Providence Chrono Delay Schematics? 7-seg display questions.

[bongoben]

I'm looking for a schematics sheet for the Providence Chrono Delay. My thinking (and correct me if it's totally off base) is that I want to build a Tap Tempo Tremolo using one of the musicpcb setups. But I would also like to add in a 4-digit 7-segmented display to show BPM/mS of the tap tempo. My assumption is that the display in the Chrono Delay is run with drivers that are separate from the main delay circuit in the pedal. If this is the case I could pretty easily incorporate the display setup into the Tap Tempo Tremolo project. This is just an initial thought on something I'd like to look into so if you already know it isn't going to work without completely redesigning the TTT pcb then I'll just pass and build the pedal as is. This is just something extra I thougtht I'd try. So, anyone have any sort of schematics for the Chrono Delay or any suggestions about the best route to take to get a tap display into the TTT pedal?

Thanks!

[mysteriousj]

My assumption is that the display in the Chrono Delay is run with drivers that are separate from the main delay circuit in the pedal.

I'm thinking a DSP probably runs the whole thing - controlling both the delay time and the display. So this will be kind of difficult.

The TAPLFO only outputs a PWM output and a clock output. You could possibly get a microcontroller to read the clock output then from that figure out the period/bpm and then use it to control the lcd. But that may be inaccurate and a bit of programming time too.

So in short it's probably easier to just do a complete redesign. If you're trying to sync devices CV might be a better way to do it.

[bongoben]

Thanks for the reply. The more I thought about it while I was at work the harder I forsee this project becoming. I want to build the TTT regardless but thought it would be kind of cool to add the display to sync up the tap times. I'll poke around a bit more to see what I can find.

[multi_s]

is the TTT code openly available? maybe we could add that functionality then give it back to them. haha. but seriously, if you can get the source for the mcu they are using this would not be hard to append as long as you have enough free pins, and if you dont just go to a larger pic with more pins. the end.

[cloudscapes]

yeah doing this without a microcontroller would be possible, but would require some serious CMOS wizardry probably involving like many large chips or something. a couple CMOS counters to count and multiply/divide/whatever the TAPLFO clock output, some more counters and conditional logic, binary counters and a 7-seg driver.

or a 14 pin micro and like 3 lines of code.