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Combination Tachometer, Thermometer, and Counter - Inspired by the need to measure
dc motor speed and detect overheating, this 68HC908KX8 microcontroller-based circuit
displays various statistics on six-digit, eight-segment, numeric LEDs. See movies of a
thermistor in action as well as a reflective or interrupt-based photosensor counting.
(project added 10/06) |
Computer Fan Speed Tacho Out Circuit: Add a Fan Speed Monitor Lead to Any 12V Two Wire
Fan. - You will find this identical circuit inside most 3 wire computer fans with
speed monitoring output to the motherboard.
Peel off the sticker from the fan hub in order to access a motor winding pin for
connecting up the tacho circuit. (added 2/05) |
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Digital Engine/Race Computer Board - The objective of this project is to design a
high speed digital engine tachometer. This requires the design and development of a
hardware and software solution to monitor the status of an engine in real time. In
addition, information relating to the overall health and systems of the vehicle can be
displayed. (added 10/05) |
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Digital Tachometer Avoids Analog Vices - 11/10/94 EDN-Design Ideas: The
digital tachometer in Fig 1a is a component of the digital seek servo loop in Fig 1b.
The loop produces an error signal that causes a motor to follow a sophisticated
velocity profile (Fig 2). Although you could use an analog tachometer, the digital one
costs less, performs better, is less sensitive to temperature, and implements easier
in a custom IC.....(design idea added 3/03) |
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Engine/Race Computer Board - The objective of this project is to design a high
speed digital engine tachometer. This requires the design and development of a
hardware and software solution to monitor the status of an engine in real time. In
addition, information relating to the overall health and systems of the vehicle can be
displayed. (added 10/05) |
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LM2907 Tachometer/Speed Switch Building Block Applications - National
Semiconductor Application Note (app note added 2/06) |
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Optical Tachometer Provides BiDirectional Info - 05/21/98 EDN-Design Ideas:
(design idea added 6/06) |
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Simple Circuit Measures Diesel's Rotations Per Minute - 03/04/99 EDN-Design Ideas:
You may find it useful to measure a diesel engine's rotations per minute to accurately
adjust the idling or to compare the motor's speed under hot and cold conditions, for
example. Not all cars or trucks come with a tachometer. The scheme in Figures 1 and 2
allows you to measure.....(design idea added 8/03) |
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Speed Limit Alarm - (circuit added 9/04) |
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Speed Measurement and Control with the AD2S83, Silicon Tachogenerator - AN-236
Analog Devices Application Notes (app note added 6/06) |
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Tachometer Avoids Analog Vices - 11/10/94 EDN-Design Ideas: The tachometer
in Fig 1a is a component of the seek servo loop in Fig 1b. The loop produces an error
signal that causes a motor to follow a sophisticated velocity profile (Fig 2).
Although you could use an analog tachometer, the one costs less, performs better, is
less sensitive to temperature, and implements easier in a custom IC.....(design idea
added 3/03) |
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Tachometer Circuit - A simple tachometer circuit using one NPN transistor.
(12/04/2007) |
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Tachometer Demodulator has Fast Response Time - 12/07/95 EDN-Design Ideas:
When a tachometer is a critical part of overspeed-shutdown circuitry, the response
time of conventional demodulators may be too long. The circuit in the block diagram in
Figure 1 provides updated speed data. The circuit provides corrections for variations
in excitation amplitude and frequency.....(design idea added 3/03) |
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Tachometer for Bikes (circuit) - Here are some instructions how to connect the
Tachometer version II to a single cylinder. (design added 3/07) |
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Tachometer/RPM - Easy to build using only a few components. With some
modifications, it can be used in an automovil. This Tachometer uses a PIC
16F628.(design added 06/04) |
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Tachometer/RPM II - This is an improved version of the Tachometer created
specially to measure up to 9,999 RPM. Uses a PIC 16F628. (added schematic 04/06) |
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Wireless Auto Tachometer (Aaron Cake) - (electronic schematic / circuit added
04/03/02) |
