Hiraga "Le Monstre"

[prasi]

For the small signal transistors?

Yes, he has used A992/C1845 for T1/T2/T3/T4

 

[thimios]

Great work danieljw, can you posta schematic as built?
Prasi it it according to schematic you has post?

 

[bluevas]

Hello Prasi.
The drain and source of jfet pins are inverted in your layout and schematic.

 

[danieljw]

Great work danieljw, can you posta schematic as built?
Prasi it it according to schematic you has post?

Hi Thimios,

For which Le Monstre I have built a few of them

 

[prasi]

Hello Prasi.
The drain and source of jfet pins are inverted in your layout and schematic.

Hello bluevas, Isnt source and drain reversible for JFET? I see some layout where drain is connected to trimmer pot and some layout have source connected to trimmer pot.

Hiraga "Le Monstre"

Hiraga "Le Monstre"

regards
Prasi

 

[thimios]

Hi Thimios,

For which Le Monstre I have built a few of them

Let's say for your favorite, if transistors are today available.

 

[danieljw]

The first was all original, great sound but low power.
The second was all original up to the output transistors which were Toshiba
Similar sound slightly different bias needed.
Most recent one was all original except output stage which was Onsemi.
More power on this one very clean slightly colder sound.

 

[thimios]

The first was all original, great sound but low power.
The second was all original up to the output transistors which were Toshiba
Similar sound slightly different bias needed.
Most recent one was all original except output stage which was Onsemi.
More power on this one very clean slightly colder sound.

Thanks,but where you got original now days?

 

[prasi]

Here is my version for DIY PCBS.

revised with trimmers for R3/R4.

 

[bluevas]

Hello Prasi,
I remember in some Kaneda pre/amplifier layouts the input Jfet 2SK30 are reversible. A forum member Neazoi in post #636 have an issue about changing drain source lay out.

BR,
Josh

 

[danieljw]

Thanks,but where you got original now days?

I don't know, the first was a long time ago

 

[prasi]

Though I got confirmation from 2 builders regarding JFET orientation makes no difference, here is the one with JFET drain connected to BJTs.
regards
Prasi

 

[thimios]

Prasi look a splited pcb. ha ha ha.
I haven't a big piece....
Repaired

 

[Vrystaat]

 

[prasi]

Prasi look a splited pcb. ha ha ha.
I haven't a big piece....
Repaired

Too much DIY syndrome! Be careful, it might be fatal to your transistors! next time, i will send you some bare material as an antidote.


Regards
Prasi

 

[thimios]

Too much DIY syndrome! Be careful, it might be fatal to your transistors! next time, i will send you some bare material as an antidote.


Regards
Prasi

Thank you Mr. pcb!
All the best for you!
Regards.
Thimios

 

[e_fortier]

Though I got confirmation from 2 builders regarding JFET orientation makes no difference, here is the one with JFET drain connected to BJTs.
regards
Prasi

Hi Prasi

This is the way I usually see the jfet being connected.

Looks like double sided pcb. Is it possible to get the Gerber for this latest edition? I haven’t verified the pcb but I like what you did ! Pls check, there is a red line inside R7.

Maybe I’ll run a small batch, it’s been a while I haven’t send one to PCBway.

Best regards
Eric

 

[prasi]

Hi Prasi

This is the way I usually see the jfet being connected.

Looks like double sided pcb. Is it possible to get the Gerber for this latest edition? I haven’t verified the pcb but I like what you did ! Pls check, there is a red line inside R7.

Maybe I’ll run a small batch, it’s been a while I haven’t send one to PCBway.

Best regards
Eric

Hi Eric,
Sure , will share the pdf and gerbers here. The redline indicates that Input ground is to be connected to PSU ground, which is already mentioned on the PCB, so no problems there.

If you have placed many orders with PCBWAY, then you must have accumulated lot of 'beans' . Those can be en-cashed for gift PCBs and projects on their site. Do check out for cool little PCBs and projects!

regards
Prasi

 

[prasi]

Hello guys,
here are the pdfs and gerbers.
Regards
Prasi

 

[kenev]

Hi prasi,
Thank you for sharing your PCB design.
What is a suitable software for using the Gerber files?