10/27/94 EDN-Design Ideas
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11/06/97 EDN-Design Ideas
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12/12/97 EDN-Design Ideas /
temperature-controlled PWM boost converter allows
operation of a12V brushless dc fan from a5V
supply : 03/21/2002
EDN - Design Ideas / 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. |
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Auto-Fan, automatic temperature
control: |
BangBang Heater:
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BangBang Thermostat is Simple &
Efficient: 11/06/97
EDN-Design Ideas |
Boost Converter Controls 12 Volt
Fan From 5 Volt Supply:
12/12/97 EDN-Design Ideas /
Temperature-controlled PWM boost converter
allows operation of a12V brushless dc fan from
a5V supply |
Circuit Enables Precision Control
In Radiant Heating Systems:
01/08/01 Electronic Design - Ideas for Design /
Successful design of precision
temperature-control loops, like all
high-performance servo systems, depends on
careful management of the usual feedback gain
and bandwidth tradeoffs. While always tricky,
these interactions can become unmanageable if
the. . . |
Circuit improves on temperature
measurement:
05/02/2002 EDN - Design Ideas / 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: |
Controller Provides Closed Loop
Temperature Regulation:
05/08/97 EDN-Design Ideas |
Electronic Thermostat:
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Electronic Thermostat Relay
Circuit: |
Heating System Thermostat:
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LM3911 Temperature Controller: |
Peltier Element Controls itself:
10/27/94 EDN-Design Ideas |
Speed Control Handles Isolated
–48 Volt Fans :
08/05/02 Electronic Design - Ideas for Design /
Chips are available to monitor and control
ventilation fans. But less common are fan
controllers for telecom applications. Such fans
must operate in electrically isolated
environments with a supply voltage in the 36- to
72-V range. For example, the... |
Take Back Half: A Novel
Integrating Temperature-Control Algorithm:
12/04/00 Electronic Design - Ideas for Design /
According to Linear Technology’s Jim Williams,
“The unfortunate relationship between servo
systems and oscillators is very apparent in
thermal control systems.” (Linear Applications
Handbook, 1990). High-performance temperature
control is. . . |
Temperature Controlled Based on
AT89CX051: |
Temperature Controlled NiCd
Charger: |
Temperature Controlled Ovens:
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Temperature Controller:
Remote sensor sends data via mains supply
Temperature range:00.0 to 99.9 �C |
Temperature controller
: |
Temperature Controller keeps IR
Detector At 8�K:
01/07/99 EDN-Design Ideas / PDF contains
multiple circuits - scroll to find this circuit.
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Temperature Monitor:
) |
Temperature Programmer uses
Digital Control:
07/18/96 EDN-Design Ideas |
Temperature Regulator #2: |
Temperature Sensitive Oscillator:
Temperature controlled based on AT89CX051
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Thermo Cooling Fan:
fan controller, which controls fan based on
temperature |
Thermoelectric Controller
(scriptable Thermometer): |