Line Preamplifier Circuit with Tube Acquisition

The circuit was designed to create a line preamplifier by acquiring the use of double triode tubes. The circuit comprises of three parts, the main preamplifier circuit with tubes, the input selector and delay module, and the power supply module.

Electronic Crossover with 3-Way Output

The circuit was designed to create a classic electronic crossover circuit that will provide a 3-way output on all loudspeakers.

Protection Circuit for Power Amplifier Output and Loudspeaker

The circuit was designed to provide protection to the output of power amplifier thereby protecting the loudspeaker from unwanted noise and other elements.

Digital Volume Controlled Audio Preamplifier

The circuit was designed to build a volume control  that is operated digitally on an audio preamplifier circuit.

Volume Unit Measurement with LM3915 and LM3916

The circuit was designed by two monolithic integrated circuits to measure the level of audio signals whose unit of measurement is known as volume unit.

Audio Signal Peak Indicator

The circuit has been designed to indicate the peak reading of audio signal as well as the audio overload indication.