debrad
Active member
I recently bought a Tap Tempo board from another site in hopes of adding this functionality to my Cataclysm (Disaster Transport Jr.) build. I’ve been going through some of the documentation today and think I have a handle on just about everything except the difference between the Cataclysms B50k "Time" potentiometer and the replacement B100k pot on the tap tempo board.
In stock form, what difference does 50k vs. 100k make on the time function given the PT2399 portion of the Cataclysm schematic (below)? Will there be a significant change to the circuit if I just use the 100k pot instead of the stock 50k?
If you think I should stick with the Cataclysm's 50k pot, I read that the Tap Tempo controller chip (TapTation kit) can simulate the 50k value by connecting the board's Tempo Double Time input to ground. On the tap tempo board, Pin11 of the IC goes to a SPST “double time switch” (S4 on the TapTempoBoard Schematic below) which is either open or connected to ground. Would that be my “Tempo Double Time input” or is that the “output”? Since it switches between open and ground, am I safe in assuming that is NOT the output and that connecting it to ground before the switch that switches it to ground wouldn’t help with the 100k vs 50k pot issue? Would I take something else to ground to take care of this?
My final question: the delay circuit that the Tap Tempo board was developed for shows a 1K resistor coming off PIN6 of the PT2399 BEFORE the 100k Time control (R9 on the DLay Schematic below) while the Cataclysm circuit shows a 1k resistor (R15) AFTER the 50k Time control (the tap tempo board taps off the R9 resistor replacing the B50k Time pot AND the parallel 150k resistor (R22)). Should I make sure there is still a 1k resistor in series with the Time control given the fact that the TapTempo board has ANOTHER 1k resistor (R6) in series with its Time control (i.e. the DLay circuit has 2k in series with the Time pot after the mod...should the Cataclysm have 2k also or just the 1k on the tap tempo board)?
Thanks so much. I look forward to your replies.
- brad -
In stock form, what difference does 50k vs. 100k make on the time function given the PT2399 portion of the Cataclysm schematic (below)? Will there be a significant change to the circuit if I just use the 100k pot instead of the stock 50k?
![CataclysmPT2399 Schematic.JPG CataclysmPT2399 Schematic.JPG](https://forum.pedalpcb.com/data/attachments/6/6858-2f7631dac649e0e12d2e9dd5f95f35b7.jpg)
If you think I should stick with the Cataclysm's 50k pot, I read that the Tap Tempo controller chip (TapTation kit) can simulate the 50k value by connecting the board's Tempo Double Time input to ground. On the tap tempo board, Pin11 of the IC goes to a SPST “double time switch” (S4 on the TapTempoBoard Schematic below) which is either open or connected to ground. Would that be my “Tempo Double Time input” or is that the “output”? Since it switches between open and ground, am I safe in assuming that is NOT the output and that connecting it to ground before the switch that switches it to ground wouldn’t help with the 100k vs 50k pot issue? Would I take something else to ground to take care of this?
![TapTempoBoard Schematic.JPG TapTempoBoard Schematic.JPG](https://forum.pedalpcb.com/data/attachments/6/6859-3d00478eeffcfa4d8d1f57dc7de7570a.jpg)
My final question: the delay circuit that the Tap Tempo board was developed for shows a 1K resistor coming off PIN6 of the PT2399 BEFORE the 100k Time control (R9 on the DLay Schematic below) while the Cataclysm circuit shows a 1k resistor (R15) AFTER the 50k Time control (the tap tempo board taps off the R9 resistor replacing the B50k Time pot AND the parallel 150k resistor (R22)). Should I make sure there is still a 1k resistor in series with the Time control given the fact that the TapTempo board has ANOTHER 1k resistor (R6) in series with its Time control (i.e. the DLay circuit has 2k in series with the Time pot after the mod...should the Cataclysm have 2k also or just the 1k on the tap tempo board)?
![DLay Schematic.JPG DLay Schematic.JPG](https://forum.pedalpcb.com/data/attachments/6/6860-990041a106c5ca371df1f504dcfaf05e.jpg)
Thanks so much. I look forward to your replies.
- brad -