7/14/2023 0 Comments Best simple delayIdeally, this should be a log pot, although lin pots are usually cheaper and easier to come by these days. I haven’t labelled it, but the volume pot is 10k. I simplified the circuit even more, and adjusted some of the capacitor values to lengthen the delay time and keep the noise to a minimum, and ended up with this first version: I managed to get a number of them at about 11p or 12p each, and researched the simplest circuits I could find to make a suitable delay unit. The pin assignments and application circuit are optimized for easy PCB layout and cost saving advantage.’ PT2399 boast very low distortion (THD<0.5%) and very low noise (No<-90dBV), thus producing high quality audio output. Digital processing is used to generate the delay time, it also features an internal VCO circuit in the system clock, thereby making the frequency easily adjustable. ![]() Once I came across the PT2399 chip, I knew I’d found the answer.Īccording to the datasheet, the PT2399 is ‘an echo audio processor IC utilizing CMOS Technology which is equipped with ADC and DAC, high sampling frequency and an internal memory of 44K. In particular I was looking for a circuit that would be inexpensive, simple to put together, and easily repeatable in different units I might construct or circuit-bend. Next, one of the things I felt percussion instruments would benefit from was a reverb/delay circuit, and I had been looking around for a long time for something suitable. ![]() Each of the instruments had its own appropriate preamp, either a piezo type or electret type, as described earlier in the series. In the electret series I had made 2 new instruments in which sounds would be picked up by electret elements, and had identified 2 existing instruments, a xylophone and glockenspiel, which needed amplifying in a similar way. In the picture below, the one on the left has 4 lengths of piano wire soldered to a large (50mm diameter) piezo the second one has a snare from a snare drum attached to a large, shallow tin the third one has an adjustable rubber-lined clip designed to hold a Latin American-style rainstick and the right-hand one is a circle of sandpaper with a piezo disc firmly superglued to the back. In the previous post in the piezo series I had prepared 4 percussion instruments, all based on making sounds to be picked up by piezo discs.
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