This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Wednesday, October 19, 2016

Valve Wizard Small Time

Here's Valve Wizard's take on the PT2399 delay. It's very similar to most PT2399 delays out there, with a dual op-amp providing input and output buffering. This was designed with the tails function and it uses Valve Wizard's usual J112 switching. Here's his original schematic and explanation of the circuit. You can also use a DPDT footswitch for bypassing, using one side to turn the delay on/off and the other for LED indication. I've included 2 extra pads on the PCB layout for this function. If going this route, don't populate the J112 along with the 1N4148 diode, 1k and 4.7k resistors, and 10ยต capacitor round the J112.


6 comments:

  1. Verified this over the weekend. It sounds great! I used the original J112 switching style.

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    1. So I slightly jumped the gun on this... The effect works and sounds pretty good. The long repeats are a little low fi, but that's ok.

      The switching circuit must be wrong somehow... The LED is on when the effect is off, and turns off when the effect is engaged. Furthermore, I get a pop when turning it off or on that goes through the delay circuit, so it's really noticeable. I haven't gone through the schematic to check for errors yet, but at a quick glance it looks right... Not sure why these things are happening.

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    2. J112 is backwards on the layout. Looking at valve wizard's doc confirms it.

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    3. So, turning the J112 de right orientation makes it work well?

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  3. Works as it is in the schematic? Or do you have to change something?

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