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2 PT2399 Internal Circuit The main problem with the PT2399 is to understand the internal circuit, the Princetown datasheet is not very helpful This block diagram could be redrawn in a more logical and simpler way This chip effectively includes 6 internal opamps ( that the designer can use) and a power supply subsystemPT2399 input signal amplitude is about 3Vpp signal level higher than this range will be limiting In the above diagram, the change of pin 15, pin 16 of the resistive and capacitive components, you can change the input frequency response;Nov 30, 12 · Circuit Diagram, Electronic Components November 30, 12 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 demodulate by DAC and lowpass Echo Effect Preamp Board For Microphone With Pt2399 Ic Diy Hindi Electro India Youtube Ic 23