Powerline Carrier System Transmitter for Audio (Music/Speech)

Power line carrier system is common in home appliances networking. One benefit of using this kind of transmission line is that we don’t have to deal with additional wiring for data or signal communication, since all we need is already provided when we plug the power jack into the power outlet/stop contact. The circuit depicted in the schematic diagram below […]

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Digitally Controlled Gate for Audio Signals

This circuit can be applied in digital-controlled audio application, for example to select the active input line by a micro controller. For such purpose, we can build three units of this circuit and feed their outputs into a three channel simple audio mixer  circuit, and now the selection of the active channel can be done by a micro controller. For […]

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PC (Audio) Signal Generator Using RS232 Port

Using an RS232 port, we can generate square wave oscillation when transmitting data, and this can be “misused” as signal generator (square wave generator). This is a PC Signal generator produce a square wave in audible frequency range. This circuit utilize a transmission of a “U” character from ASCII character set. This character has binary value of 01010101, making it […]

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Tremolo Effect Circuit for Electric Guitar or Other Musical Instruments

Tremolo circuit is a kind of sound effect. We can see this type of effect is applied  in guitar effect pedals.  Tremolo effect is produced if we modulate the amplitude of an audio signal. The shape of modulating signal can vary from square wave, sawtooth, or sine. When we use a square wave, then the effect produce a knocking-like sound […]

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Voltage Controlled Variable Gain Video Amplifier

For you those are not familiar with analog circuits, it might seem difficult to find a practical  application of analog video amplifier circuit. In today’s electronics, you might be wonder how such circuit can be useful in this digital domination era. You can see almost all of new devices provide digital interface for video, even a low cost Raspberry Pi […]

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5 A Constant Voltage-Constant Current Regulator

A constant voltage constant current  (CVCS) regulator  doesn’t mean a system with a constant load, since there will be no regulation in such case.  What we call CVCS regulator is a regulator with two modes. The first mode is constant voltage, where the regulator trying to regulate the supply to a variable load at a constant voltage. In this mode […]

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