op amp circuits
#op-amp
#amplifier
#analog
#signal processing
#feedback
#inverting amplifier
#non-inverting amplifier
#differential amplifier
#integrator
#differentiator
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op amp Detect real overcurrent/short-circuits vs. current peaks
A MOSFET is employed to drive a load that includes a sense resistor in its current path. The voltage across this resistor is utilized to trigger a circuit capable of disconnecting the load in the event of an overcurrent condition....
Car Antenna Amplifier Circuit
The total gain of the car antenna amplifier is approximately 30 dB, with an input impedance of around 10 kΩ at 30 MHz. The amplifier should be mounted directly at the base of the antenna to prevent signal losses attributed...
Voltage-freezer
This circuit reads and stores voltages, thereby freezing the meter reading even after the probes are removed. The operational amplifier (op-amp) is configured as a unity-gain voltage follower, with capacitor C1 located at the input to store the voltage. For...
Hands-off-intercom
Amplifier A increases the microphone's output to a usable level. The output signal is fed to op amp B, which inverts the signal by 180 degrees. A balance-control potentiometer connects across the outputs of amplifiers A and B. If an...
Glitch-Free Clipper
A simple clamping circuit can be added to a Harris 2620 high-speed operational amplifier (op-amp) to create a glitch-free amplifier and clipper. The pin that controls the device's bandwidth is a high-impedance, isolated input, which also tracks the output voltage...
Linear-ic-siren
A low-frequency op-amp oscillator and a voltage-controlled oscillator (VCO), both configured using a single MC3405 dual op-amp and dual comparator, are the primary components in a siren circuit capable of producing various warbles and wails, or functioning as an audio...
Robots Bandpass Filter Calculator
These are operational amplifier (op-amp) based filters that are particularly effective within the audio frequency range. The calculators for these filters utilize formulas and tables from the book "Electronic Filter Design Handbook" by Arthur B. Williams. Bandpass filters allow a...
Refrigerator Pig
Upon opening your fridge door the photocell is exposed to light and the piggy oinks. Reverse engineered circuit diagram is of an early commercial design which uses an OP-AMP to make simulated pig sounds. Modern Fridge Pigs sound much better...
Amplifier Timer Circuit Schematic
This circuit deactivates an amplifier or any connected device when a low-level audio signal is absent at its input for at least 15 minutes. Activating switch P1 powers the device, enabling operation of any appliance connected to SK1. The input...