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op amp Why do some of my IE converter circuits have a large offset voltage
The inverting input is maintained at a low level via a 10K resistor when the circuit is powered on but not in use. During measurement activities, including calibration measurements where the input is floating, this resistor is disconnected. The circuit...
Op-Amp Pulse Generator Circuits
Several operational amplifier circuits are presented here, configured as square wave oscillators. A square wave is a periodic pulse train with a 50 percent duty cycle. The operational amplifier functions as a high-gain amplifier, and oscillation is achieved with minimal...
Single Op-Amp Tone Control
This is a single operational amplifier tone control circuit. The circuit functions as a hybrid low-pass, high-pass, and one-pole filter with both attenuation and gain.
The single op-amp tone control circuit utilizes an operational amplifier (op-amp) to manipulate audio signals by...
High Impedance DC Voltmeter Circuit Using Op Amp
This design outlines a high impedance DC voltmeter circuit utilizing the uA741 integrated circuit (IC). The uA741 is configured as a non-inverting DC amplifier. The circuit incorporates negative feedback through a DC meter that requires 1 mA for full-scale deflection....
Op-Amp Application: Level Shifting Amplifier
In linear equipment design, it is sometimes necessary to take a voltage that is referenced to a certain DC level and generate an amplified output that is also referenced.
In linear circuit design, the process of amplifying a voltage that is...
Guitar Control
The IC1A operational amplifier is configured as an inverting amplifier, with its gain determined by a three-way switch that connects different resistor values in parallel to R4. Following this input stage is an active three-band tone control circuit, designed to...
The frequency shift demodulator circuit composed of active filter
Replacing the LC modulation circuit with an active filter allows for the elimination of large and costly inductance coils in frequency shift key control demodulators. This approach not only reduces the size of the circuit but also enhances the performance...
Adjustable oscillator
This circuit features two feedback paths around an operational amplifier (op-amp). One feedback path is a positive DC feedback that creates a Schmitt trigger, while the other incorporates a capacitor-resistor (CR) timing network. When the output voltage is +10 V,...
Polarity Gain Adjustment Circuit
By adjusting one potentiometer, the output of this circuit can be varied from a positive version of the input signal, smoothly transitioning through zero output, and then to a negative version of the input. For instance, if the input signal...