|
Circuit generates Fan speed Control: 03/21/02 EDN Design Ideas /
(added 10/03) Fan noise is becoming a significant issue as
electronic equipment increasingly enters the office and the home. Noise is
proportional to fan speed, and the airflow hence, fan speed necessary for cooling is
less at low ambient temperatures. Because ambient temperature is lower than the upper
design point most of the time, a fan can run slower, making it easier on the ears. |
|
Circuit improves on temperature measurement: 05/02/02 EDN Design Ideas
/ (added 10/03) When current pulses with a stable IHIGH/ILOW ratio
modulate a semiconductor junction, the ensuing voltage difference (for example, ΔVBE
for a bipolar transistor) is a linear function of the absolute (Kelvin) temperature,
T. You can use this truism to make accurate temperature measurements. Technical
literature has thoroughly covered the relationship (references 1 to 4) and has numerou.... |
|
Constant Temperature Circuit: (electronic schematic / circuit added 4/02) |
|
Controller Provides Closed Loop Temperature Regulation: 05/08/97 EDN-Design
Ideas / (added 3/03) |
|
Current and temperature ratings: Coilcraft Power Magnetics Application Note
(app note added 6/06) |
|
Digital Remote Thermometer: Remote sensor sends data via mains supply
Temperature range:00.0 to 99.9 °C (added 9/04) |
|
Electronic Thermostat Relay Circuit: (electronic schematic / circuit added
4/02) |
|
Eliminate thermoelectric EMF in Low ohm measurements: 06/13/02 EDN Design
Ideas / (added 1/05) When two different-metal conductors connect
together in a loop and one of the junctions is at a higher temperature than the other,
an electrical current flows through the loop. The magnitude of this current depends on
the type of metals involved and the temperature differential of the junctions. When
you open such a loop, a thermoelectric voltage appears across the open ends.... |
|
Embedding Temperature Information in the ADXL202's PWM Outputs: AN-600
Analog Devices Application Notes (app note added 6/06) |
|
Fan Controller Adapts to System Temperature: 09/25/97 EDN-Design Ideas /
(added 2/03) Any piece of electronic equipment--whether it be a lab instrument, an
audio amplifier, or a PC--that relies on a cooling fan to control internal temperature
is a potential source of noise pollution or even hearing damage. Most of the time, the
fan's noise level is probably much higher than necessary, because it has enough
capacity to move enough air to handle worst-case conditions. In many systems, the fan
can either be off or running slowly most of the time with no damage to the system.
Keeping the fan off or running slowly benefits you by reducing ambient noise and
possible fatigue, irritated nerves, or even hearing damage. The circuit in Figure 1
adjusts a fan's speed according to temperature.... |
|
Ground Rules for High Speed Circuits: AN-214 Analog Devices Application Note
(app note added 6/06) Layout and Wiring Are Critical in Video Converter
Circuits. |
|
Grounding for Low-and-High-Frequency Circuits: AN-345 Analog Devices
Application Note (app note added 6/06) Know Your Ground and
Signal Paths for Effective Designs. Current Flow Seeks Path of Least Impedance-Not
Just Resistance.... |
|
Heating System Thermostat: (circuit added 9/04) |
|
HFAN-08.2.0: Thermoelectric Cooler (TEC) Control: App Note 3318: Maxim IC
(application note added2/06) |
|
Improving Temperature, Stability, and Linearity of High Dynamic Range RMS RF Power
Detectors: AN-653 Analog Devices Application Note (app note
added 6/06) |
|
Isolation Techniques for Signal Conditioning: National Semiconductor
Application Note (app note added 2/06) |
|
Keys to Longer Life for CMOS: AN-349 Analog Devices Application Note
(app note added 6/06) Here's How CMOS Can be Protected Against Abuse |
