Ultrasonic-transceiver
This ultrasonic transmit/receive circuit operates at 40 kHz. ...
Sonar-transducer-switch
This submersible sonar positioning apparatus generally consists of dual-opposed ultrasonic transducers, alternately excited, with return signals processed and ...
Ultrasonic-transceiver
The LM1812 is a complete ultrasonic transceiver on a chip designed for use in a variety of pulse-echo ranging applications. The chip operates by transmitting a...
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...
Ranging-system
Combine an electrostatic transducer with an ultrasonic transceiver IC to build a ranging system that senses objects at distances from 4 inches to more than 30 ...
Digitizer
If the tube is level with respect to gravity, the bubble resides in the tube"s center and the electrode resistances to common are identical. As the tube shifts...
Thermometer-adapter
A simple op amp and silicon diode are the heart of the temperature-to-voltage converter that will permit you to use an ordinary voltmeter-either analog or digi...
Simple-linear-thermometer
The thermistor network specified eliminates the need for a linearity trim-at the expense ...
Electronic-thermometer
This circuit uses the +5 V reference output and the op amp to level shift and amplify the 2.1 mV/°C Tempco output into a voltage signal dependent on the amb...
Differential-thermometer
The differential thermometer uses two probes and shows the temperature difference betw-een them, rather than the exact temperature. ...
Two-simple-temperature-to-time-converters
Both of these converters use CMOS inverters. Figure 105-1A shows a free-running circuit having both the pulse duration and pulse pause dependent on temperature...
Temperature-sensor
The temperature sensor provides an input to pin 3 of the NE5037 of 32 mV/°C. This 32 mV is the value of one LSB for the NE5037. The LM334 is a three-termina...
Thermocouple-multiplex-system
To decouple the sensors from the meter amplifier, either a reference junction at ooc or a bucking voltage set at room temperature may be used. The latter metho...
Electronic-heat-sniffer
Sensing element Ql is a 2N3904 general-purpose npn transistor, although any general-purpose npn unit in a T0-92 style case will do. IC1, an LM334, supplies Ql ...
Piezoelectric-fan-based-temperature-controller
The fan employed is one of the new electrostatic type which is very reliable, because it contains no wearing parts. These devices require high-voltage drive. W...
Proportional-temperature-controller
This temperature controller operates as a pulse snatching device, which allows it to run at its own speed and tum on at the zero crossing of the line frequency...
Temperature-controuer
When power is applied, the thermistor, a negative tc device, is at a high value. A1 saturates positive. This forces the LT3525A switching regulator"s output lo...
Servo-sensed-heater-protector
This circuit responds quickly enough to prevent damage from most overloads. C 1 "s input is connected to the output of the LT1088 servo circuit. If the LT1088 ...
Optically-int-erfaced-ring-detector
This ring detector, utilizing a neon-LDR (light dependent resistor) optocoupler, simplifies inter ...
Cable-tester
This compact tester checks cables for open-circuit or short-circuit conditions. A differential transistor pair at one end of each cable line remains balanced a...