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Old 5th January 2013, 08:40 PM   #341
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Quote:
Originally Posted by tinitus View Post
what is different from the Pass BA-3 frontend ?
looking at schematics I see only minor difernces
I really can't figure out why this is a poweramp, and the BA-3 only a gain/driver stage

btw, some time ago I worked hard to find good TO-220 devices for the F5
maybe some of them could be good ?
or is it all down to these special Toshiba devices ?
And where do you discover the similarity? Same transistor types?

Last edited by permaneder; 5th January 2013 at 08:44 PM.
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Old 5th January 2013, 09:47 PM   #342
juma is offline juma  Germany
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Quote:
Originally Posted by tinitus View Post
what is different from the Pass BA-3 frontend ? ...
Everything... Much smaller gain of the input stage, highly degenerated output stage which is also very low biased, absence of feedback loop which makes the circuit a transconductance amp...
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Old 19th January 2013, 09:40 AM   #343
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Just for fun, here is a little pcb for your amp. Each five MOSFETs allow either lower bias and higher supply voltage rails for more power@8Ohms or more power@4Ohms with 400mA bias (total 2A per rail) and +-20V supplies.
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Old 19th January 2013, 10:53 AM   #344
Telstar is offline Telstar  Italy
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Just for fun, here is a little pcb for your amp.
sweet!
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Old 20th January 2013, 09:54 AM   #345
nik.d is offline nik.d  Serbia
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Just for fun, here is a little pcb for your amp.
me likes to!
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Old 20th January 2013, 01:20 PM   #346
Rush is offline Rush  United States
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Originally Posted by permaneder View Post
Just for fun, here is a little pcb for your amp. Each five MOSFETs allow either lower bias and higher supply voltage rails for more power@8Ohms or more power@4Ohms with 400mA bias (total 2A per rail) and +-20V supplies.
Nice looking board. What are the dimensions? Output device spacing?
Have you tested the board, any errors?

Rush
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Old 20th January 2013, 06:43 PM   #347
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290mm*46mm. Not tested, but absolutely free of errors. It is just a finger exercise.
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Old 18th February 2013, 04:42 AM   #348
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Cool !

Si.
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Old 18th February 2013, 07:19 AM   #349
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I would order boards of Juma's F5, if there is sufficient interest. The price per set depends on the number of ordered boards. From ten or more sets on we we can expect reasonable costs.
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Old 18th February 2013, 07:25 AM   #350
zoe is offline zoe  United States
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I would order at lest one set!
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