Tap Tempo with LED

P

PTRiot

New member
Hey there. Kinda new and trying to learn. And honestly not entirely sure if I am using the right terms, but here it goes.

I'm working on a tap tempo for multiple effects. The idea being that I have one foot switch for multiple effects that have the external option. Like having a Boss DD8 and a EHX Canyon going to a single device. My plan so far is having multiple jacks going to one pedal with a relay and an on/on switch for open/close options for different pedals. Image below to show my idea. Plan is to daisy the 9V power from relay to relay when I add more jacks.

I guess the first question I have to ask is if this idea would work? I'm honestly unsure if a relay is a good idea or not. Or if daisy chaining the 9V power will cause other issues.

Second question is, assuming it does work, how could I add a blinking LED to indicate the actual tempo I'm setting? I don't really know where to start with this specific subject.

TapTempo.jpg
 
Here is the more-or-less complete idea of what my intentions are. It's a quick n dirty drawing. Hopefully this makes sense.

TapTempo v2.jpg
 
Relays seem like overkill
A 5v regulator and a couple AND/and gates would be smaller and cheaper. This is assuming 5v trigger will work for all devices.
 
Theres also solid state switch ICs that would likely perform the function. The big question is what's the voltage required to be returned to the tap circuit and can the switch IC switch that level of voltage
 
I have a bunch of the 9v relays above from a different project from work, and was trying to repurpose them. I'm still learning about electronics, so I'm interested in understanding your suggestion. Do you have any examples I can look at to help me understand how they work?
 
A 4PDT footswitch is basically four switches in one.

There are four sets of SPDT contacts inside, when you press the footswitch all four are activated simultaneously but they are electrically isolated from each other.

You can just wire it up directly to the tap out jacks. As long as the devices you're connecting it to expect a passive tap switch it'll work with no other circuitry.
 
I was looking at a 4PDT switch, but wasn't initially finding a momentary switch until you posted that. Which is a major plus.

I had the on/on switches after the relays initially because I thought I read that some pedals are set to be open momentary switches and others are designed around closed. Is that actually a thing? Or did I misunderstand that? And if that is the case, would I need to wire this differently?

I'm going to start looking into CMOS timings. Thank you for the start on things I can look into for that.
 
PTRiot said:
I had the on/on switches after the relays initially because I thought I read that some pedals are set to be open momentary switches and others are designed around closed. Is that actually a thing?
Click to expand...

Yep, and you can still do that because the 4PDT is four SPDT switches so that part of your schematic can stay the same.
 
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