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Bridge Circuit With One Power Supply – Circuit Schematic
Bridge Circuit With One Power Supply
For systems with only one power supply, two op amps act as instrumentation and buffer amps. The OPA111...
Low-Battery Indicator – Circuit Schematic
Low-Battery Indicator
The sensing circuit consists of a 741 op amp set up as a voltage comparator, using a zener diode as a voltage referen...
Window-detector – Circuit Schematic
Window-detector
This novel window detector uses only two op amps. ...
Window-detector – Circuit Schematic
Window-detector
This circuit de-energizes a normally energized relay if the input voltage goes above or below two individually set voltages. The transistor driving the relay i...
Bipolar-reference-source – Circuit Schematic
Bipolar-reference-source
This current source has continuous control of the magnitude and polarity of its amplifier gain and needs only one voltage reference. The circuit includes refer...
Voltage-freezer – Circuit Schematic
Voltage-freezer
This circuit reads and stores voltages, tbus freezing the meter reading even after tbe probes are removed. The op amp is configured as a unitygain voltage fo...
Voltage-to-frequency-converter – Circuit Schematic
Voltage-to-frequency-converter
This circuit can accept positive or negative or differential control voltages. The output frequency is zero when the control voltage is zero. The 741 op amp fo...
Voltage-to-frequency-converter – Circuit Schematic
Voltage-to-frequency-converter
The input voltage, V1, causes C1 to charge and produce a ramp voltage at the output of the 741 op amp. Diodes D1 and D2 are four-layer devices. When the voltag...
Wide-range-voltage-to-frequency-converter – Circuit Schematic
Wide-range-voltage-to-frequency-converter
This circuit uses a programmable op amp such as the -HA2730-a two-amplifier monolithic chip with independent programming ports for each amplifier-whose slew ra...
Video-signal-clamp – Circuit Schematic
Video-signal-clamp
The circuit uses a track-and-hold amplifier in a closed-loop configuration to clamp the back-porch voltage of a standard video waveform to 0 V. The circuit"s o...
Color-video-amplifier – Circuit Schematic
Color-video-amplifier
The NE5539 wideband op amp is easily adapted for use as a color video amplifier. The gain varies less than 0.5% Irom the bottom to the top of the staitVlse. Th...
Summing-amplifier-clamping-circuit – Circuit Schematic
Summing-amplifier-clamping-circuit
This circuit is a traditional summing amplifier configuration with the addition of the de clamping circuit. The operation is quite simple; each component-synch...
Photodiode-amplifier – Circuit Schematic
Photodiode-amplifier
This circuit uses a CA5422 dual BiMOS microprocessor op amp. The bootstrap amplifiers minimize bias currents while maintaining electrostatic discharge protecti...
Differential-to-single-ended-voltage-amplifier – Circuit Schematic
Differential-to-single-ended-voltage-amplifier
This circuit uses a CA5470 quad microprocessor BiMOS-E op amp. Amplifiers Al and A2 are employed as a cross-coupled differential input and differential output ...
Signal-track-and-hold – Circuit Schematic
Signal-track-and-hold
When the switch is closed or the FET is conducting, the circuit behaves as an inverting amplifier with a gain of R2/Rl. Since as the inverting tenninal of the ...
Positive-and-negative-voltage-reference-tracker – Circuit Schematic
Positive-and-negative-voltage-reference-tracker
This reference uses an op amp to derive a negative output voltage that tracks with the positive reference voltage. ...
Track-and-hold – Circuit Schematic
Track-and-hold
The 5-MHz track and hold shown here has a 400-kHz power bandwidth driving ±10 V. A buffered input follower drives the hold capacitor, C4, through Ql, a low ...
Linear-ic-siren – Circuit Schematic
Linear-ic-siren
A low-frequency, op-amp oscillator and a VCO, both configured from a single MC3405 ~dual op amp and dual comparator, are tbe major components in a siren circ...
Sample-and-hold – Circuit Schematic
Sample-and-hold
This circuit uses a CA3140 BiMOS op amp as the readout amplifier for the storage capacitor Cl, and a CA3080A variable op amp as input buffer amplifier and low ...
Inverting-sample-and-hold – Circuit Schematic
Inverting-sample-and-hold
This illustrates another application in which the hookup versatility of a sample-and-hold often elimi nates the need for a separate op amp and a sampleand- hol...