Build Your Own Clone Message Board

I have not check, but is there any sort of capability of the echo IC to capture tempo?

It would be nice to have a tap /c switch to capture the timing, and then a divide by 2/4/8 (maybe even 16) network to establish the repeat timing based on the time sample.

This would be no differnet than many tap tempo features of other (possibly more complicated) commerically available effects.

Similar features would be useful to varying degrees in any of the effects that have a time constant such as the phaser, vibrato, tremolo or chorus for that matter, but may be more difficult to implement if the feature is not directly supported in the underlying technology.

I got spoiled by my G-Force.


Barry

If you're going to go that far, you want dotted-notes and triplet values available too

...and someone else to play the guitar while I sit back and enjoy...

You can't get that Edge-like 'click' without a dotted 1/8th note!

Of course. Thanks.

This is a cool site. I have a CNC mill that I have always wanted to use to engrave pedals. That is exactly what this guy does.

http://www.cusackmusic.com/?page=detail ... em=t-Shirt



Barry

A year and a half later...

Thought I would let you guys know of a tap-tempo mod for your digital delay pedals.

PTAP controller

It's just two chips: a micro-controller and digital pot that go in place of the delay knob. Nothing fancy as far as the hardware.

As-is it only has one output for one PT2399, so this would be less useful for the BYOC crowd unless you have the pre ping-pong digital delay. However in development I used one controller with 2 dual pots to control 4 PT2399s, and so a version for dual chips should be available soon if there's interest.

Nice! People have been asking for this for a long time!

Questions...Does this require it's own 5v source or can you grab it from the existing one powering the PT2399?


How do you get it back to manual mode when it's in tempo mode?


I'm not seeing this clearly on the schematic. What is T3 exactly, another part or pins 5-7 of the MCP? I'm confused as to what T3 represents and how you tie it into pin 6 on the PT chip.

Thanks!

I would give it it's own power and use another regulator as in the schematic. While it doesn't draw much it is a digital part and as such you need to take every precaution to keep noise out of the analog audio circuit.




Hold down the switch for 2 seconds.



T3 is just a 3-pin terminal. I didn't use a resistor symbol since I didn't want there to be any confusion about adding another resistor there. The pin numbers match those on the 50k pot (1=CCW, 3=CW.)

I'll re-draw it to make things clearer.

Thanks!

Sorry - I haven't worked with a digital anything other than the PT chip. Is T3 a terminal for a separate digital pot then, or what do you plug in there? Do you have a part number for it?

The terminal was just representing three holes to solder wires to if you were to make a PCB for that particular schematic. It's not an additional part.

I re-drew that area so it may be clearer now. The three lines in question are the CW, W, and CCW points on the digital pot. They go to wherever the CW, W, and CCW terminals of the original pot were.

Ah - okay. That's what I was misunderstanding. Thanks again, can't wait to try it out!

Has anyone added a tap tempo switch to their analog delay pedal from BYOC? I would like to build this kit, but I would really like to have the tempo switch. Any pics?

This particular chipset is designed for the old BYOC DD-80 or the current Tonepad Rebote 2.0/2.5. It does look like Decc may be working on a version for the BYOC analog delay too though.

tap tempo on the analog delay would be a pretty sweet option and i'd have to buy one if it had it. i've also thought that the ping pong would be sweet with separate tap controls for ping and pong. i'd love to hear how this works out. keep us posted!

For the ping-pong: the PTAP is actually a stripped down version of a tap-tempo controller I made just for that. (There is still one tap foot switch but the two delay knobs can select different beats for the ping and pong.) A little more space is required since we need more pins on the MCU and a double digital-pot but it's essentially the same thing.

As for the analog delay: I have a couple different test circuits that should in theory work. However I haven't gotten around to building an analog delay to actually test them with. Hopefully I'll be able to get to that soon.

Sweet! Again, keep us updated! Good luck!

if only there was an icon for how far over my head this is...

I just suck at reading schematics... I am ready to turn my digital delay (the old one) into a tap-tempo delay. I see that I need to buy those 2 chips.. and another footswitch it looks like. I guess I would have to drill a hole as well.

Is there a more detailed guide on how to do this?

I plan on building a Rebote delay with the PTAP mod for someone this weekend and I'll take pictures so that it may be clearer. But from the schematic we see you need at minimum:

1. PTAP chips (MCU and digital pot)
2. The 10k resistor (R2) on the RESET pin of the MCU
3. A momentary, normally-open footswitch (and obviously another hole to mount it on.)

However, we don't want digital noise from the MCU sneaking in to the audio signal. So instead of using the +5V that is already powering the PT2399 we add in:

4. A 78L05 regulator (U2), which provides +5V to just the MCU and digital pot

Finally, some "best practices":

5. C1, C2, and C3 for power filtering
6. A protection diode D1. If you already have one on the main delay board then you don't need another.




I haven't forgotten about this. I'll have a link up for the ping-pong tap tempo control this weekend too.

Here are a couple pictures of the chips being added to a standard Rebote delay. In the first picture all that has been done is the three wires from the delay control pot have been disconnected from the Rebote PCB.



In the second picture the 2 chips and support circuitry from the schematic have been added on the small green board. (They are mounted on a PCB I had made but the circuit is simple enough to do on perf/vero.)



First, +9V and ground are connected to the tap board. Then the three wires from the delay pot are connected to the tap board and three new wires corresponding to the CW, W, and CCW points on the digital pot are connected to the Rebote board where the old pot was. Finally, on the left you will see the added tap footswitch which, when pressed, shorts the "tap" input on the controller to ground.

(Pardon the blacked-out square on the board. There are development parts there that I didn't want anyone thinking were required.)

i'm really confused.. i dont have much knowledge in reading schematics, what would it take to add this tap tempo to the new digital delay pedal?


is there some sort of diagram?

If you mean the BYOC Ping-Pong, this device won't work for that. It only handles a single PT2399 chip (so this would be for the old BYOC digital delay, Rebotes, PT-80, etc.). I expect to have free time this weekend to finish a version for the ping-pong though.

But for those having trouble understanding how this works: the basic idea is that in a "stock" pedal the connections are:

50k delay control pot --> PT2399

with the controller added:

50k delay control pot --> [microcontroller --> 50k digital pot] --> PT2399

So you are essentially just slipping it in between the delay knob and the delay chip.

Are you going to sell the PCB's for these? I'll sign up for both the single and the double Actually, two singles...

I'd sell the PCBs too if I could figure out an economically acceptable way to do it. (I was able to have a couple made by piggybacking on someone else's panel order for unrelated non-FX work he was doing.) Since only a handful of people have mentioned interest in a PCB I don't want to do a small (read: 100 ct.) production run and end up with a pile of useless boards. BatchPCB would probably work now that I think about it. I'll put that on my "to do" list.