VOICE ECHO GENERATOR- SOUND TO ECHO SOUND CONVERTER CIRCUIT

A project has been designed around Holtek,s HT8970 voice echo IC.  Project can be used in various audio systems karaoke, toys, Animatronics, shows, displays, exhibitions, and sound equipment’s. The HT8970 is an echo/surround effect processor. It is designed for various audio systems including karaoke, television, sound equipment’s, etc. The chip consists of a built-in pre-amplifier, VCO or Voltage Control OSC, 20Kb SRAM, A/D and D/A converters as well as delay time control logic. The HT8970 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  RAM, after processing the bit stream will de-modulate by DAC and low pass filter. Overall delay time is determined by internal VCO clock frequency, and user can easy to change the VCO frequency by trimmer pot. Jumper J1 provided to select the Microphone input or External audio signal input, CN1 Audio Signal input, PR1 Audio signal level adjust, PR2 output audio signal adjust, PR3 sound delay adjust,

DOWNLOAD DOCUMENT AND SCHEMATIC

DOWNLOAD PDF DATA SHEET HT8970

FEATURES

  • Supply Input 5V DC
  • Onboard MIKE and Aux audio input ( Dual Option Selecting using Jumper)
  • MIKE and Aux  Selection via jumper
  • Input/MIKE signal level adjustable using Trimmer Potentiometer
  • It works in two modes – echo or surround
  • On Board Output signal level adjust Trimmer Pot
  • Onboard Trimmer Pot  for Sound Delay Adjust
  • Onboard LED for Power Supply Indicator
  • Four mounting holes of 3.2 mm
  • PCB dimensions 79 mm x 70 mm

 

 

 

 

 

 

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