Voice Echo Processor Module – Delay Device for Sound Effects, Echo, Reverb 

  • Rajkumar Sharma
  • 90 Views
  • moderate
  • Tested
  • SKU: EL127195
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The voice echo or digital delay sound effects project presented here is suitable for applications such as Karaoke, multimedia, musical instrument effects, electronics toys, animatronics, etc. The project is based on PT2399 chip, with an operating supply of 5V DC, and approx. 30mA current consumption. Two potentiometers are provided to set the delay and repeat. The delay range is adjustable from 50ms to 280ms.

The PT2399 is a single-chip echo processor IC utilizing CMOS technology. It accepts analog audio input signal, and a high sample rate ADC converts the analog signal into a bit stream that is stored in internal 44Kbit RAM. After processing the bit stream it will be de-modulated by DAC and lowpass filter. The overall delay time is determined by the internal VCO clock frequency, and the user can easily change the VCO frequency by changing the external resistance. The PT2399 performs low distortion (THD<0.5%@0.5Vrms) and low noise (No<-90dBV) characteristics for audio purposes.

Note1: With this board, the delay range is 50ms to 280ms which is adjustable using the potentiometer. The actual delay range is 31.3ms to 342ms, to achieve this alter the value of resistor R9 and Trimmer potentiometer PR2.

Note2: The PCB has provision to mount Trimmer pot or 16MM potentiometer, install any of this as per requirement, PR1 Trimmer Pot = P1 16MM potentiometer, PR2 Trimmer Pot = P2 16MM potentiometer.

Connections and Other Important Details

  • CN1: Power Supply Input >> Pin1 = VCC 5V DC, Pin2 = VCC 5V DC, Pin3 = GND, Pin4 = GND
  • CN2: Audio Signal Input from Musical Instruments or Microphone Preamplifier >> Pin1 = Audio Signal Input, Pin2= GND
  • CN3: Audio Signal Output >> Pin1 = Audio Signal Output, Pin2= GND
  • CN4: Optional 3.5MM EP Female Connector for Audio Output
  • CN5: Optional 3.5MM EP Female Connector for Audio Input
  • PR1 or P1: Potentiometer to Adjust the Delay
  • PR2 or P2: Potentiometer to Adjust the Repeat
  • D1: Power LED

Features

  • Power Supply 5V DC @ 30mA
  • Delay Range 50ms to 280ms (Read Note 1)
  • Accept Standard Audio Signal
  • On Board Potentiometer for Delay Adjust
  • On Board Potentiometer for Repeat Adjust
  • On Board Power LED
  • EP Socket for Audio Signal Input and Output
  • Optional 2 Pin x 2 Header Connector for Audio Input and Output
  • 4 x 3MM Mounting Holes
  • PCB Dimensions 48.10 x 38.58mm

Applications

  • KARAOKE Mixer
  • CD/DVD Player/Recorder
  • Multimedia
  • Animatronics
  • Music Instrument effecter
  • Electronics Toy

Schematic

Parts List

NO.QNTY.REF.DESC.MANUFACTURERSUPPLIERPART NO
11CN14 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY 732-5317-ND
21CN22 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY 732-5315-ND
31CN32 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY 732-5315-ND
42CN4,CN53.5MM STEREO EP SOCKET FEMALECUI AUDIODIGIKEY CP1-3525N-ND
51C13K9PF/50V SMD SIZE 0805YAGEO/MURATADIGIKEY
62C2,C64.7uF/50V OR 16-25V ELECTROLYTICPANASONICDIGIKEY P10321-ND
73C3,C16,C170.1uF/50V SMD SIZE 0805YAGEO/MURATADIGIKEY
81C4100uF/16V OR 25V ELECTROLYTICUNITED CHEMDIGIKEY 565-EMHL250ARA101MF80GCT-ND
92C5,C910uF/50V ELECTROLYTICNICHICONDIGIKEY 493-12569-1-ND
102C7,C10560PF/50V SMD SIZE 0805YAGEO/MURATADIGIKEY
111C847uF/16V OR 25V ELECTROLYTICNICHICONDIGIKEY 493-10997-1-ND
121C110.01uF/50V SMD SZIE 0805YAGEO/MURATADIGIKEY
132C12,C148K2PF/50V SMD SIZE 0805YAGEO/MURATADIGIKEY
142C13,C15DNP
151C183K3PF/50V SMD SIZE 0805YAGEO/MURATADIGIKEY
161D1LED RED SMD SIZE 0805LITE ON INCDIGIKEY 160-1427-1-ND
171PR150K POTEMTIOMETER PCB MOUNT 16MMBOURNS INCDIGIKEY PDB181-K220K-503B-ND
181PR220K POTENTIOMETER PCB MOUNT 16MMBOURNS INCDIGIKEY PDB181-K420K-203B-ND
192R1,R1215K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
201R2100K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
211R31K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
221R44K7 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
235R5,R6,R7,R10,R1110K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
241R85K6 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
251R92.2K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
261R130E SMD SIZE 0805YAGEO/MURATADIGIKEY
271U1PT2399 SMD SO16EBAYDIGIKEY http://www.princeton.com.tw

Connections

Block Diagram



VCO Frequency Table

Gerber View

Photos

Video

PT2399 Datasheet

PT2399

PCB

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