Joyo - JF-05 Classic Chorus  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.

Re: Joyo Classic Chorus- looks like they dropped the ball!

Postby digitaltubes » 30 May 2012, 19:22

Can you confirm the BBD is a 3207? I'm wondering if the Joyo Analog Chorus is a re-layout of the Joyo Classic Chorus, with no fly wires for footswitch.
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Re: Joyo Classic Chorus- looks like they dropped the ball!

Postby Ben N » 30 May 2012, 20:22

HerrDoktor wrote:It seems more bright and it's my first chorus pedal, so I don't know, if is an issue or normal.

I thought it was a clone of BOSS CE-2 like wrote in this forum, but it seems different.
Some of you have the schematic?

I never thought of my original CE-2 as bright.
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Re: Joyo Classic Chorus- looks like they dropped the ball!

Postby HerrDoktor » 22 Aug 2012, 09:43

Hi. I bought the new analog chorus and sold the bigger one because
I had problems with the dimension of my pedalboard; the new analog chorus
is smaller than the older one.

It's absolutely better the older one; it has a warm sound and It isn't bright like I heard, but
it has a lot of hiss...

What annoying....
I've opened it to look for something.
as soon as possibile I'll post something...
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Re: Joyo Classic Chorus- looks like they dropped the ball!

Postby analogguru » 11 Nov 2012, 05:04

Joyo Classic Chorus = Ibanez CS 9 (in mono)

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Re: Joyo Classic Chorus- looks like they dropped the ball!

Postby jchristo » 09 Mar 2013, 02:07

I'm pretty sure that something is up with mine. It produces a nice chorus for a second and then the signal becomes dry after the volume fades to a marginal level (as if the effect is gated). I'm okay with dirt but I have no idea how to approach this one. Transistors? IC's?

Any input would be appreciated.
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Re: Joyo Classic Chorus- looks like they dropped the ball!

Postby jchristo » 09 Mar 2013, 03:22

jchristo wrote:I'm pretty sure that something is up with mine. It produces a nice chorus for a second and then the signal becomes dry after the volume fades to a marginal level (as if the effect is gated). I'm okay with dirt but I have no idea how to approach this one. Transistors? IC's?

Any input would be appreciated.


Uh oh. It seems I should not have posted this here. Go ahead and delete. My apologies.
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Re: Joyo - JF-05 Classic Chorus

Postby AuditoryDriving » 06 Dec 2017, 17:51

i have the same issue with hiss coming up just before a note decays.

it seems there is a noise gate implemented as an envelope follower as in ibanez cs-9 - i gathered this from Mark Hammer- which only affects the wet signal, which is the noisy part. The main suggestion floating around the web is to replace the main audio opamp. Yet, i doubt that this alone would solve the problem. So, is there anthing else that can be done to reduce the hiss without affecting the tone? in the Worst-case scenario i d lower the filter frequency thresholds and also increase the opamp low pass caps.

Thanks in advance!
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Re: Joyo - JF-05 Classic Chorus

Postby Fender3D » 06 Dec 2017, 20:27

AuditoryDriving wrote:..The main suggestion floating around the web is to replace the main audio opamp...

The main suggestion is simply idiotic...
If the noise gate really annoys you, toss the FET...
You might also bias it better to obtain another threshold limit

For this message the author Fender3D has received thanks:
AuditoryDriving (07 Dec 2017, 14:05)
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Re: Joyo - JF-05 Classic Chorus

Postby AuditoryDriving » 07 Dec 2017, 14:04

Thanks @fender3D!

it s not the noise gate per se that anooys me, it s the hiss itself. My first thought when i got it was that there was a mismatch in the pre/post emphasis filter (iirc there s no compander in there). The dry signal is noise-free,so it must be he bbd that s noisy. Surprisingly enough, there are similar complaints for the ibanez cs9, which the classic chorus seem to be a clone of.

If there are no other suggestions i ll put this on hold for a rainy day and then i ll check for the pre/post emphasis filter mismatch and in case it s right (someone maybe has checked already?) i ll lowerthe lowpass threshods in the post section.

Thanks again!

Btw, has anybody actually traced it properly to confirm if it s a part for part clone of the cs9 ? in my humble opinion, this is one of the most lush choruses i ve tried!
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Re: Joyo - JF-05 Classic Chorus

Postby Fender3D » 07 Dec 2017, 16:16

Well.. MN32xx are indeed noisier than MN30xx BBDs...
Furthermore, I don't know if Joyo is an Ibanez clone...
I just had a glimpse at CP9 schematic.

Whether they're relatives, toying with parts around IC106 should do the job...
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