Does anyone know the alternate wiring diagram for the TTT?

[acehobojoe]

I'm having issues with ticking on th forums tap tempo tremolo, couldn't find a pic of that wiring diagram. I just know I need to switch the pwm output to ground when it's off so I can get rid of ticking when it's disengaged... Couldn't find it in the thread. Thought I would ask here :p

[midwayfair]

I don't have a diagram, but there's really not much to this.

Open the datasheet. Locate the pin number for the PWM pin. Solder a wire to that pin or anything else in the circuit connected to it on the PCB (hint: the 10K going to the transistor). Run that wire to the anode of an LED. Connect a resistor to the cathode of the LED and then connect the other side of the resistor to the LED lug on your footswitch.

Or you can do the same thing but connect to the clock output instead of the PWM pin, which will give you the raw tapped tempo rather than the division and depth indication.

There are a half dozen other ways to do it. You could simply disconnect the rate LED that's already on the board and use the footswitch to reconnect it.

[acehobojoe]

Yea, the main thing was doing it with just a 3pdt switch. Thanks man! I'll get it going.

[acehobojoe]

could I simply shunt this 5v to ground instead? the LED would go off too. .. I guess it would go off with the pwm output too. that's the only thing.. I think I'll try those both

[midwayfair]

could I simply shunt this 5v to ground instead? the LED would go off too. .. I guess it would go off with the pwm output too. that's the only thing.. I think I'll try those both

I wouldn't do that. You might damage something, like the regulator, if you just start sending a power rail to ground. And if the chip isn't receiving power, you'd also reset it when you come out of bypass and won't be able to tap the tempo before you switch it on!

[acehobojoe]

Is there any possible way to do this while keeping the indicator led on? It sounds like I need to add another indicator with what you're saying.

[midwayfair]

Is there any possible way to do this while keeping the indicator led on? It sounds like I need to add another indicator with what you're saying.

You asked about switching the indicator LED off in bypass to prevent ticking, didn't you? If you want the LED to be on all the time, just connect it from the PWM pin to a 10K to ground and it'll stay on in bypass.

[acehobojoe]

that's the thing though... when it's off in bypass it ticks.. .

[Digital Larry]

I'd try a couple simple things...

Reduce the current going through the LED by using a larger series resistor, and smooth out the transitions by putting a fairly large cap across the LED to keep the voltage from changing quite so quickly.  Cap can't be too big or it won't go on and off though.

[karbomusic]

You mean this one?

http://www.diystompboxes.com/smfforum/index.php?topic=84020.0

The one I built has a couple of trim pots and the trick came down to led selection and the proper trim settings to get the best effect depth and LED brightness minus ticking. Ticking and correcting it should be covered fairly extensively in the thread above if that is the one you are speaking of.