May be ordered from;
Peter H. Anderson
Dept of Electrical Engineering
Morgan State University
Baltimore, MD 21239
$7.00 plus $1.50 postage.
Intended for undergraduate electrical engineering students with a background in circuit analysis and knowledge of operational amplifier circuits. Used for six hours of lecture to electrical engineering students taking thermodynamics. Contains three laboratory based assignments.
Includes;
. 1. Temperature measurement using NTC thermistors. Discusses 2, 3 and 4 point models, solving simultaneous equations to determine constants, typical circuits, design of thermostat with hysteresis.
2. Thermal considerations in using semiconductors. Discusses power derating curves, derivation of thermal resistance from junction to case to ambient. Use of heat sinks. Use of forced air.
3. Use of LM339 temperature sensitive diode, design of gain and offset circuitry to interface with analog to digital converter spanning range of 0.0 to 5.0 Volts, use of 4051 analog multiplexer under control of printer port to make up to eight measurements.
4. Running NTC thermistor in self heat mode to detect air movement and as fluid detector.
5. Data sheets include LM324, LM335, LM336, LM339, LM340, LM399.