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Effect Echo is an electronic circuit that is used to delay sound or make an echo in an audio circuit . Using a circuit of echo is easy enough , we just set on the volume, and gain and trimpot near is rate of 20 K ohm to adjust how the desired echoes. This echo circuit using ic 4558D for additional amplifier and ic PT2399 as a major component that serves to echo , or repeat the sound output on the audio system. Click image to view larger  How to use it as follows : That is initially given the output of the mic input or other equipment. Then turn down the volume, and slowly raised, setting echo effect on the trimpot 20K. If not check back for the damaged to the circuit.

Digital Echo Processor IC PT2399 is using CMOS technology in audio purposes. Digital Echo Processor PT2399 is implementing the system in the process of ADC and DAC audio repro echo. Digital Echo Processor PT2399 has a high sampling frequency and 44K memory. Digital Echo Processor PT2399 to repro echo digital audio system of repro VCO delay time system that can be arranged. Digital Echo Processor PT2399 has a very low audio distortion of (THD <0.5%) and very low noise as well (No <-90dBV) so that the Digital Echo Processor PT2399 is capable of providing good audio quality. Digital Echo Schematics Description: Setting the external resistor from 10 K Ohm to 50 K Ohm. If the value is greater then the Delay Time also increases. Echo Digital Application Processor PT2399 Video Tape Recorder Video Compact Disk Television CD Player Car Stereo KARAOKE Mixer Electronic Musical Echo Audio Processor