ilovefuzz.com

So I had a thought, I have seen circuits with dual PT2399 ICs but has their been circuits with more? What is the most that would sound decent? I figured each out would be the in for the next, and each would have pots accordingly - assuming of course the amps required aren't exceeded by the power supply (or the other way around - I'm a noob). I have heard a circuit with one IC and it only had one cycle, like one note would repeat one at a time until it decayed out, or until it was replaced by the next note. I remember the analog tape delays of long ago and one of them had like 6 or 7 heads. The speed of the tape was adjusted affecting the delay between repeats, the amount of heads would determine the amount of echo. So I thought, in theory, each PT2399 acting as a single head, and adding 2 or 3 for more reverb would be sweet. But, would each IC increase distortion? Thoughts?

el badger wrote:So I had a thought, I have seen circuits with dual PT2399 ICs but has their been circuits with more? What is the most that would sound decent? I figured each out would be the in for the next, and each would have pots accordingly - assuming of course the amps required aren't exceeded by the power supply (or the other way around - I'm a noob). I have heard a circuit with one IC and it only had one cycle, like one note would repeat one at a time until it decayed out, or until it was replaced by the next note. I remember the analog tape delays of long ago and one of them had like 6 or 7 heads. The speed of the tape was adjusted affecting the delay between repeats, the amount of heads would determine the amount of echo. So I thought, in theory, each PT2399 acting as a single head, and adding 2 or 3 for more reverb would be sweet. But, would each IC increase distortion? Thoughts?

This might be what you are looking for:

http://www.diystompboxes.com/smfforum/i ... c=106385.0

It's in the members forum so you may need to sign up if you aren't a member.

That was so sick and is exactly what I want to do. I checked out the schematic and it is a little more complex than what I had in mind but same idea. Sick sounding regardless. I wonder if the 'tails' are intentional or just a happy accident of the circuit . . . hmm. Do you know how I determine the total amps consumed by a circuit using a multimeter? I know I have mentioned this before, but I am 2/3 of the way done building this monstrosity of a box: 3 separate effects on one project. I was told by a member here that I can power this with a single 9 volt wall wart providing that either the amperes consumed by the unit do not exceed the supply's output, or the output does not exceed the amps needed by the unit. Would I use a multimeter for that one? I 'inherited' a pretty decent one and just need some pointer on using it for our purposes. . . lol.

el badger wrote:That was so sick and is exactly what I want to do. I checked out the schematic and it is a little more complex than what I had in mind but same idea. Sick sounding regardless. I wonder if the 'tails' are intentional or just a happy accident of the circuit . . . hmm. Do you know how I determine the total amps consumed by a circuit using a multimeter? I know I have mentioned this before, but I am 2/3 of the way done building this monstrosity of a box: 3 separate effects on one project. I was told by a member here that I can power this with a single 9 volt wall wart providing that either the amperes consumed by the unit do not exceed the supply's output, or the output does not exceed the amps needed by the unit. Would I use a multimeter for that one? I 'inherited' a pretty decent one and just need some pointer on using it for our purposes. . . lol.

Don't know how to measure that but I'm sure someone here does. I've two in a box sharing the same 9v, really depends on the circuits. I vaguely remember that thread.

You can get a pretty good estimate of the current draw by looking at the data sheets for the PT2399 and the op amps used. But I can tell you that a 100mA supply should be plenty, as a PT2399 usually draws 20-25mA and op amps are like 2-5mA each depending on which ones you are using. For a TL072, those are like 1.5mA per op amp, so it would only be 3mA total for the IC.