Stone Deaf Tremotron (because mucho LEDs)

[drgonzo1969]

This is a somewhat silly wishlist post but I love this pedal design. I first saw it on That Pedal Show years ago. The LEDs that indicate the level on the potentiometers are sweet. It's a cool tremolo too but other tremolos can do the same tricks... I really just like the LEDs. Would it be possible to make a little pcb for a adding LEDs to potentiometers on other projects? just a thought. heres some demos.

 

[VanWhy]

Interesting. I just added the SynchroTrem to my wishlist. I wonder how close they are.

 

[Robert]

Would it be possible to make a little pcb for a adding LEDs to potentiometers on other projects? just a thought. heres some demos.

It can be a little tricky depending on the circuit you're adding it do... If it's digitally controlled (like I suspect the Tremotron is) it's as simple as lighting up the correct number of LEDs depending on the position of the pot since you already have a numeric value for the pot position.

If it's a completely analog control the easiest way to do it would be a dual-gang pot, one gang for the audio circuit and the other to sense the position of the pot. You'll still need some sort of decoder, whether it be CMOS or a microcontroller, to calculate and light the appropriate number of LEDs.

 

[Robert]

Didn't someone here do this with an LM3914?

EDIT: Yep.

Post in thread 'Is it possible to use an LM3914 and LEDs to show the value of a volume or drive pot?'

Mar 4, 2023

You can if you use a dual gang pot.

Connect lug 1 to ground, lug 3 to VCC (or what ever your maximum reference voltage is for the LM3914), and lug 2 to the input of the LM3914.

After finally finding the right search terms, I found a couple of crude videos and came up with this.

• KR Sound

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