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Old 13th June 2017, 04:55 PM   #5241
prasi is offline prasi  India
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Post your Solid State pics here.
The audio stuff built by people ( be it speakers and amps) gives one joy and enormous satisfaction and is a very good pastime.
I have come to understand that learning is part of the DIY process. like "necessity is the mother of invention" equals "problems in DIY builds makes one learn the WHY?".

my opinions
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Old 15th June 2017, 04:14 PM   #5242
raffajaffa is offline raffajaffa  United Kingdom
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Default Learning something Then forgetting

Quote:
Originally Posted by diyralf View Post
Indeed, you learn something at least...
Must admit at my age and history in the hifi world I am somewhat bemused and sometimes annoyed at the testosterone filled comments or is it some times alcohol.
Sometimes these comments can be off putting to participants.
Even so I would like to thank all of the posters who contribute meaningful advice and reminders of correct procedures for best results.
I have just rewired my speakers returns back to the power board after previously redesigning the layout of my LJM L20 to surprising even small results. Simply forgot that one, when in a hurry to get it up and running,Will soon have my eyesight back to near normal and finalize the
amplifier. Still need some advice BUT ???

I am not sure the layout is at its best but it will more than do for now.
Yes it was at least 50 years ago when I first was advised about that essential design requirement.
I wonder how many glorious memnber of this forum will remember everything for that period of time.
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Old 16th June 2017, 07:40 PM   #5243
kct is offline kct  Canada
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I am glad this thread is back on track. Well in speaking of old stuff... I revived some 80's technology again awhile ago... so here are a few random pictures in no particular order of my last little project.

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Old 17th June 2017, 09:40 AM   #5244
zman01 is online now zman01  Bangladesh
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Quote:
Originally Posted by prasi View Post
The audio stuff built by people ( be it speakers and amps) gives one joy and enormous satisfaction and is a very good pastime.
I have come to understand that learning is part of the DIY process. like "necessity is the mother of invention" equals "problems in DIY builds makes one learn the WHY?".

my opinions
Well said Prasi.
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Old 18th June 2017, 04:52 PM   #5245
xrk971 is online now xrk971  United States
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Silicon Harmony - 5w into 8R and 800mW into 50R SE Class A with zero global feedback. Designed in collaboration with AKSA, layout by Prasi. Uses JFET input and BJT/MOSFET CFP output and LED controlled MOSFET CCS. Just a fit check and noise/thermal check with case. So far everything is working out very well. No noise, no hum. Heatsinks at 55C. Sweet SE harmonic profile and wonderful dynamics.

The wiring is still in need of tidying up so don't flame me. This is a fit check.
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File Type: jpg IMG_6695.jpg (445.6 KB, 286 views)
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Last edited by xrk971; 18th June 2017 at 04:58 PM.
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Old 19th June 2017, 09:04 AM   #5246
Ranchu32 is offline Ranchu32  Australia
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Interesting. How much voltage gain is produced from the common source input fet? I assume the CFP output is unity gain for better linearity.

How well controlled is the power on impulse at the speaker terminal, after the output coupling cap?

Cheers
Christian
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Old 19th June 2017, 01:26 PM   #5247
xrk971 is online now xrk971  United States
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Originally Posted by Ranchu32 View Post
Interesting. How much voltage gain is produced from the common source input fet? I assume the CFP output is unity gain for better linearity.

How well controlled is the power on impulse at the speaker terminal, after the output coupling cap?

Cheers
Christian
Hi Christian,
The voltage gain of the BF862 (20v device) is what limits the max power of the unity gain output stage. So max voltage gain is 17.7v p-p. Good question about turn-on/off impulse: there is none - a gentle start up (1 second) and slow decay over about 10 seconds on power off. I have 66mF of RCRCRC supplying power though. So no relay for turn on or off thump protection needed.
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Old 23rd June 2017, 01:46 PM   #5248
Attila I is offline Attila I  Germany
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Default my MX50SE

i did this amp a while ago for my friends desktop.
since i wanted something different for the front i decided to take corten-steel
that was bathed in bathroom-cleaner for a few hours
and then dry-cloth-polished: fantastic stains!.
the volume knob is an abused v2a doorknob.
great amp; thanks to LJM!
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Old 23rd June 2017, 01:55 PM   #5249
Attila I is offline Attila I  Germany
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Default MX50SE

more pics
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Old 23rd June 2017, 02:16 PM   #5250
dennismiller55 is online now dennismiller55  United States
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Wow. I do like the finish on the front panel.
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