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Deer Repellent/ Seismic Sensors – Circuit Schematic
Deer Repellent/ Seismic Sensors
By gluing a standoff to the center of the cone, an inexpensive 2", 8 ohm speaker becomes a vibration sensor with a naturalresonance below 100Hz which is quite g...
Rain Detectors – Circuit Schematic
Rain Detectors
This rain detector will give you a heads-up the instant it starts to rain, hopefully giving you time to close windows and bring in possessions. The battery-powe...
Lightning Detectors – Circuit Schematic
Lightning Detectors
The following circuit is an improved version of my original Lightning Detector designed to run on a 5 volt supply. The new circuit features a superior RF sectio...
Ultrasonic Movement Detector – Circuit Schematic
Ultrasonic Movement Detector
This ultrasonic movement detector circuit uses a crystal locked circuit to get maximum performance from the ultrasonic transmitter. However, the detection circu...
I2C Interfacing Acceleration Sensing PCF8591 – Circuit Schematic
I2C Interfacing Acceleration Sensing PCF8591
This part of the I2C interfacing project focuses on building an acceleration sensor, but in the process it also explores two other issues: advanced use of the P...
70 Interesting Circuits – Circuit Schematic
70 Interesting Circuits
This circuit will detect AC line currents of about 250mA or more without making any electrical connections to the line. Current is detected by passing on of the...
Diagram from MPL115A2 – Circuit Schematic
Diagram from MPL115A2
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Build a Lightning Detector – Circuit Schematic
Build a Lightning Detector
An audio amplifier connected to the output will emit loud click sound for each lightning strike detected. When severe storms are approaching, this receiver will...
Lightning Activated Camera Shutter Trigger – Circuit Schematic
Lightning Activated Camera Shutter Trigger
This circuit is used to trigger a camera`s electronic shutter circuit when a flash of lightning is present. This circuit would also work for photographing firew...
SUN TRACKER HITEC SERVO ACTUATOR CONTROLLING ALIGNMENT SOLAR WING PANELS – Circuit Schematic
SUN TRACKER HITEC SERVO ACTUATOR CONTROLLING ALIGNMENT SOLAR WING PANELS
The giant (by radio control standards) servos above are shown adjacent to a Nokia 3310 mobile phone to give an idea of the scale. The arms are 12cm long - perfe...
dual slope sampling SE – Circuit Schematic
dual slope sampling SE
If you had time to experiment with the ALF type SE circuit you may have discovered some of its shortcomings with regard to a Power Smart Head adaptation. The pr...
force feedback interfacing – Circuit Schematic
force feedback interfacing
The first thing I wanted to implement was the control force relation with airspeed. The faster the air flows over the control surface, the more force is needed ...
Heart Monitor (ECG Sensor Signal Amplifier/Conditioner) – Circuit Schematic
Heart Monitor (ECG Sensor Signal Amplifier/Conditioner)
Using the circuit depicted in the schematic diagram below we can monitor the heart pulses of patient. This circuit buffer and amplify the heart pulses, and the....
Relay Circuit Detects Light Change – Circuit Schematic
Relay Circuit Detects Light Change
Configured with capacitive coupling (by inserting a small cap between photo-transistor and bipolar transistor), this relay circuit will respond only to rapid.....
Light Level Droplets Detector – Circuit Schematic
Light Level Droplets Detector
This is a circuit of Low-Light Level Drop Detector. This circuit utilize self-biasing configuration to detect small changes in light level. This circuit.....
Resistance Thermometer Current Loop Transmitter – Circuit Schematic
Resistance Thermometer Current Loop Transmitter
Resistance temperature sensor (RTD, resistive temperature device)  comes in NTC (negative temperature coefficient) and PTC (positive temperature coefficient).....
4-20mA Current Loop Bridge Sensor Transmitter – Circuit Schematic
4-20mA Current Loop Bridge Sensor Transmitter
Bridged resistive sensing elements is common in resistive type sensors/transducers. This sensor type need a biasing voltage to operate. LM10 provide low.....
Logarithmic Light (Photodiode) Sensor Signal Conditioner – Circuit Schematic
Logarithmic Light (Photodiode) Sensor Signal Conditioner
There are many measurement system that would be more suitable if we use logarithmic scale, especially when we try to mimics human sensory response. Most.....
LM10 Thermocouple Current Loop Transmitter – Circuit Schematic
LM10 Thermocouple Current Loop Transmitter
Current loop transmitter is the term associated with sensor system that is used in industrial 4-20mA current loop technology. This transmitter contain the.....
CD4093 Water Level Sensor (Detector) – Circuit Schematic
CD4093 Water Level Sensor (Detector)
This water level sensor (detector) circuit uses a standard NAND logic gate to produce oscillation and to detect the water level. Oscillation is included inside....