TC64X/TC64XB Evaluation Kit for Fan Speed Controllers:  This is a complete evaluation board for evaluation and prototyping brushless DC fan control circuits using the TC642, TC646, TC647, TC648, and TC649 BDC fan controllers.  (app note added 3/05)

TC74 Demo Board for Tiny Serial Digital Thermal Sensor:  This allows the user to evaluate the functionality of the tiny TC74 thermal sensor and perform comparative evaluations against other thermal management solutions. Easy-to-use software provides a visual representation of temperature profile and can be interfaced with any PC.  (app note added 3/05)

Technique Measures Small Capacitance:  09/01/97 EDN-Design Ideas  / (added 3/03)   

Telephone Test Circuit with Audio Mixer:  get Telephone audio to mixer or send audio to Telephone (added 5/02)

Temperature monitor measures three thermal zones:  12/11/03 EDN Design Ideas  /  (added 1/05)  You can use an ADT7461 single-channel temperature monitor; an ADG708 low-voltage, low-leakage CMOS 8-to-1 multiplexer; and three standard 2N3906 pnp transistors to measure the temperature of three separate remote thermal zones (Figure 1). Multiplexers have resistance, RON, associated with them; the channel matching and flatness of this resistance normally result in a varying temperature offset....

Temperature Monitor:  (electronic schematic / circuit added 4/02)

Test batteries without a Voltmeter part 3:  03/15/01 EDN-Design Ideas / (added 11/05)

Test Batteries Without a Voltmeter:  11/09/00 EDN-Design Ideas  / (added 5/02) / PDF contains multiple circuits scroll to find the one of interest / This circuit an easy approach to testing batteries without exiting the voltmeter. The battery holders in sizes AAA, AA, C, and D make this tester so much faster than a voltmeter.

Test timer:  The output goes high for a fixed period of time when power to a unit under test (UUT) is turned on, and again when it is turned off. It was used with a magnetic sensor to test the spin-up and spin-down time of a gyroscope.  Designed by Andrew R. Morris  (added 6/06)

Test Video A/D Converters Under Dynamic Conditions:  AN-297-Analog Device Application Notes  (app note added 6/06) 

Tester Checks Christmas-Tree Lights:  12/23/99 EDN-Design Ideas / (added 3/03)

Testing and Troubleshooting Digital RF Communications Receiver Designs:  Aligent Application Note  (added 2/06)

Testing CDMA Base Station Amplifiers:  Aligent Application Note  (added 2/06)

Testing inductors at application frequencies:  Coilcraft RF Magnetics Application Notes -(added 6/06)

Testing Linearity of the LTC2400 24-Bit No Latency Delta SigmaTM A/D Converter Help from the Nineteenth Century:  Design Solutions 11  Design Notes (Linear Technology)  (app note added 2/06)

Thermal Techniques in Measurement and Control Circuitry:  AN5 Linear Technology 6 applications utilizing thermally based circuits are detailed. Included are a 50MHz RMS to DC converter, and anemometer, a liquid flow meter and others. A general discussion of thermodynamic considerations involved in circuitry is also presented.

Three Level Audio Power Indicator:  Battery-operated Three LED display that connect it to loudspeaker output   (added 5/02)

Time Domain Reflectometer:  (circuit / schematic added 2/03)

Tiny twisted-pair transmission line solves test-fixture woes:  12/16/05  EDN Design Ideas  /  (added 10/06)  Commonly available wire fits in tight spots.