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Fundamentals of Electrical Engineering and Strain gauges – Circuit Schematic
Fundamentals of Electrical Engineering and Strain gauges
If a strip of conductive metal is stretched, it will become skinnier and longer, both changes resulting in an increase of electrical resistance end-to-end. Conv...
ultrasonic cleaner circuit diagram – Circuit Schematic
ultrasonic cleaner circuit diagram
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Scalextric Lap Counter – Circuit Schematic
Scalextric Lap Counter
After getting some Micro Scalextric for Christmas and shortly after acquiring a vast mount of second-hand track from eBay I decided I needed a lap counter so I ...
Occupancy Detection on the Teton Short Line – Circuit Schematic
Occupancy Detection on the Teton Short Line
DETECTOR 2 was designed back in the mid `70s to be non-inductive, and to respond to any current from DC up to any reasonable frequency that we might want in the...
Garden Railway Sensors – Circuit Schematic
Garden Railway Sensors
A sensor in garden railway applications. Hall Effect sensors are the electronic equivalent of a reed switch. You can think of them as a cross between a reed swi...
SIMPLE LED THERMOMETER – Circuit Schematic
SIMPLE LED THERMOMETER
As shown, the circuit is powered by a 9-V battery, B1, but it can easily run off any 7- to 10-Vdc power supply. At the heart of the thermometer is IC1, an LM34 ...
ULTRASONIC RECEIVER – Circuit Schematic
ULTRASONIC RECEIVER
The 4046 PPL is used as the heart of a tunable ultrasonic receiver that can be used to locate unheard ultrasonic sounds. The receiver might also be used, along ...
AUDIBLE LIGHT METER – Circuit Schematic
AUDIBLE LIGHT METER
Low light on cadmium sulfide photocell (Radio Shack 276-116) produces series of clicks in miniature 8-ohm loudspeaker. As light increases, clicks merge into aud...
AUDIBLE LIGHT SENSOR – Circuit Schematic
AUDIBLE LIGHT SENSOR
741 opamp is connected as audio oscillator with Radio Shack 276-677 photocells in feedback circuits. When light strikes PC1, its resistance decreases and freque...
MICROPOWER RADIOACTIVE RADIATION DETECTOR – Circuit Schematic
MICROPOWER RADIOACTIVE RADIATION DETECTOR
In the absence of radiation, no current is drawn. At normal background radiation levels the power consumption is extremely low. The instrument may be left on fo...
Acoustic thermometer – Circuit Schematic
Acoustic thermometer
Acoustic thermometry is used where extremes in operating temperature are encountered, such as in cryogenics and nuclear reactors. The transducer is composed of ...
Electronic thermometer – Circuit Schematic
Electronic thermometer
This very simple circuit is an electronic thermometer using an inexpensive silicon transistor (2N2222) as the temperature sensor or probe. The circuit provides ...
900 KC FLAW DETECTOR – Circuit Schematic
900 KC FLAW DETECTOR
Attenuation of ultrasonic pulses boomed through test piece reveals presence and extent of internal defects, such as nonbonds between aluminum cladding and urani...
Controller keeps circuits cool – Circuit Schematic
Controller keeps circuits cool
Cooling an instrument or a device can improve the SNR (signal-to-noise ratio), and it can also prolong product life. For example, the dark-and-noise signal of a...
Ultrasonic Reflectance Detector – Circuit Schematic
Ultrasonic Reflectance Detector
This circuit detects motion within approximately 5 inches of a piezo-ceramic element ultrasonic transducer. The detection distance is much smaller than obtainab...
Flash Trigger – Circuit Schematic
Flash Trigger
The following is a (hopefully clear) description of the final version of the trigger used and a circuit diagram for anyone wishing to construct their own. So be...
Motion Detector – Circuit Schematic
Motion Detector
The motion detector circuit consists of two components, the emitter and the sensor/detector. The emitter is simply made up of an infrared emitting diode reverse...
Single Button Force Sensing Resistor – Circuit Schematic
Single Button Force Sensing Resistor
The FlexiForce sensor acts as a force sensing resistor in an electrical circuit. When the force sensor is unloaded, its resistance is very high. When a force is...
Ultrasonic anemometer Ultrasonic wind sensor – Circuit Schematic
Ultrasonic anemometer Ultrasonic wind sensor
This ultrasonic anemometer serves for the 2-dimensional capture of the horizontal components of the wind speed and the wind direction as well as the virtual tem...
Ion Chambers – Circuit Schematic
Ion Chambers
These "ion chambers" are nothing more than a bare wire stuck through a hole into a metal can! No special gas or sealing is required. For best performance it is ...