CMOS Based VCA
#CMOS
#VCA
#voltage controlled amplifier
#op-amp
#analog circuits
#signal processing
#amplifier
#audio processing
#electronic control
#voltage control
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Bootstrapped Amp Current Source
This circuit responds to the difference between Vj and V2. Rq sets the gain. Resistors XR2 and (1 - X) R2 produce the bootstrap effect. These two resistors convert the circuit's output voltage to a current. IC1 and IC2 are...
Single Input to Differential Input Adapter for Digital Voltmeter
In some cases, a differential input is needed for voltage measurement. By using a single operational amplifier, it is possible to construct an adapter that provides a floating voltage reference.
To achieve a differential input for voltage measurement using an operational...
Night security light
This simple circuit is built around a CMOS IC 4060 to obtain the required timing. During daytime, the LDR has low resistance and keeps pin 12 of IC1 high, preventing IC1 from oscillating. When it is dark, the LDR resistance...
Voltage Controlled Switch
This is a small circuit designed for use as a charging controller or voltage limiter. It is particularly useful for creating a solar charger. The assembly of the circuit allows for modifications according to personal preferences. The circuit is intended...
Multiple-feedback bandpass filter
The operational amplifier (op amp) is configured in inverting mode. Resistor R3 connects the output to the inverting input, establishing the gain and the current through the frequency-determining capacitor, C1. Capacitor C2 provides feedback from the output to the junction...
Square Wave Generator using Op-Amp
Non-sinusoidal waveform generators are also referred to as relaxation oscillators. The op-amp relaxation oscillator depicted in the figure functions as a square wave generator. Generally, square waves are relatively simple to generate. Similar to the UJT relaxation oscillator, the frequency...
op amp Find Vo in an op-amp transistor circuit
The voltage measured at 12V after the emitter is perplexing, especially when the output from the op-amp is +15V, suggesting a 3V drop across the transistor. This raises questions about the expected gain of 2, which would imply an output...
Power Supply For Amplifiers
For the 60W amplifier, a nominal (full load) supply of +/- 35V is required, so a 25-0-25 secondary is ideal - however, see Updates, below. The circuit for the supply is shown below, and uses separate rectifiers, capacitors and fuses...
OpAmp based Voltage Translator Ciruit for ADC of Micro-controller
All naturally occurring phenomena such as sound, temperature, and pressure are analog in nature. To enable a microcontroller to read analog signals for the analog-to-digital conversion process using a built-in analog-to-digital converter (ADC), it is essential to condition the analog...