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Old 27th April 2013, 05:11 PM   #11
istvan is offline istvan  Hungary
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This new PCB looks much better, than previous one. What about soud? What is your impression? Who else try it? A/B tests or other comparison as reference?
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Old 29th April 2013, 05:51 PM   #12
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by istvan View Post
This new PCB looks much better, than previous one.
Definitely.
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Old 29th April 2013, 06:52 PM   #13
istvan is offline istvan  Hungary
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Quote:
Originally Posted by southernoise View Post
What transformer VA rating should I use for this kit?
How largr the Heatsink? Thanks.
The transformer should be 20W, and the dissipation/chanels mosfets (Q3&Q6, respectively Q8&Q11) is approx 3W/chanel.
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Old 19th August 2013, 03:38 PM   #14
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by istvan View Post
The transformer should be 20W, and the dissipation/chanels mosfets (Q3&Q6, respectively Q8&Q11) is approx 3W/chanel.

AC24V voltage is more important
OR AC12-0-12 Series connection
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Old 29th August 2013, 06:42 AM   #15
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hi Ljm , now u learned good English languish, times changes man.
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Old 28th February 2014, 12:40 PM   #16
xslavic is offline xslavic  Moldova
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should we bypass r19,r34 with 170uF capacitor ?
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Old 28th February 2014, 04:45 PM   #17
00940 is online now 00940  Belgium
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It really isn't a good idea to use 16V rated caps at the output. If the top mosfet fails open... Good practice for output caps is to use at least a voltage rating equal to the unregulated rail.
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Old 18th March 2014, 09:05 AM   #18
xslavic is offline xslavic  Moldova
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shouldnt R16 R31 be removed ? it will form RC filter with headphone impedance -and you cant compensate for cable capacitance this way.
i also used line filter as no filtering device after 7824 ,next time use a low noise transistor please +1 irf610 wont be much of an expense
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Old 18th March 2014, 11:55 PM   #19
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Fifty bucks including a case on fleabay. If I can find a cheap enough xformer I might just give it a go..
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Old 14th May 2014, 03:46 PM   #20
xslavic is offline xslavic  Moldova
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another LJM pcb that doesnt work
can you please post schematics for last version of hapro irf610 classA
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