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This is a preamplifier circuit. 

You need to connect it to amplifier to hear large sound, otherwise you can hear sound by headphone or earpiece.


This electronic learning kit is designed for youngsters ,amplifier lovers, students and hobbyists to learn fundamental concepts and practice skills such as 

component identification, soldering, and testing. Before diving into programmable electronics such as Arduinos, this circuit is highly 

recommended for anybody interested in electronics.

You'll need a 12VDC battery or power supply. This package not included the power supply. 

The presence of an adult is required at all times.

STEPS:

1. Solder the components to the PCB Board.

2. Connect the J points by wire.

3. After soldering the components to the PCB board, connect the 12VDC power supply. 

4. Remember to input power by DC12V power source. Circuit not include AC to DC convert rectifier section.

5. Connect the Audio input and output lines.

6. Adjust the repeating time and delay by controllers.

7. Use an enclosure or casing for beautiful finish.

8. Please feel free to massage us for any technical support.



Description

Operating voltage: 12V DC

Size of PCB: 78mm*44mm

Use the 1.6MM thick double-sided Fiber Glass Board.

Package Contents: PCB Board and components.

The PT2399 is an Echo Processor IC that is commonly used to provide digital delay in audio circuits. The IC takes in analog audio input and converts it into digital stream of bits to add a digital delay to it. This audio delayed audio signal is then provided as output.

 

PT2399 Pinout Configuration

Pin Number

Pin Name

Description

1

VCC

Supply Voltage Input

2

REF

Analog Reference Voltage Input

3,4

AGND, DGND

Analog Ground and Digital Ground

5

CLK_O

Clock Signal Output

6

VCO

Frequency adjust input pin

7,8

CC1,CC0

Current control 1 and Current control 0

9,10

OP1-OUT,OP1-IN

1st Op-amp Output and input pin

11,12

OP2-IN,OP2-OUT

2nd Op-amp Input and Output pin

13,14

LPF2-IN,LPF2-OUT

2nd Low pass filter input and output pin

15,16

LPF1-OUT,LPF-IN

1st Low pass filter output and input pin

 

Features

  • Audio Echo Processor for digital delay 
  • Supply Voltage: 4.5V to 5.5V
  • Clock Frequency: 4MHz
  • Maximum Voltage gain: 2.5dB
  • Power Supply Rejection Ratio: -40dB (typically) 
  • Available in 16-pin PDIP, GDIP, PDSO packages

Introduction to PT2399

The PT2399 is an age old Echo Processor IC from a manufacturer called Princeton. The IC has been extensively used in audio application to create digital delays and other modulations. It can commonly be found in Karaoke mixers and other toys requiring audio modulations. A sample application circuit for the IC is shown below from the datasheet.

PT2399 Circuit

The IC is originally from Taiwan (China) and hence most of the passive components (mainly capacitors) used in the application circuit will not available globally. But since the values are not operation sensitive you can try using a close value as possible. The IC works with CMOS technology and claims to have a very low distortion value of less than 0.5%. But still many designers have reported a mild fizzing noise during operation. Irrespective of the drawbacks the IC is still widely used in audio consoles for echo purposes. More details can be found at the datasheet.

 

Application

  • Audio processing application
  • Echo creator
  • Karaoke Mixer
  • Entertainment/Infotainment system
  • Electronics toys

 

2D Model and Dimensions

PT2399 Dimensions

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