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Old 27th June 2010, 11:39 AM   #21
juma is offline juma  Germany
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Just killing time while you rush to build that amp
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Old 27th June 2010, 04:43 PM   #22
Zen Mod is offline Zen Mod  Serbia
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who cares for amps

Mighty ZM is exploring these dayz ....... timeless pleasures

look - no left , no right .... just deep down ....... right through the mono
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Old 27th June 2010, 05:52 PM   #23
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....... right through the mono
When a pair of speakers are used for mono, it creates the most realistic imaging I've ever heard. The artist just pops into thin air between the speakers--hard to believe that we can't get a good, modern, mono recording.

To create stereo effects takes excellent engineering, which I'm not certain is abundant. Of course, it could be that I'm being lazy--I have to build two amplifiers to have stereo.
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Old 27th June 2010, 10:03 PM   #24
juma is offline juma  Germany
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Quote:
Originally Posted by Zen Mod View Post
who cares for amps

Mighty ZM is exploring these dayz ....... timeless pleasures

look - no left , no right .... just deep down ....... right through the mono
Great!
There is even bettter recording from 1912, half-mono !
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Old 27th June 2010, 10:33 PM   #25
Magura is offline Magura  Denmark
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I think this calls for a BBQ pic!


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Old 27th June 2010, 11:07 PM   #26
Zen Mod is offline Zen Mod  Serbia
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Off Topic Mob in action ....... again
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Old 28th June 2010, 12:06 AM   #27
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Off Topic Mob in action ....... again
AAAaaaiiiiiiiiiiiiiieeeeeeeeeeeeaaaaaaaahhhhhhhh!! !!!!!!!!!
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Old 28th June 2010, 11:19 AM   #28
Vix is offline Vix  Yugoslavia
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Old 2nd April 2013, 07:46 PM   #29
Zen Mod is offline Zen Mod  Serbia
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Default for Buzz & Stajo ....... and Stajo & Buzz

so , I'm dumb

while , few years ago , I was contemplating about these amps I knew that servo is clever thing to have for iteration with CCS loading on top , I didn't realize that for split load choke one doesn't need servo , at least not for having same DC potential on two outputs

(so - it isn't new that I'm dumb , it also isn't new that I know that ..... and what's new is that I realized what's written above )

reason is so obvious that I don't need to explain it

however - potential mismatch between two output mosfets (Jfets , whatever) can lead to unequal current through two halves ...... and you know that chokes are not humble but humable , when put in that position

in practice , one need to use matched mosfets ( preferably at 2A , where Iq is set ) and any further tweak regarding L-R Iq is easily achieved with small trimpot in source of input Jfet , on more current hungry side

note number 13 - you both know that , irrelevant which part is used here ( IRFP , SJEP , SJDP , cascoded LU - all of them easily adopted with just FB net change ) , max power is in range of , say , 15W/8R

that figure coming from Iq of 2+2A , and load of 8R , which is , in fact , more like 4+4 - at least concerning each half of amp

so , I'm expecting that this thingie is gonna work , maybe without or just little polishing

now , I need to implement some of things simmed here , to Magura's Donuts - to slightly change lower CCS arrangement , just because he was either lazy to implement some NTC correction circ in , or it was absolutely impossible , taking in account that difference in temp between full temp and Dodo of his amps is some 5(five) C

pics are result od LTSpice sim , so usual disclaimer - that's sim ........ and - even more important - sim by Mighty ZM

edit - both pics are for 1W output
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File Type: jpg Choke-Donut-no-servo.jpg (55.5 KB, 203 views)
File Type: jpg Choke-Donut-no-servo-FFT.jpg (56.0 KB, 203 views)
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Last edited by Zen Mod; 2nd April 2013 at 07:52 PM.
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Old 2nd April 2013, 08:48 PM   #30
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