Dynamic Tremolo

[Kipper4]

https://youtu.be/-5qVHjhR7EQ

[EBK]

Sounds like there are some very interesting textures at the very fast rate end.

Does your amp have a loose input jack? (Unrelated observation)

[Addy Bart]

Sounds great. How different is this to your Depth Charge tremolo, Rich?

[patrick398]

Very cool, what does it sound like on the random slopes peaks mode?

[Kipper4]

My test rig amp is a mess Eric, frankly.

@Addy Bart It's a different animal. It's an optical tremolo rather than a jfet controlled unit.
It has the Electric Druid StompLFO (8 wave patterns and lots of bells and whistles in an ideal 8pin dip package)

@Patrick very different to anything else I've heard.

Also intend to put a switch on so it can be dynamic or just a bog std tremolo. Except it has the advantage of multiple wave forms, depth control, onset, tap tempo.


Great fun.

[ElectricDruid]

Also intend to put a switch on so it can be dynamic or just a bog std tremolo. Except it has the advantage of multiple wave forms, depth control, onset, tap tempo.

Have you got a depth control for the envelope effect too? Or a sensitivity pot or something?

[Kipper4]

Nope I don't have a depth control other than the lfo pot to the chip. Excuse me I haven't memorised the pinout yet.
I use a 10k pot.
I don't have a sensitivity pot for the rectifier. I struggled to find a good value on the breadboard. Without affecting a wider range of open string.
I should go there again with more patience.


The rectifier is in my new thread.

https://www.diystompboxes.com/smfforum/index.php?topic=120240.0

I'm still not totally happy with it.
It's getting there.

[ElectricDruid]

Yeah, I was looking at the rectifier thread. Other people have got better ideas on that than me.

The Freq CV input on the StompLFO is pretty sensitive, since it cover 9 octaves in only 5V. So I can see the need to limit the output from the envelope follower a bit.

If I were you, I'd try and make the envelope follower pretty sensitive, so that you've got a decent envelope level coming out of the end of it and not so much problem trying to deal with tiny signals in the rectifier/smoothing stage, and then reduce the output before you send it to the Freq CV. But that's only general guidance and nowhere near a recipe for how to do it. Sorry, brain is fried today.

Tom

[Kipper4]

I've added an envelope gain pot and it's just got a lot more control.

It's getting there.

[Ben N]

Sorry for pulling this one up from the netherworld, but Rich, how'd this go? I was wondering how to go about marrying one of Tom's LFOs with an envelope like in the VFE Old School. The VFE has the option of dynamics modulating either depth or speed, but it seems to me that with the tap LFO, the only option would be depth, by means of an LDR in parallel with (or in place of) the depth pot. Or, I suppose, in series with the pot, with a resistor paralleling the LDR to bring the effective dark resistance way down, depending on whether you would want the trem to get stronger or weaker with the decay of the signal.
Maybe there's a way to restrict the envelope by running it through the PWM output of a microcontroller, which is inherently restricted to 0-5v? I suppose a crude way would be to manually pad down the analog input to the uC with a voltage divider (pot) so that the hottest signals top out at 5v PWM output. Or just set the saturation point at whatever volume you want the dynamic feature to cancel out at.
Alternatively, run the envelope through a hard limiter of some sort. Hey, it's a square wave, clipping doesn't scare it.