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Microphone Preamp/Reverb - PT2399/LMV358

Overview

Microphone Preamp/Reverb - PT2399/LMV358
1. Introduction
The PT2399 is a CMOS-based echo audio processor IC that uses a DAC, high sampling frequency, and 44K memory for digital processing to generate audio. Regarding delay time, it also incorporates a voltage-controlled oscillator circuit internally, allowing the system clock to reach a readily adjustable frequency.
The LMV358 is a low-voltage, low-noise, low-power operational amplifier.

A switch here allows selection between direct op-amp output and reverb output.

This resistor adjusts the gain.

PT2399 Internal Block Diagram:

Reverb parameters can be adjusted via the resistor:

Resistor adjustment position is as follows:

This is an adjustable potentiometer in the standard circuit; it can be replaced with a potentiometer to achieve satisfactory results.

Datasheet:
https://html.alldatasheet.com/html-pdf/35152/PTC/PT2399/45/1/PT2399.html
Demo

Design Files

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Update:2026-03-27 18:58:28

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