Modded Faux Analog Echo

I did my own layout for the Faux Analog echo using the schematic by Intripped on freestompboxes.org

But I modified it to use an analog fet switch and wired it to have two modes, true bypass or buffered bypass with tails. I also included a temporary DPDT footswitch and a SPDT that you can use to have a temporary ON or temporary OFF effect when the pedal is on, either in true bypass or buffered bypass modes. Watch the videos below to see how it works and all the posibilities it offers.

Analog FET Switch, daughter board for Deep Blue Delay with Tails mod

I'm aware that my Deep Blue Delay with TAILS mod is being used as it is one of the most visited post on this blog, and the DBD is quite popular in the DIY community, but I'm not happy with my mod. After using it I realized that it doesn't always open completly, so the delay line continues engaged. In this post I present what I think it's a better alternative, although I haven't tested it so this is NOT VERIFIED,

I took the mod idea from the Small Time Delay and used the same implementation, but the mod is just an Analog Fet Switch, used in a lot of pedals in the "non true bypass" era. In the next article you can see how it was used by DOD.

It uses a flip flop and two fet switches. You can simulate the switches easily in LTSpice with the next schematic, but we only need one.

You can read more about FET switches at this thread on DIYSB, I have read a lot but I don't feel qualified to try to explain it. I just realized that it should work better with the DRAIN and SOURCE of the FET biased properly rather than relying on the previous and next circuit sections to do it.

I haven't tested it so this is NOT VERIFIED, but this should work better as a daugther board for the DBD Tails mod. The green wire should connect to A in my modified layout, and the blue wire to B. For the indicator LED take the V+ from the control wire.

This is the DBD modified layout (the same I posted on 12/2013)

If anyone try this, let me know to tag it as verified.

Deep Blue Delay with TAILS mod

Update 03/2015: see this post for and alternative daughter board.

I have modded my Deep Blue Delay because I really think that having tails is an essencial feature for a delay pedal. I took the idea from the Merlin's Small Time Delay. By adding a FET analog switch at the input of the PT2399 we can bypass the input of the IC while getting the output in form of tails.

The analog switch is in a daugther board. Terminals A & B are interchangeable in the main and daughter boards. Using a DPDT on/on and a 3PDT footswitch we can select between buffered bypass with tails and True Bypass.

Using the layout by Mark the mod include adding a cut, moving one leg of a resistor one row down and moving one 1uF cap. The A and B wires have to be soldered in the middle of the board instead of on the side but there is enough room for them without moving other components.

This is the layout with mods.

This is the daughter board with the off board wiring.

I built mine without the volume mod, and this is how it's looking, with a few scratches on the paint but I like it.

In this pic you can see the daughter board next to the output jack.