Amplifier Circuit

PRECISION_PHOTODIODE_COMPARATOR

Published:2009/6/25 2:28:00 Author:May

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22_WATT_INCANDESCENT_LAMP_DRIVER

Published:2009/6/25 2:18:00 Author:May

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BUTLER_EMITTER_FOLLOWER_OSCILLATOR（100_MHz）

Published:2009/6/25 2:13:00 Author:May

Circuit NotesThis circuit has good performance without any parasitics because emitter follower amplifier has a gain of only one with built-in negative feedback to stabilize its gain.   (View)

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NEON_LAMP_DRIVER

Published:2009/6/25 2:09:00 Author:May

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LIMIT_COMPARATOR_1

Published:2009/6/25 1:51:00 Author:May

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COMPARATOR_CLOCK_CIRCUIT

Published:2009/6/25 1:50:00 Author:May

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DOUBLE_ENDED_LIMIT_COMPARATOR

Published:2009/6/25 1:49:00 Author:May

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LIMIT_COMPARATOR

Published:2009/6/25 1:49:00 Author:May

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OPPOSITE_POLARITY_INPUT_VOLTAGE_COMPARATOR

Published:2009/6/25 1:48:00 Author:May

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WINDOW_COMPARATOR_1

Published:2009/6/25 1:44:00 Author:May

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INVERTING_COMPARATOR_WITH_HYSTERESIS

Published:2009/6/25 1:43:00 Author:May

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NONINVERTING_COMPARATOR_WITH_HYSTERESIS

Published:2009/6/25 1:42:00 Author:May

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COMPARATOR_WITH_TIME_OUT

Published:2009/6/25 1:42:00 Author:May

The MC1422 is used as a comparator with the capability of a timing output pulse when the inverting input (Pin 6) is ≥the noninverting input (Pin 5). The frequency of the pulses for the values of R2 and C1 as shown is approxi-mately 2.0 Hz, and the pulse width 0.3 ms.   (View)

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WINDOW_COMPARATOR_DRIVING_HIGH_LOW_LAMPS

Published:2009/6/25 1:40:00 Author:May

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WINDOW_COMPARATOR

Published:2009/6/25 1:39:00 Author:May

This circuit gives an output (which in this case is 0V) when an input voltage lies in be-tween two specified voltages. When it is out-side this window, the output is positive. The two op amps are used as voltage comparators. When Vin is more positive than Vref (upper) the output of IC1 is positive and Dl is forward biased. Otherwise the output is negative, D1 reverse biased and hence Vout is 0V. Similarly, when Vin is more negative than Vref (lower), the output of IC2 is positive; D2 is forward biased and this Vout is positive. Otherwise Vout is 0V. When Vin lies within the window set by the reference voltages, Vout is 0V.   (View)

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DUAL_LIMIT_COMPARATOR

Published:2009/6/25 1:37:00 Author:May

This circuit gives a positive output when the input voltage exceeds 8.5 volts. Between these limits the output is negative. The posi-tive limit point is determined by the ratio of R1, R2, and the negative point by R1, R3. The forward voltage drop across the diodes must be allowed for. The output may be inverted by reversing the inputs to the op amp. The 709 is used without frequency compensation.   (View)

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DIODE_FEEDBACK_COMPARATOR

Published:2009/6/25 1:34:00 Author:May

This circuit can drive an LED display with constant current independently of wide power supply voltage changes. It can operate with a power supply range of at least 4V to 30V. With 10M resistances for R2 and R3 and the inverting input of the comparator grounded, the cir-cuit becomes an LED driver with very high input impedance. The circuit can also be used in many other applications where a controllable constant current source is needed.   (View)

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COMPARATOR_WITH_VARIABLE_HYSTERESIS_WITHOUT_SHIFTING_INITIAL_TRIP_POINT

Published:2009/6/25 1:34:00 Author:May

An operational amplifier can be used as a convenient device for analog comparator appli-cations that require two different trip points. The addition of a positive-feedback network introduces a precise variable hysteresis into the usual comparator switching action. Such feedback develops two comparator trip points centered about the initial trip point or refer-ence point. The voltage difference, AY, be-tween the trip points can be adjusted by varying resistor R2. When the output voltage is taken from the zener diode, as shown, it switches between zero and Vz, the zener voltage.   (View)

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PIEZO_MICROPOSITIONER_DRIVER

Published:2009/6/24 23:43:00 Author:May

The PA41 from Apex Microtechnology is used here to drive a piezoelectric micropositioner. The drive voltage is less than 20 V p-p at input.   (View)

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PIEZO_DRIVER

Published:2009/6/24 23:42:00 Author:May

Using a PA41 from Apex Microtechnology, this monolithic amplifier is capable of 350-V operation and delivers 660 V p-p in a bridge circuit.   (View)

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