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Comparator Circuits
Page 5
Comparators:
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Last Updated on:
Friday, March 23, 2012 04:34 PM |
| Circuits
Designed by Dave Johnson, P.E. : |
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WIDE BAND ZERO CROSS DETECTOR
This circuit was designed to convert a low amplitude 40KHz signal into a clean
square wave signal. It will work with inputs as small as 5mv peak-to-peak or
as large as 3 volts peak to peak. The input frequency can range from a few
kilohertz to about 150KHz.
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XENON LAMP FLASH DETECTOR
This circuit uses a small 2.5mm square photo diode in conjunction with a 100mH coil
to detect the short light flashes from a xenon lamp. The coil makes the
circuit immune to normal room lights. Its 10mv sensitivity can detect light
flashes from a range of over 100 feet. Reflections from a room’s walls and
ceiling is usually enough to trigger the circuit. The entire circuit draws
only 3 Microamps from a 6 to 9 volt battery.
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
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Two Buttons Provide Safe Start - 07/06/00 EDN-Design Ideas The
circuit in Figure 1 provides a safety interlock that checks the actuation of two
pushbuttons before enabling a relay. When you push both buttons, the circuit
actuates the relay. At that point, you can release one of the switches without the
relay'.... [Design Idea by Vincent Himpe, Alcatel Microelectronics, Desselgem,
BelgiumVincent Himpe, Alcatel Microelectronics, Desselgem, Belgium] |
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UltraLow Power Comparators Include Reference - DN123 Design Notes
(Linear Technology) (app note added 1/06) |
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Voltage Comaparator and Q Multiplier make a stable Sine Wave Oscillator (in PDF
format) - It is a known fact that sinusoidal oscillators must rely on
the action of some amplitudelimiting mechanism in order to achieve good frequency
and amplitude stabilities. Likewise, accurate loop-gain control and high-Q
tuned circuits are required for the attainment of low-distortion output levels.
(designed by Ramon Vargas added 11/06) |
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Voltage Comparator - This page will provide some basic information about
voltage comparator integrated circuits and and to act as reference material for
other circuits. These circuits are based on the LM339 Quad Voltage Comparator
chip. [from Rob Paisley's Model Train web site] |
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Voltage Comparator - This experiment only requires a single operational
amplifier. The model 1458 and 353 are both "dual" op-amp units, with two complete
amplifier circuits housed in the same 8-pin DIP package. I recommend that…(circuit
added 6/07) [created by Tony R. Kuphaldt] |
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Voltage comparator forms pulse demodulator - 11/19/98 EDN-Design Ideas
To process low-level ultrasound or radio-range pulses, you need a
signal-conditioning amplifier followed by a pulse demodulator to translate the
signals to dc pulses. Traditionally, you would use a diode-demodulator
configuration (for example, the circuit in Figure 1a] with one stage of a
single-supply op amp....scroll to find this one.... [Design Idea by Abel Raynus,
Armatron International, Melrose, MA] |
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Voltage Comparator Switch - This circuit will provide an indication
whenever the input voltage differs from two defined limits, V1 and V2. The supply
voltage, Vcc must be higher than the highest input voltage by at least 2 volts.
One application here is to monitor a 12V car battery.... (schematic added 6/07)
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Voltage Comparator with Complementary Outputs - Circuit Ideas for
Designers Application Notes Advanced Linear Devices, Inc. (app note added
6/06) |
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Wide Band Zero Cross Detector - This circuit was designed to convert a
low amplitude 40KHz signal into a clean square wave signal. It will work
with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak.
The input frequency can range from a few kilohertz to about 150KHz. …. [Designed
by David A. Johnson] |
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Xenon Lamp Flash Detector - This circuit uses a small 2.5mm square photo
diode in conjunction with a 100mH coil to detect the short light flashes from a
xenon lamp. The coil makes the circuit immune to normal room lights.
Its 10mv sensitivity can detect light flashes from a range of over 100 feet.
Reflections from a room’s walls and ceiling is usually enough to trigger the
circuit. The entire circuit draws only 3 Microamps from a 6 to 9 volt
battery. …. [Designed by David A. Johnson] |
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Zero Crossing Detector - Circuit Ideas for Designers Application Notes
Advanced Linear Devices, Inc. (app note added 6/06) |
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18-bit ADC uses PC's serial port - 27-Sep-01 Issue of EDN A PC
usually requires a plug-in ADC card to process analog signals. However, with the
circuitry in Figure 1, a PC can communicate with an 18-bit ADC through its serial
port. The port provides both positive and negative power supplies as well as
control signals. IC1 is an 18-bit MAX132 ADC with a serial interface.... [Design
Idea by Yongping Xia, Teldata, Los Angeles, CA] |
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