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Old 24th October 2010, 08:42 PM   #101
Tea-Bag is offline Tea-Bag  United States
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I have it on the plate to build one, and replace the P-channel IRFP9160's with the 2SJ313 in some other devices.
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Old 29th October 2010, 02:30 PM   #102
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Hi.I admire this design but i want to say something,is it not better to use seperated power supply for input stage?Maybe with a very good regulated power supply?Thanks
BR Umit
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Old 29th October 2010, 02:44 PM   #103
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Originally Posted by umut1001 View Post
Hi.I admire this design but i want to say something,is it not better to use seperated power supply for input stage?Maybe with a very good regulated power supply?Thanks
BR Umit
You are 54th guy who asks the same question about F5 and the answer is still the same: no, it's not a clever thing to do - use the search button and find out why
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Old 29th October 2010, 03:42 PM   #104
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What I said :

F5 Listening Impressions & Discussion

And what NP said :

F5 Listening Impressions & Discussion


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Old 29th October 2010, 05:28 PM   #105
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Which for me means that it's only worthwhile if done very well. Possibly using two regulated supplies - a simple one for output and something really nice for the input. There might also be an issue of an output switch-on/off transient if the supplies have different time constants.
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Old 29th October 2010, 05:39 PM   #106
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Listen to what Nelson said.
I was trying to be polite.

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Old 29th October 2010, 05:49 PM   #107
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Originally Posted by analog_sa View Post
Which for me means that it's only worthwhile if done very well. Possibly using two regulated supplies - a simple one for output and something really nice for the input. There might also be an issue of an output switch-on/off transient if the supplies have different time constants.
nope nope nope

ppoint is - for upper part of circ - positive rail is base for biasing and modulating the output mosfet

same for lower part of circ - negative rail is base for bias and modulating the output mosfet

include any series element between mosfet and adjacent modulating source ( adjacent jfet) , you'll induce who knows what

there is simply no benefit but only harm , trying to separate supply paths between jfet and mosfet

if you want anything regulated - try with entire PSU , either real reg , or "just" cap multiplier

wanna proof ?

mount additional steering wheel in your car , right in front of passenger seat ;

connect it with real steering wheel with soft rubber band ; then say to your passenger to lay hands on it and do exactly in time whatever you do with steering wheel ; observe .

then replace soft rubber band with firm chain and repeat operation ; observe



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Old 29th October 2010, 05:55 PM   #108
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I will use BC114 25v 47000uf(very low esr/esl) capacitors in my new F5 amp.Maybe a 24vx2 battery will be good for input stage?
feel free to try it

then go back , in all glory ...... and say your findings
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Old 29th October 2010, 05:56 PM   #109
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I did not see your message and write it i deleted a min ago
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Old 29th October 2010, 05:57 PM   #110
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feel free to try it

.......
or should I say - feel free to fry it ?

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