This circuit is two wire light level detector, we don`t separate wires for power this sensor system and for delivering the output signal. With current loop, we....
Coffee thermometer circuit
Why measure the temperature of the coffee? Well, coffee taste depends on two things. First, how strong the coffee is and second, how hot it is. The second....
Clap Triggered Switch
This is circuit of Clap Triggered Switch. When the circuit detects tap, or short whistle or a clap, this circuit will toggle the LEDs. 33k and 5K6 charge The....
Board System Monitoring for Temperature and Voltage Condition
This is a circuit of board system monitoring for temperature and voltage condition. It uses the NE1617A. The NE1617A is a 2 channel temperature sensor. It can....
Beam-break Detector For Camera Shutter or Flash Control
This circuit is presented as an alternative to the IR beam break detector featured in the June 2009 issue (Silicon Chip). In order to make it relatively insensi...
Barometer Signal Conditioner
The schematic diagram below show a complete barometric pressure signal conditioner that operates from a single 1.5V battery. We can get the best accuracy and....
Analog Compensation Circuit for PT100 RTD Temperature Sensor
There are some digital and analog that can be used for compensating a PT100 RTD nonlinearity. We can implemented the digital linearization by implementing the....
40KHz LASER BURST DETECTOR
This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm tra...
2N222 Transistor As Temperature Sensor
This is a simple Electronic thermometer circuit. This is a inexpensive circuit because probe or sensor that is used in this circuit is 2N2222 silicon ....
Sound-Controlled Relay
This is a relay circuit that detect the presence of sound to activate the relay. You can use this sound-controlled relay as voice operated switch, light....
One Direction Motion Sensor
This is a one direction motion sensor circuit. This motion sensor circuit is used to detects an object passing in one direction, ignoring an object that going t...
Electric Heater Thermostat
One Advantage of these two units is the Sensor can be placed Away from the heater, therefore sensing the Actual Room temperature, not the direct heat from the h...
A Fluid Sensor
For Conductive Liquids: These may simply consist of Two Parallel Metal Plates. If the Container is Metal, that could act as one of the plates. NOTE: A Suitable ...
Transform electromyographic signals into music
Developers of human-computer interface technologies have recently been focusing on the use of bio-electrical signals (eye movement, electrical activity of muscl...
The CDMS II Veto Readout Electronics
A Prototype Sample and Hold Circuit -The original idea for the veto front end amps was to continually sample the input pulse height and hold the pulse height fo...
Catmans Litterbox
Both versions have the schematic attached. However, the resolution of the schematic isn`t that great. I would recommend saving the image above or downloading it...
Transmitter Precision Thermocouple Amplifier Circuit
This circuit is shows how a low drift preamplifier can be added to improve the measurement resolution of a thermocouple. The preamp is powered from the referenc...