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PT2399 Delay: Features, Datasheet, Application Circuit [Video&FAQ]

Author: Irene
Date: 13 Sep 2021
 79
PT2399 Echo-Reverb Circuit

Product Overview

The PT2399 is a CMOS echo/delay processor developed by Princeton Technology Corp. This digital chip includes an ADC (Analog to Digital converter), 44Kb of RAM to store the samples and a DAC (Digital to Analog converter). Although this chip was created as a simple solution to add delay/reverb/echo to karaokes and set-up entertainment systems, it became very popular in the guitar pedal community due to its ability to emulate BBD-based delay circuits, good price, through-hole package, 5V power supply and tolerance to modifications.

 

Video: PT2399 Echo-Reverb Circuit - SIDBoomBox Project 16 (Feat. Electronscape)

 

Catalog

Product Overview

PT2399 Features

PT2399 Applications

PT2399 Alternatives

Advantages of the PT2399

Disadvantages of the PT2399

PT2399 Pinout

PT2399 CAD Models

PT2399 Specification

PT2399 Application Circuit Schematic

PT2399 Block Diagram

PT2399 Manufacturer

PT2399 Datasheet

Using Warnings

PT2399 FAQ

 

PT2399 Features

  • CMOS Technology
  • Least External Components
  • Auto Reset Function
  • Low Noise, No< 90dBV Typical
  • Low Distortion, THD<0.5% Typical
  • External Adjustable VCO
  • Available in 16 pins, DIP or sO package

 

PT2399 Applications

  • Video Tape Recorder
  • Video Compact Disk
  • Television
  • CD Player
  • Car Stereo
  • KARAOKE Mixer
  • Electronic Musical Instrument
  • Audio Equipment with Echo Processor

 

PT2399 Alternatives

BU9253

 

Advantages of the PT2399

The first advantage of the PT2399 is its simplicity of use. Since it integrates many of the components we need, we can make a delay with only the chip and a few components ! Contrary to the BBD which needs a lot of external circuits.

 

The clock frequency is also much higher than the one used with a BBD. This results in less problems with aliasing and audible clock noise.

 

The second advantage of the PT2399 is the cost. Where a BBD costs from 3€ to more than 20€ for the famous MN3005, you can find a PT2399 between 1 and 2€. And since it already includes the clock and op-amps, the cost is even lower compared to a BBD circuit.

 

Disadvantages of the PT2399

The memory in the PT2399 is very limited, so the more you want long times, the less information the memory will be able to store. The sound quality will therefore be deteriorated over the long delays, causing like the BBD some noise problems.

 

Another problem is that the digital part cannot be accessed directly. You can’t add external memory to it to improve performance with long times.

 

Another example, the delay time is only controlled with the current on a pin. This is perfect to control the time with just one potentiometer connected to this pin. But it becomes more complicated if you want to precisely control the time with another external circuit, to add a tap tempo for example. Whereas with the BBD, you can generate the clock with any microcontroller.

 

PT2399 Pinout

These is pinout of PT2399,If you need more pinouts please download PT2399 datasheet.

 

PT2399 Pinout

PT2399 Pinout

 

PT2399 CAD Models

Followings are PT2399 Symbol, Footprint, and 3D Model.

 

PT2399 Symbol

PT2399 Symbol

 

PT2399 Footprint

PT2399 Footprint

 

PT2399 3D Model

PT2399 3D Model

 

PT2399 Specification

Product Attribute Attribute Value
Max Power Dissipation 1.7W
Max Supply Current 100mA
Max Supply Voltage 6.5V
Operation Temperature -40°C to +80°C
Package DIP-16
Recommended Clock Frequency 4-5MHz
Recommended Supply Voltage 4.5-5.5V
Storage Temperature -65°C to +150°C
Typical Max Output Voltage 1.25Vrms
Typical Output Distortion 0.004
Typical Output Noise Voltage -90dBV
Typical Power Supply Rejection Ratio -30dB
Typical Supply Current 15mA
Typical Supply Voltage 5V
Typical Voltage Gain -0.5dB

 

PT2399 Application Circuit Schematic

Following is schematic of PT2399 Application Circuit.

 

PT2399 Application Circuit

PT2399 Application Circuit

 

PT2399 Block Diagram

Following is PT2399 Block Diagram.

 

PT2399 Block Diagram

PT2399 Block Diagram

 

PT2399 Manufacturer

Princeton Technology Corp. designs, manufactures, and sells integrated circuits (ICs) for multi-media audio, remote control, and other electrical home appliances. The Company markets its products worldwide.

 

PT2399 Datasheet

PT2399 Datasheet

 

Using Warnings

Note: Please check their parameters and pin configuration before replacing them in your circuit.

 

PT2399 FAQ

① Is PT2399 an analogue?

The PT2399 is commonly described as a digital, or analog voiced solution.

 

② What is PT2399?

The PT2399 is a single chip echo processor IC utilizing CMOS technology. Which accept analog audio input signal, a high sample rate ADC transfer the analog signal into a bit stream then storage to internal 44Kbit RAM, after processing the bit stream will de-modulate by DAC and lowpass filter.

 

③ What do pin 15 and 16 do in a pt2399 circuit?

IC PT2399 from Princeton Technology Corporation. Pin 15 and pin 16 to form a capacitance by changing the external resistance to change the input frequency response of the inverting amplifier, as the signal input.

 

④ What is delay time for pt2399 VCO external setting resistors?

In addition, PT2399 VCO external setting resistors to the minimum, the delay time is 31.3ms, because of this a long time, not suitable for production of chorus or Flanger effects. Brief Description: IC PT2399 from Princeton Technology Corporation.

 

⑤ How to significantly improve a simple pt2399 delay circuit?

The total circuit rivals the simplest bare bones designs but approaches the performance of the more advanced circuits such as the PT80 delay. Below are the schematic, a picture of a breadboarded prototype and some example audio of the prototype below, in use.

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