guitarpcb.com d'lay tails mod

[pinkjimiphoton]

dudes.wire the input and output of the board to the input and output jacks.break the connection at the c17 r8 node. add a spdt switch.
BOOM!
d'lay suddenly has tails. the thing has enough buffers in it so switching that one connectionworks mint.
try it and tell me what ya think.
sounds great like this. extra added bonus it's always a buffer on for the end of your chain. couple wiring mods. done.
PjP

[ElectricDruid]

Nice, Jimi.

I wonder if there's any percentage in putting the switch the other way around, and then wiring pin 3 to ground so that the filter/delay input is grounded when it's not used? It's connected directly to the rest of the internal circuit, so it'd need to be the Vb 2.5V virtual ground, not the genuine 0V ground or the 4.5V Vref.

If it works already and doesn't make any clicks or ticks when you switch it, it's probably not worth it. It was just a thought.

[pinkjimiphoton]

it clicks that way. this way it just works, and is easy breezy.
if ya ground the input to it, it affects the tails, too.

no clicks. the first attempt, i tried just switching the input, but in bypass the load from the circuit cost too much signal. this way, its buffered on both ends, and no clicks. its no longer true bypass, but in general, i run delays last so it gives a nice line driver back to the amp.

[Mark Hammer]

I've been thinking about such "interruptions", since trying to use the "trails" mod I did to an Echobase pedal I made for myself.  The problem is that simple interruptions result in the very clicks, pops and other artifacts that Tom/Druid notes.  Since switch-popping with "hanging" capacitors will vary, depending on how often and how recently, one has used the switch, it can seem to be a non-problem, only to return later.

I think the solution is to co-opt something we see in FET-switched pedals.  And since we're talking about delay, I'll use a delay circuit as an example.

Q5, in the circuit shown here is turned on by a voltage from the flip-flop sub-circuit, through R29 and D2, to the gate.  But, critical to pleasing artifact-free functioning, is C24, which adds some lad in conjunction with R29, such that Q5 never turns on OR off instantly.  It certainly changes state quickly, but never so quickly that it is jarring or slowly that it leaves you silent or effectless for a noticeable period.

What I'm building to is that a more usable "wet-input-kill" might be had by having a JFET drain connected to the junction of C17 and R8, and its source tied to ground.  A footswitch that fed a suitable voltage and current through a diode to the JFET gate, with some lag provided by a suitable cap, would provide  a pop-free transition from normal delay functioning to just-the-tail.  One could even select between two or more cap values to have slower and faster transitions between state.   

You will note that Q12 in the Boss CE-1 is used to gate out the wet signal if you stop playing (so that your audio output isn't just clock noise).  In that application, the gating is provided by an envelope follower, but the basic principle of using a JFET to ground to "blank out" an unwanted signal is the same.

[pinkjimiphoton]

true, this may be the optimal way to do stuff,
but i tried it thru a couple amps, including at insane gain levels, no pops.
i was rather surprised, actually, cuz originally i used a pull down resistor on it, and THEN it popped. without it, none.
this way .... and i'm not saying its "right"... seems to work great. minimal change to the circuit or project. its always on, true, but i'm ok with that.

i'm assuming the ESR of caps c7 and c8, with resistors r5-r8 going to a lpf is absorbing any "click" and functioning as a pull down here.

i will try and get some video of it over the next day or so so you guys can hear it.

remember, i'm a fuzz guy, so for me, to do this starship enterprise shit <g> is tumescifient

[pinkjimiphoton]

one stupid pedal trick, commmmmmmmmmmmmmmmmmmmmmming up...

https://www.youtube.com/watch?v=VBU16TJTsb8&lc=UgzhLmk9PUN2N4U5xuh4AaABAg

[deadastronaut]

jimi, got a nice easy, and very lush after chorus mod for ya...i just discovered on breadboard with a rebote 2.5

take a 1m from pin 6 to 8.

then take a 820k from 6 to 7 .

make it switchable, and you have 'optional' lush after chorus on the delays... ...

slight wobble , just enough to turn it into

lush delay.... enjoy.