Does anyone have any experience of adding an LFO to a deep blue delay style pedal or any other PT2399 delay for that matter?
Fuzz dog includes a pad available in the link below for one and I was interested to see what others had done. The pad attaches into the delay pot and the resistor of pin 6.
Necro-bump! Let's discuss this in more detail, because sometimes I need things spelled out explicitly. Perhaps someone else does too.. I actually had to reference a few schematics for this one, because adding an LFO is not a drop-in mod for the DBD circuit. It is easy though.
In order to add this:
Do not follow the advice of CowYoghurt on Reddit:
"You could add modulation to the repeats! I used this layout* for mine. It's designed for use with the deprofundis delay, so you need to make a few modifications for it to work with a dbd. You need to connect one leg of the LDR to a 2k2 resistor and then to ground, and the other leg to the middle pin of a On-Off-On spst switch. Then you connect one of the remaining pins to time 1 and the other to pin 2 of the pt2399. That way you should have modulated delay in one position, just delay in the center position, and a pseudo chorus in the other position."
*the vero layout I've attached to this post
Sorry, CowYoghurt. It didn't work for me. Instead, take a look at the PPCB Seabed and notice how the Delay lug 1 is connected directly to ground on one side, while the minimum resistor connects lugs 2/3 and pin 6 of the PT2399:
Whereas the Magnetron and De Profundis' Delay pots have a minimum resistor on the ground side of the Delay (Time) pot and the other side connects directly to Pin 6:
So here’s what I did with reference to the Seabed schematic:
• R17 - replace resistor with a jumper
• Clip lug 1 of the Delay pot, install 2.2k minimum resistor between clipped leg and the PCB pin. (Should be leg > resistor > PCB ground)
When the DP daughter board instructs you to connect a wire to [Time 1], connect it to the pot leg itself, not the PCB. Voila!
And here’s a short 1am sound clip of the cool chorus sound and the modulated repeats:
Hey, thank you @coltonius for such a detailed breakdown. However this particular issue has been driving me nuts for days and I've tried many posted solutions without success. Simply, I want to add the DeProfundis daughterboard (as per the same Vero layout you posted) to a Bow Echo PT2399 delay without the on/off/on switch - I just want full-time modulated delay. Whatever I seem to try gives me either delay or modulation but never together.
As the Bow Echo has a resistor before the time pot to ground, I replaced it with a jumper then added a 2k2 between lug 1 and the board. I connected 'Time 1' from the daughterboard to lug 1. Then connected the other side of the LDR ('Sw2') directly to lugs 2&3 on the time pot, to emulate the switch in the modulated delay setting. With the LDR connected to lugs 2&3 I get modulation only, disconnected I get delay only. I tried multiple combinations of the wires and lugs but could not get both on together. It seems like it shouldn't be this hard but I'm clearly doing something dumb...
