It'd certainly make tap tempo for the PT2399 simpler.I need your help because I need execute a sync delay similar to Arduino function built-in. Until someone gives it a go, we won't know if it works or not. I suspect the key word there is the fourth one along: "potential", e.g. There are 2 potential applications for this pin: In this way, the user can control the amount of delay in a precise way, but again it is difficult to say that the benefits will pay off extra circuitry and complexity. Override the pin 5 signal using an external clock source. It is not clear that the benefits of reading the internal clock would overcome the extra circuitry and complexity of this mod. To do this, a microcontroller needs to be used and also because of the high-speed of the clock frequency (up to 22MHz) a pre-scaler (that would reduce the accuracy of the readings) needs also to be used. Use the pin 5 clock frequency information in a feedback loop to get the accurate reading of the time delay. Quote There are 2 potential applications for this pin: Here's where I had gotten the idea from (the link in the first post). But you can control pin-6 and use the signal coming out of pin-5 to monitor the delay time and so make any corrections, creating a feedback control loop. If you succeed, you'll gain eternal glory, at least in the DIY pedal realm. There are lots of possibilities PWM-driven vactrols, transistor current sources, digipots, other types of switched resistor array, etc etc. You just need to work out some way to control a current source with an Arduino output. The Arduino has timers and things that can measure the frequency for you. That allows you to set up a loop where you can auto-calibrate so your Arduino code can learn what output it need to produce to get Clock Frequency X (and therefore delay Y). The other thing the chip is famous for is not easily coming out of a locked-up state without being at least powered down and back up, and some people say even having all the pins discharged on a piece of tinfoil!Īs an alternative, the pin 5 output shows you what the internal VCO is doing (ok, roughly - those waveforms are pretty heavily rounded) so you can control the VCO frequency using the current drawn from pin 6, and then monitor the frequency you get from pin 5. That's pure speculation, however - not even a plan. If it were possible, it might be by holding the VCO in some "off" state (and we know that's possible with certain pin 6 voltages - this is a chip that's famous for "locking up") and then over-riding the locked output with the input clock at pin 6. That chip has been pretty thoroughly experimented upon, and many have been smoked in the process! It might be that there is yet another undiscovered trick lurking in the circuits of the PT2399 that would make such a thing possible. You're talking about over-riding the internal VCO and replacing it with an external clock. Quote from: nicksorenson on April 29, 2020, 12:57:36 PMĬan I just input whatever frequency square wave I'd like to pin 5 and change the delay time accordingly?
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