Roland JC-120 Jazz Chorus Amp Clone

[joensd]

Cool design. Bet it sounds lovely with the jfet front-end.

Let me say though that I would´t recommend +-40V for the LM3886 at all.
Absolute maximum Ratings are +-42V with an Input Signal and the power Dissipation even with 8Ohm Speakers will go through the Roof when pushed a Little.
(see Graphs in the datasheet).
Don´t even think about connecting a 4Ohms Speaker to a LM3886 powered with +-40V. If you´re lucky the device will switch off before max. Junction temperature is reached.

 

[john65b]

Yes, but just to clarify - the Original JC-120 amp was dual rail 40v, and was not an LM3886 implementation.

My Clone amp - the one in this posting - is an LM3886 for the amp side, with the actual cloned Preamp, and was more like 30vdc dual rail.

 

[joensd]

Thanks for clearing this up.

 

[pop4richard]

If you are going to clone the JC120, make it lighter.

 

[john65b]

Service Manual for the JC-120 with full schematics....

 

[Chuyrock99]

The amp is dual rail 40volts, the preamp single rail 27 volts

Thanks again¡¡

 

[balu1234]

Hi @john65b,

I'm interested in one of the PCBs, but I live in Europe. I still have a couple of 2sk117s that are looking for a new project. Would you mind sharing the PCB files?

Kind Regards

 

[john65b]

I have one more PCB I can send out. PM your address. Thanks

 

[bOTL]

I have one more PCB I can send out. PM your address. Thanks

Hello I would like the PCB will PM address

 

[john65b]

OK. All PCBs spoken for...may do another run....

 

[bOTL]

Received PCB toady Thank You.
Donated to the site.
Sending you a PM

 

[john65b]

Good deal. Let me know how it works out...

 

[mystyrjenkins]

I would like to buy one of these if you still have one, the boards, or a pre assembled unit would be best.

 

[john65b]

I have the complete amp as shown in original posting...

 

[metalosophy]

Hello, I am interested in a few pcbs! Would like to make one for me and friend, maybe two! Great project and I appreciate your hard work, look forward to paying you for some PCB's if you do a run.

 

[john65b]

Currently out of boards but looking into getting more...I will have to get back to you...

 

[metalosophy]

I look forward to it!

 

[cocoamousse]

OK. All PCBs spoken for...may do another run....

Great work ! Thanks for providing the pcb's ! I'll be super interested in few of those if you do another run. Have a nice one

 

[bureau13]

OK. All PCBs spoken for...may do another run....

I'm late to this party, but if and when you do another run of PCBs I am interested in one.

Thanks...

 

[john65b]

Let me see what I can do....