This is the schematic diagram of echo chamber circuit which will convert the input sound to have echo sound just like if you talking in the cave. This echo chamber circuit can be applied on any source of audio signal like microphone, mp3 player, radio, etc. The aims is smoothing the voices with echo. The MN3005 is a world’s first 4096-stage long delay BBD, 8 times longer than S12-stage BBD manufactured by using a P-channel low noise silicon gate process. Long signal delay time 205ms can be obtained at clock frequency 10KHz. S/N is 75dB. S/N has been improved by more than 20dB in comparting with 8~connected S12-stage BBD’s. The MN3005 is suitably used for reverberation and echo effects in electronic musical instruments such as electronic organ, guitar amplifier and music synthesizer which need long delay time.The MN3101 is a CMOS LSI generating two phase clock signal of low output impedance to drive MN3000 series BBD. Built-in VGG power supply circuit for the MN3000 series BBD* provides...