Stochino's amp

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#3
I can appreciate why you are looking for PCB,s for the Stochino mosfet amplifier , I was quite impressed with it in EW at the time ,he later made amendments to it so make sure its his latest design.


It requires exact connections due to its high speed and is not an amplifier that can be "made up quickly " without the correct PCB,s and components as oscillation will easily take place.


If you are deviating from the circuit /components be very sure it will not cause instability , power up using a variac .


Well worth doing though.
 
#6
Gerbers for the Stochino amp have been published by fmmech_24 in the "Giovanni Stochino's ultra fast amp" thread, post #66 on 21/02/2018. It's not the Stochino original but has some nice extras like provision for higher power mosfets, such as the IRFP240/9240 as well as the originals. I haven't had any boards made and fmmech_24 didn't say whether he had either, but the gerbers look good when examined with gerbv. I'd be interested to know how you get on if anyone has these pcbs made. I can reverse engineer a schematic and BOM if anyone does go ahead. Or maybe fmmech_24 can help out if he's still around.
 
#10
SumanDachepalli said:
Hi, Here is the gerber attachment from the "Giovanni Stochino's ultra fast amp" attached, not sure if they are also prone to oscillations, Probably DIY gurus can correct me.
Click to expand...


Suman you have quoted me wrongly .


I said quite rightly that if somebody is building Stonchini,s design then they better take their time and use PCB,s that Stonchini himself approves of .


The designs by Stochini need to be built to a high standard , none of this --"lash it together to see if it works " .


Its high speed slew rate and raised some controversy on EW , he himself made a point of this in his articles .


If somebody is building an amplifier--not to his specification then the onus is on the person who is RE-designing it --NOT on Stonchini .


Stochini,s amplifiers are good but need great care in the LAYOUT as he himself said if the design is to achieve the specifications and stability the HE recommended.


I did NOT say his design is basically unstable that is putting words into my mouth but his designs are not for somebody starting out in audio amplifier building.
 
#11
Guess I put it wrong, I apologize.


I didnt meant to say his design is oscillating. I just mean to ask if somebody can help me who has build it thinking that the proven build can eliminate hiccups.



But with your inputs, looks like I need to have good hands-on before trying this.



I will be following this thread and will try build it one day.


Thanks,
 
#12
The fmmech_24 pcb design looks pretty good to me, its much more compact than Stochino's original. The main differences between this and the original are that the regulators for the front end are on the main pcb and there is provision for the higher powered output mosfets. The front end regulators are of the series pass zener/transistor type rather than the three terminal integrated parts of the original. Other than that the pcb is designed pretty much for the original parts. Can't see this is likely to affect amp stability if done properly. That said, Stochino did say that pcb layout was critical for getting optimal performance. It would be good to hear from fmmech_24 if he's still around; failing that someone needs to get the pcbs manufactured to see if they're any good. Not too much money down the drain if not.
 
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