Dual Pt2399 Delay Schematic. Your ears can be the final judge but even most analog purists will give high praise to this circuit. Working out a reverb delay circuit using two pt3299 chips and a tl072 opamp.
The pt2399 basic echo circuit is the one where the delayed output is fed back to the input to produce echoes. I believe what they mean by surround is reverb which is actually sort of achievable more on this later in the mods section if you set your circuit up right. The small dsp in the pt2399 stores only a sample of the sound in memory for a few milliseconds.
Vco frequency vs delay time from the datasheet when the frequency of this oscillator is maximum 22mhz the delay time is minimum 31 3ms and vice versa.
The pt2399 basic echo circuit is the one where the delayed output is fed back to the input to produce echoes. The circuit is based around the pt2399 delay chip. I believe what they mean by surround is reverb which is actually sort of achievable more on this later in the mods section if you set your circuit up right. The minimum delay length is 30 ms and the maximum is 340 ms.
