Audio Echo, Repeat Effect Circuit PT2399

PT2399 circuit Heavy filtering allows for useful delay times and typical analog-like sound. The delay line starts just after 100n (after J112 JFET transistor).

This capacitor is just a coupling capacitor to block DC, JFET acts as a switch to allow or not allow audio to pass.

If you cut the PCB board by a millimeter from the sides, it is stated that it will fit in the 1590B model box. Box dimensions: 113 mm x 60 mm x 31 mm PCB size: 56 x 74 mm

PT2399 is a reverb audio integrated circuit using CMOS Technology equipped with ADC. DAC is used to create high sampling frequency and 44K Digital processing internal memory.

In addition to the delay time, it also has an internal VCO circuit in the system clock, so the frequency can be easily adjusted. PT2399 has very low distortion (THD<0.5%) and very low noise (<-90dBV), thus producing high quality sound output. Example guitar sound;

source: freestompboxes.org/viewtopic.php?f=13&t=15882