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Agc-with-squelch-control – Circuit Schematic
Agc-with-squelch-control
Automatic gain control is a very useful feature in a number of audio amplifier circuits: tape recorders, telephone speaker phones, communication systems and PA...
Voltage-controlled-attenuator – Circuit Schematic
Voltage-controlled-attenuator
This typical circuit uses an external op amp for better perlormance and an exponential converter to get a control characteristic of -6 dB IV. Trim networks are...
Programmable-attenuator – Circuit Schematic
Programmable-attenuator
This circuit performs the function of dividing the input signal by a selected constant (1, 2, 4, 8, etc.). While T, Z, or L sections could be used in the input...
Photodiode-amplifier – Circuit Schematic
Photodiode-amplifier
Adding two passive components to a standard photodiode amplifier reduces noise. Without the modification, the shunt capacitance of the photodiode reacting with ...
Summing-amplifier – Circuit Schematic
Summing-amplifier
This circuit uses a CA3193 BiMOS op amp. Because input noise of the amplifier is increased by Rp/ Rl//R2/ /R3, and the gain that a single input will amplify is...
Active-limiting-amplifier – Circuit Schematic
Active-limiting-amplifier
The modified inverting amplifier uses an active clamp to limit the output swing with precision. Allowance must be made for the V8E of the transistors. The sw...
Differential-amplifier – Circuit Schematic
Differential-amplifier
This differential amplifier uses a CA3193 BiMOS op amp. This classical, differential input-tosignal- ended output converter when used with lowresistance signal ...
Composite-amplifier – Circuit Schematic
Composite-amplifier
A composite configuration greatly reduces de errors without compromising the high-speed, wideband characteristics of HA-2539. The HA-2540 could also be used, b...
15V-chopper-amplifier – Circuit Schematic
15V-chopper-amplifier
This simple circuit is a gain-of-1000 inverting amplifier. It will amplify submillivolt signals up to signal levels suitable for further processing. In almos...
Safe-opamp-circuit – Circuit Schematic
Safe-opamp-circuit
In intrinsically safe applications, it is sometimes necessary to separate sections of circuitry by resistors which limit current under fault conditions. The ci...
Norton-amplifier – Circuit Schematic
Norton-amplifier
The noninverting amplifier has a gain of R2/R3 (1 in this case) and produces a voltage of V,"" during a positive excursion of Vin with respect to ground. The...
Buffer-amplifier-for-multiplexers – Circuit Schematic
Buffer-amplifier-for-multiplexers
The precision input characteristics of the HA-5147 help simplify system error budgets, while its speed and drive capabilities provide fast charging of the mult...
Zero crossing detector – Circuit Schematic
Zero crossing detector
This detector is useful in sine wave squaring circuits and A/D converters. The positive input may either be grounded or con-output nected a nulling voltage whic...
Schmitt trigger – Circuit Schematic
Schmitt trigger
The lower trigger point is fixed at % Vcc, but the upper trigger point is adjustable by means of Pin 5 from Vi Vcc to slightly less than Vcc...
Schmitt trigger zero crossing detector – Circuit Schematic
Schmitt trigger zero crossing detector
This circuit has a 100 mV hysteresis which can be used in applications where very fast transition times are required at the output even though the signal is ver...
Schmitt trigger with programmable hysteresis – Circuit Schematic
Schmitt trigger with programmable hysteresis
CA 3088 is used as a versatile Schmitt trigger. The size of the hysteresis levels is determined by Ia that flows out of the amplifier"s output and through R2. I...
Schmitt trigger – Circuit Schematic
Schmitt trigger
By replacing the common-emitter resistor in a conventional Schmitt by a zener diode...
Sample and hold – Circuit Schematic
Sample and hold
The 2N4393 JFET was selected because of its low less (< 100 pA), very low ID (< 100 pA) and low pinchoff voltage...
High speed sample and hold – Circuit Schematic
High speed sample and hold
This circuit exhibits a 10 V acquisition time of 900 ns to 0% accuracy and a droop rate of only 100 µ-V/ms at 25° C ambient condition. An even faster acqu...
Sample and hold – Circuit Schematic
Sample and hold
The JFETs, Ql and Q2, provide complete buffering to Cl, the sample and hold capacitor. During sample, Ql is turned on and provides a path, rds(on), for charging...