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DIY Stompboxes => Building your own stompbox => Topic started by: harrisxr650 on January 26, 2023, 07:55:40 AM

Title: PCB Guitar Mania - Submarine vibe (EQD - The Depths clone)
Post by: harrisxr650 on January 26, 2023, 07:55:40 AM
Hi,

I'm trying to add a rate led to this build but i cant figure out how.
Can someone check the schematic and advise how to if possible?

Thanks


(https://i.postimg.cc/Z0m0yBzF/depths-schematic.jpg) (https://postimg.cc/Z0m0yBzF)
Title: Re: PCB Guitar Mania - Submarine vibe (EQD - The Depths clone)
Post by: duck_arse on January 26, 2023, 08:15:47 AM
to my unqualified eye, that looks like a phase shift osc based around Q1. easiest way I can think is to add a led and clr in parallel with R22. don't go silly bright - use ultra bright led w/ 22k say - and you might need to adjust R22 a value higher if the oscillator conks.

otherwise, just jamb a led in line with R22. may affect waveshape and oscillation goodness at the extremes of the rate pot.
Title: Re: PCB Guitar Mania - Submarine vibe (EQD - The Depths clone)
Post by: antonis on January 26, 2023, 08:27:26 AM
If you want to implement a fancier application..
(although, Stephen's suggestion is true, correct and verified..!!) :icon_wink:

(https://i.imgur.com/PzKfuYh.jpg)

P.S.
100nF cap is optional for LED fading (smooth blinking)..
Title: Re: PCB Guitar Mania - Submarine vibe (EQD - The Depths clone)
Post by: duck_arse on January 26, 2023, 09:07:27 AM
antonis - how is your rate indicator getting any information from the oscillator? I can't see it.
Title: Re: PCB Guitar Mania - Submarine vibe (EQD - The Depths clone)
Post by: antonis on January 26, 2023, 10:07:11 AM
Quote from: duck_arse on January 26, 2023, 09:07:27 AM
antonis - how is your rate indicator getting any information from the oscillator?

It doesn't.. :icon_wink:
(in the mean of not directly..)
Title: Re: PCB Guitar Mania - Submarine vibe (EQD - The Depths clone)
Post by: harrisxr650 on January 26, 2023, 03:59:24 PM
Quote from: antonis on January 26, 2023, 08:27:26 AM
If you want to implement a fancier application..
(although, Stephen's suggestion is true, correct and verified..!!) :icon_wink:

(https://i.imgur.com/PzKfuYh.jpg)

P.S.
100nF cap is optional for LED fading (smooth blinking)..

So you adding a small circuit for the led with an additional MPSA18 and a couple of components?

out of curiosity, can you explain how this works? i'm looking to learn a bit and not only asking around constantly :D,
Also Stephen mentioned that his way may affect waveform and oscillation goodness at some point, how about your idea?
Thanks
Title: Re: PCB Guitar Mania - Submarine vibe (EQD - The Depths clone)
Post by: anotherjim on January 26, 2023, 04:32:20 PM
I think Antonis is showing a simple level meter. Since it's a vibe, the signal level should pulsate up & down as will the LED brightness. It's a Throbometertm.
Title: Re: PCB Guitar Mania - Submarine vibe (EQD - The Depths clone)
Post by: antonis on January 26, 2023, 04:48:03 PM
Quote from: harrisxr650 on January 26, 2023, 03:59:24 PM
Stephen mentioned that his way may affect waveform and oscillation goodness at some point..

Try the LED + R22 series combination, making R22 10k (or so) to compensate for LED voltage drop.. :icon_wink:
Title: Re: PCB Guitar Mania - Submarine vibe (EQD - The Depths clone)
Post by: PRR on January 26, 2023, 10:54:24 PM
This may work. Red may be best.
(https://i.postimg.cc/z3p935DH/Submarine-RATE-42.gif) (https://postimg.cc/z3p935DH)
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