I did an intensive search for PCB manufacturers a few years back and JLCPCB is (was) by far the best option. Since then I have ordered multiple times from them and was never disappointed.
Just my 2cts... This is about DIY and I love the collaborative approach here and in other threads. If people want to sell their PCBs that is fine, I just do not understand why you want to talk Brian and M0rten into "business".
Please don't! Everything I do is open source. No money involved! Thank anyway for your kindness!
Haha. I might offer my PCBs on Etsy or eBay if there's interest. It's more to help the hobby than to make money.
But we're getting ahead of ourselves. We need to get a few working builds completed first to test this design out in real life. To my knowledge, @benpe has the only fully working build using my original boards.
But we're getting ahead of ourselves. We need to get a few working builds completed first to test this design out in real life. To my knowledge, @benpe has the only fully working build using my original boards.
I'll order 10 PCBs tomorrow (5 is a silly default!). I'll keep 2 for myself and 2 for my DIY friend if he is interrested (he is coming for a workshop here tomorrow, btw), the rest are yours for the asking.
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If the emitter on VAS transistor is not on the same voltage rail as the VAS base, then you're basically amplifying noise/ripple on it's power rail, which could include clipping it, creating chaos.... Remember to add the capacitor ripple to simulations.... And what happens at power up, driving that high current though the VAS transistors....
I don't know who added that noise filters, the original schematics did't have them....
Drivers negates the mosfets ciss, reducing THD at higher frequencies.... Try simulating at 20 Khz....
Feeding the VAS/Driver stage higher voltage than the output mosfets is a good thing, giving higher output power....
Hi Søren! I don't know how to comment on this, my knowledge is not up to it. Do you mean that the VAS acts as a common base amplifier for the (possible) noise that may be present at the VAS emitter?
Correct, I am watching the discussion while amplifier is gently playing.
So far no issues, DC offset is stable as rock.
I did not arrange any comparison, this particular unit is not a "contester", that is a daily amp for my son (handover early November).
Should not the Q7-Q10 placed on the pcb other way turned around to fast them to the heatsink? If I would make now a pcb then I would add SMD option for JFET-s and some SMD resistors. 2SK146 and 2SJ73 are hard to get and would be good to have a some substitute options and footprints for these JFET-s.
I find it interesting that you included a ground in J1, On the other hand someone may want a separate ground on a double screened cable. The PCB still remains one of the nicer ones I have seen.
I would say it is time to stop making changes else you will never end.
I thought the same thing. But if you think about how you insert them before bending, the footprint is correct
I think that right now the back of the mosfet is turned on inside the pcb. I can not figure out how to fasten then to the heatsink. If the back of the mosfet would be turned to the outside then I can bend it to fasten to the heatsink. Maybe someone else can confirm it?