Author Topic: 2015 Smoothie - not enough phase  (Read 393 times)

Zerro

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Re: 2015 Smoothie - not enough phase
« Reply #15 on: July 16, 2021, 07:38:58 AM »
Great! So 4V7 zener gives 4,3V with current consumption. Now, if you have a some more patience, I shoul try here zener 5V1. Little higher voltage at center bias doesn't harm. Try this and we will see. If nothing happens, you should little lower that R19 - 3M9, at cca 3M3 or 2M7. Every j-fet has slightly another thrashold for good functionality. But, maybe that with those 2 phase stages you can't await something more. So, try those tricks, fiddle about bias trimmer, and refer us about. Here are some more tricks, we can still try.
« Last Edit: July 16, 2021, 08:18:06 AM by Zerro »
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jimilee

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Re: 2015 Smoothie - not enough phase
« Reply #16 on: July 16, 2021, 08:04:25 AM »
Yep, the phase 45 is exact half of a phase 90. It’s very subtle at its deepest.


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Zerro

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Re: 2015 Smoothie - not enough phase
« Reply #17 on: July 16, 2021, 08:22:31 AM »
For distorted guitar it would be enough, to hear. Something like wah pedal with low resonancy. Very soft phasing with fuzz or similar fx.
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danfrank

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Re: 2015 Smoothie - not enough phase
« Reply #18 on: July 26, 2021, 05:46:13 PM »
My 2˘ worth:

I had a pair of fets that were matched down to 0.003 volt and used them in the Smoothie and the effect is pretty pronounced for a two stage phaser. JimiLee is correct, it's a fairly subtle phaser but if you have a bunch of fets to get a really tight matched pair, that will help. Also, the trimmer to bias the fets is super sensitive. A 10 turn trimmer will help get the best biasing

jimilee

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Re: 2015 Smoothie - not enough phase
« Reply #19 on: July 26, 2021, 05:49:01 PM »
My 2˘ worth:

I had a pair of fets that were matched down to 0.003 volt and used them in the Smoothie and the effect is pretty pronounced for a two stage phaser. JimiLee is correct, it's a fairly subtle phaser but if you have a bunch of fets to get a really tight matched pair, that will help. Also, the trimmer to bias the fets is super sensitive. A 10 turn trimmer will help get the best biasing
Truth. I put j201s in the last phaser I built. Works really well. I’ve never heard of a 10 turn trimmer. Sounds handy though.


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danfrank

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Re: 2015 Smoothie - not enough phase
« Reply #20 on: July 26, 2021, 05:59:13 PM »
These are actually 3 turn but better than a single turn. Mouser has actual 10 turn trimmers

jimilee

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Re: 2015 Smoothie - not enough phase
« Reply #21 on: July 26, 2021, 06:36:57 PM »
These are actually 3 turn but better than a single turn. Mouser has actual 10 turn trimmers

Gotcha, thanks.
Pedal building is like the opposite of sex.  All the fun stuff happens before you get in the box.