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Hiraga "Le Monstre"
Hiraga "Le Monstre"
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Old 13th July 2019, 04:41 PM   #1701
prasi is offline prasi  India
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Hiraga "Le Monstre"
I dont have any pcb design for 30W version.
Show me the circuit.
I will make it for 30W with TO-3 devices. https://www.onsemi.com/pub/Collateral/MJ21193-D.PDF
regards
Prasi
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Old 13th July 2019, 04:54 PM   #1702
vishalk is offline vishalk  United Kingdom
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Nice music thimios!

Guys i have a concern about bias and dc offset, mine is so sensitive to adjust. I have it set at 0.6a bias but my dc offset seems to change when cold and warm, but it changes? Whats is acceptable for the dc offset? 0-10ma?

I have to add that i have 1k adjustable potentiometers so i can play with different bias settings and this seems to also affect the value of the dc offset. I could set the dc offset to 0v but when i try to adjust the bias to get it to where i want it either throws my dc offset off.
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Old 13th July 2019, 05:29 PM   #1703
gaborbela is offline gaborbela  Canada
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Quote:
Originally Posted by vishalk View Post
Nice music thimios!

Guys i have a concern about bias and dc offset, mine is so sensitive to adjust. I have it set at 0.6a bias but my dc offset seems to change when cold and warm, but it changes? Whats is acceptable for the dc offset? 0-10ma?
I had the same problem with mine, I set up the bias 0.9A at warm up (about 20 minutes from startup) but after 2-3 hours later it crawls all the way up to 1.5A.
I had a large heatsink it could handle the heat but still not normal behavior. The DC offset was fine max 25 mV movement between cold and warm.

Last edited by gaborbela; 13th July 2019 at 05:31 PM.
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Old 13th July 2019, 05:50 PM   #1704
thimios is online now thimios  Greece
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Join Date: Aug 2009
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Quote:
Originally Posted by prasi View Post
I dont have any pcb design for 30W version.
Show me the circuit.
I will make it for 30W with TO-3 devices. https://www.onsemi.com/pub/Collateral/MJ21193-D.PDF
regards
Prasi
Ok i will.
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Old 13th July 2019, 06:25 PM   #1705
thimios is online now thimios  Greece
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Location: Agrinion
I think this is the circuit.
If it possible draw for the two possibility TO247-TO-3
Best Regards.
Thimios

Last edited by thimios; 13th July 2019 at 06:28 PM.
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Old 13th July 2019, 06:37 PM   #1706
thimios is online now thimios  Greece
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Default Hiraga 8w stereo

YouTube
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Old Yesterday, 03:34 PM   #1707
thimios is online now thimios  Greece
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Join Date: Aug 2009
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After a short listening i must share my finding.
What is the used transistors.
J1=2sk246
J2=J103
T1=bc550c
T2=bc560c
T3=2sa1837
T4=2sc4793
T5=MJL3281A
T6=MJL1302A
R3=2k2//1k multi turn
R4=2k2//1k multi turn
I have test other transistor combination BUT stay away from high voltage transistors as ksa992, ksc1845 for the ccs, T1, T2.
I spend all the day trying to understand why one chanel playing so different, no bass.
Now i know... T1, T2 bc550, 560.
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Old Yesterday, 06:20 PM   #1708
DanSoare is offline DanSoare  Romania
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J103 is 2SJ103?
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Old Yesterday, 06:37 PM   #1709
thimios is online now thimios  Greece
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Quote:
Originally Posted by DanSoare View Post
J103 is 2SJ103?
Oh sorry,i will see tomorrow,now i need a rest
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