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Old 2nd February 2013, 05:03 AM   #1071
Junie is offline Junie  Philippines
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which version of PCB you use? Post some pics.
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Old 4th February 2013, 06:11 AM   #1072
ahmadfay is offline ahmadfay  Indonesia
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with this one...
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Old 4th February 2013, 01:30 PM   #1073
mj777 is offline mj777  Australia
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@ahmadfay,those are nonpolar capacitor
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Old 5th February 2013, 12:31 AM   #1074
ahmadfay is offline ahmadfay  Indonesia
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alright.
though with great difficulty I have got it. but I still can not set up the bias voltage, so that the final transistor gets hot, but I have a bias vr turn to the right and left. is there someone who can help me?
thanks
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Old 5th February 2013, 01:01 AM   #1075
Arif Budiyanto is offline Arif Budiyanto  Indonesia
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Hi Mas Ahmadfay...
As a common I set bias by measure v across R 0.33 Ohm. Set bias low first, let it run for couple days. When your amp survive then raise the the bias...Please always check the HS temperature...
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Old 5th February 2013, 03:27 AM   #1076
ahmadfay is offline ahmadfay  Indonesia
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ok Mas Arif, tak coba-e
this is brilliant idea,
thanks
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Old 8th February 2013, 12:44 AM   #1077
marestiani is offline marestiani  Indonesia
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I just made ​​SR50 and the sound is great, but the BF's transistor are quite hot when turned on for 5 minutes, is this normal or is there something wrong with the circuit that I created, help me please newbie here
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Old 8th February 2013, 11:20 AM   #1078
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by marestiani View Post
I just made ​​SR50 and the sound is great, but the BF's transistor are quite hot when turned on for 5 minutes, is this normal or is there something wrong with the circuit that I created, help me please newbie here
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Nice work, BF's must be hot, what is your rail voltage and what pcb design you use?
Regards
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Old 8th February 2013, 11:53 AM   #1079
marestiani is offline marestiani  Indonesia
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Originally Posted by apexaudio View Post
Nice work, BF's must be hot, what is your rail voltage and what pcb design you use?
Regards
Thank you sir apex, i use 35Vdc rail voltage with 10A fake transformer the final transistor used A1943 - C5200 Grade II (only these sell in local store nearest my home) but the temperature not to hot and one more question if i use TL071 what do i have to change to the board? so hard find LF411 in here only got 5pcs last week, i used pcb design in attachment, thanks for sharing a good knowledge n schematic, this is my first build next i will build B500
Regard
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File Type: jpg sr50new.JPG (558.9 KB, 971 views)

Last edited by marestiani; 8th February 2013 at 12:21 PM.
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Old 8th February 2013, 12:41 PM   #1080
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by marestiani View Post
Thank you sir apex, i use 35Vdc rail voltage with 10A fake transformer the final transistor used A1943 - C5200 Grade II (only these sell in local store nearest my home) but the temperature not to hot and one more question if i use TL071 what do i have to change to the board? so hard find LF411 in here only got 5pcs last week, i used pcb design in attachment, thanks for sharing a good knowledge n schematic, this is my first build next i will build B500
Regard
You can use TL071 instead LF411 without any changes.
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