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Old 2nd March 2011, 04:42 PM   #31
44250 is offline 44250  Serbia
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Quote:
Originally Posted by apexaudio View Post
Regulated PSU for power amplifiers. Output voltage can be set and stabilised from +/-55 to+/-90V 10Amax.
I see many similarities between PSU-10 and PSU-5,the differences are in voltage of zener-diodes,and parallel connections of the output transistors,also in input and output voltage. I donīt need that high output voltage as it in PSU-10,so PSU-5 is something that I would really like to built for myself ( I need adjustable power supply,to test all kind of amplifiers),but it hasnīt got enough power for my needs due to transistorīs low power limit. Could I add a pair of output transistors to PSU-5 (as it is in PSU-10) without other changes being made,in order to get higher current and power capabilities?

Last edited by 44250; 2nd March 2011 at 05:02 PM. Reason: bad gramatics
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Old 2nd March 2011, 05:18 PM   #32
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Originally Posted by 44250 View Post
I see many similarities between PSU-10 and PSU-5,the differences are in voltage of zener-diodes,and parallel connections of the output transistors,also in input and output voltage. I donīt need that high output voltage as it in PSU-10,so PSU-5 is something that I would really like to built for myself ( I need adjustable power supply,to test all kind of amplifiers),but it hasnīt got enough power for my needs due to transistorīs low power limit. Could I add a pair of output transistors to PSU-5 (as it is in PSU-10) without other changes being made,in order to get higher current and power capabilities?
It's same schematics, just add a pair of outputs transistors to PSU-5 for 10A, and with low zener and input voltage this PSU can be use for class A amps like Hiraga.
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Old 2nd March 2011, 05:40 PM   #33
44250 is offline 44250  Serbia
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Well than thatīs great! That is something I will built soon,thanks for sharing all this with us!
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Old 7th March 2011, 03:17 PM   #34
MiiB is online now MiiB  Denmark
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The j-fet...are they complemtary...N and P channels for the posetive and negative part of the supply...
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Old 7th March 2011, 08:32 PM   #35
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Originally Posted by MiiB View Post
The j-fet...are they complemtary...N and P channels for the posetive and negative part of the supply...
No, all FETs are for CCS, and it's all N-fets BF245A.
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Old 8th May 2011, 10:13 PM   #36
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Originally Posted by viktor1986 View Post
Nice work Nikko!

3 x 1N4148 can be replased with the red led diode(Vf = 1.8V).

What is the voltage at the output when you turn on power supply and how much is after 10 minutes?
Yes, but LED need higher current than 1N4148 for Vref.
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Old 12th August 2011, 07:57 AM   #37
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Dear Sir Mile, I have some problems in assembling the APEX-made power supply,
1. relay is not functioning at the time ON of the transformer is connected to AC 220V
2. I have a transformer 5 Ampere, 30V CT. Can I replace a few components that the module power supply is working perfectly ?
Please help Mr. Mile
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Last edited by DAMANHURI; 12th August 2011 at 08:02 AM.
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Old 27th December 2011, 09:32 AM   #38
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Quote:
Originally Posted by DAMANHURI View Post
Dear Sir Mile, I have some problems in assembling the APEX-made power supply,
1. relay is not functioning at the time ON of the transformer is connected to AC 220V
2. I have a transformer 5 Ampere, 30V CT. Can I replace a few components that the module power supply is working perfectly ?
Please help Mr. Mile
Replace 1k8/5W with 330R/2W
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Old 27th December 2011, 05:28 PM   #39
tome is offline tome  Macedonia
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Hi Mile
Do you have any regulated psu boards for sell (for power amp 10A and pre amp)
Puno hvala
tome
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Old 15th January 2012, 11:25 AM   #40
44250 is offline 44250  Serbia
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Originally Posted by tome View Post
Hi Mile
Do you have any regulated psu boards for sell (for power amp 10A and pre amp)
Puno hvala
tome
With some playing in "paint" it is easy to do. I will try to do it now... I did a mixture of a PSU5 and PSU10-using 12V zener(like in PSU5) and two pairs of 2SA/2SC transistors(like in PSU10) wich were connected to the board with wires as short as i could connect. Now it looks like this,and when i reach some inspiration and time,i will do it with new PCB. Anyway,there is one thing i must say:i have tested this PSU10,or should i say tortured it with 10A on each rail for one minute. 2x42VAC 450VA torus transformer was quite warmed up,uotput voltage dropped on 2x45VDC (due to transformer voltage drop) but the heatsink and output transistors not only survived it-they were slightly warm! Great thing!
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Last edited by 44250; 15th January 2012 at 11:28 AM.
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