Delay time display?

[wui223]

Can someone suggest a circuit to enable display of delay time on LCD for a Rebote Delay 2 or PT80? I think this would be a cool idea

[Connoisseur of Distortion]

i don't think it would be worth the trouble...  :shock:

control circuit for all of the LCDs i have seen are more complicated than a Rebote itself!   :?

[Nasse]

Pin 5 says it is "clock out", if this has something to do with delay time you can do it.

I have been following that "tap-tempo" discussion and R.G´s "Dead Horse" story, and was thinkin "why people want this kind of features". I remember some old "instro" and rockabilly players telling something like "he had the tempos in the echo machine".

If the display thing is too much parts count or otherwise impossible, how about some known preset tempos, that you can fine tune in advance and when on stage just press the right button

[wui223]

Preset tempo is a good idea also, but how to imply it? Do i need memory or PIC in order to stock up the presets?

Seems like beyond DIYer capabilities already

[Connoisseur of Distortion]

for presets ( i know this is idiocitally simple, and thus probably not what you want ) why not have a rotary switch on the pedal, and a bunch of trimpots you can adjust and switch between?

[travissk]

You could do it using a microcontroller, but if you just want a few selectable delay times, just hook up some pots (or trimpots, or even resistors if you don't want to tweak later) to a rotary switch with the appropriate number of poles and throws.

Edit: oops, CoD beat me to this; I typed up a response and let it sit for a while. Consider this a +1

[gez]

Preset tempo is a good idea also, but how to imply it? Do i need memory or PIC in order to stock up the presets?

You could possibly do presets without the need for a PIC, reasonably simply too.  4017, 4033 and an LED display would do.  4017 would be used to control switching.  The switching could control an array of pots, so the 'presets' could be variable, or you could use fixed value resistors/whatever...would help if you linked to a schematic to see if this is viable.

The 4033 would count sequentially and would only display which preset is selected.  There are up/down counters (RG has something along those lines for a sequenced wah if I recall), so you could do it like that too.

Seems like a lot of work just for something that is 'cool' though...

[wui223]

yes it just 'cool'. But i was thinking even the comercial products dont have something like tweakable Delay Time and shown on LCD. So i am just curious the DIYer comunity could beat them. Well just a spontaneous wild idea

[Connoisseur of Distortion]

yes it just 'cool'. But i was thinking even the comercial products dont have something like tweakable Delay Time and shown on LCD. So i am just curious the DIYer comunity could beat them. Well just a spontaneous wild idea

depends on the commercial product. your average stompbox? hell no. your average modeler? yeah, a few   .  my PODxt does it... they really do get a bad rap, but their effects are nifty. maybe not the amp modeler...  

[Nasse]

How about separate output socket for clock, and an outboard freq meter, ready made or some kit/project and a look-up table for different delay times/tempo matching. Or a rotating disc with lots of stripes and the clock feeds some superbright leds, stroboscope tuning for delay time...

I got lots of hits when googled pic freq counter, the first one I looked briefly had a lcd display...

[wui223]

could u post the link or schem of the Freq counter with LCD display? I would like to start from there.

[Nasse]

just typed pic+freq+counter on google search engine and tis was first hit, just no idea if this project works

http://www.touchinglittlelives.org/counter/

I looked the PT2399 spec sheet and there is a table that says clock varies from 2 to 22 MHz at extreme settings

[Paul Perry (Frostwave)]

I looked the PT2399 spec sheet and there is a table that says clock varies from 2 to 22 MHz at extreme settings

Here's a problem though, the delay in milliseconds is inversely proportional to the frequency!! which is going to make the display a bitch to calculate :x

[wui223]

Inversely propotinal? Is it something like a reverse log graph?

[wui223]

How bout we transfer the resistor value at pin6 to the delay time and then display it? It might sound silly, but logically it should be work. Rather than counting the clock frequency. what i have in mind is something like the Digital Ohm Meter function which measure ohm value, then we convert it to delay time. BUT who know the equation of calculating delay time given resistor value? Anyone ?

[The Tone God]

I love seeing suggestions for "features" from people who do not understand the complexity of the problem(s). It sounds simple but sure ain't. As I usually point out with the industry if the feature was useful and/or easy to impliment then just about every commercial offering would have it.

Can it be done ? Yes but to do so is beyond the scope of skills the OP and most DIYers have which means someone would have to spend alot of time developing it for little or no return. This is going to be one of those "features" that are not going to have a high usefulness to time spent ratios.

Its not really worth the effort to make something like this just for shits and giggles IMHO.

Andrew

[Vsat]

Digital Scheme for displaying delay time:

Assume a 4096 stage BBD like MN3005 is being used.

delay = 4096/(2 x clockrate)

As example, for one second delay a clock rate of 2048 Hz is req'd. Make a digital counter that counts up to 2048 (simple binary counter) and wraps over, clocked from the BBD clock. Build a fixed reference clock with rate = 1 KHz. This clocks another binary (display) counter, when the 2048-stage counter overflows it  disables clocking of the display counter, the value in the display counter is fed to a set of binary-to-BCD display driver chips (something like CD4026) and the value shown in the LEDs is the delay time in milliseconds.  A lot of chips... maybe 8 to 10.... could be simplified if you use those HP or TI or Siemens alphanumeric displays with built-in counter/decoder/driver. Using a PIC or Atmel would be much easier, but if you like soldering...
Cheers, Mike

[wui223]

Thanks for all. Seems like this gonna be something beyond my skill (at least now). Yes, it may not be very useful. But how many effects we made for ourself is identical to each other and useful enough? I personally dont like to clone distortion effects now. Coz out of 10 units, 8 of it will be sound just similar. Nothing much difference to my ear. Just my personal opinion.

[Paul Perry (Frostwave)]

By inversely proportional, I mean 1/X.
It would (like many thngs) be easy to do in a PIC, just count between clock pulses (or a number of pulses), then do the reciprocal, then multiply by a constant & there is the answer, then some more programming to drive the serial LCD display.
If I had a second life I'd be a programmer. Too late now!!!!

[bwanasonic]

There are many relatively inexpensive rack units you can find that enter delay times in milliseconds. I use an Alesis Quadraverb GT in the loop of my amp for *timed* delays. Very useful for things like dotted eighth patterns. I made a  chart of delay/tempo settings for various note patterns. The Boss *Giga Delay* both displays times in ms, and has a tap tempo function.

Kerry M