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rajabi
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Posts posted by rajabi
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The original project has many errors so it does not work properly and it is not reliable. therefore we fixed it in this thread and in another thread in the forum.
If the positive unregulated supply from your 24V transformer is 32VDC and the output to the load is 5V then the output transistors have 27V across them. If the load current is 1A then each of your two output transistors dissipates 13W so they will need a pretty big finned heatsink to get rid of that much heat.
The 24V transformer voltage is too high for the opamps in the original project. The 35V transformer is also too high for the opamps in our fixed circuit.
Thank you a lot for your answer
It is so difficult for me to find the final version of your project in this thread and in another thread in the forum because my English is too weak and it take so mach time therefor if it is possible give me the final version of circuit or link me in to it.
about the 35V transformer can I use some Zener diode for limit op amps IC to solve the problem and how can I do it
best regards
thanks again for your kind attention and corporation -
Hi friends:
Thank so mach for your powerful site
I build this power supply http://www.electronics-lab.com/projects/power/001/index.html
so I try to upgrade the amps of it so I change the 2N3055 to two BUX98 Transistor and parallel them as you know it need to put a small and big resistance in emitter of those transistor so I put 0.27 ohm 5W for each of them and change input bridge diodes to 35A bridge but when I take just 1 amps continuously the heat-sink getting hot.
I know I am never good designer so I need strongly your help to fix my problem, can you arrange your project for my two BUX98 Transistor and I must told you I check this power supply circuit with 5A adjustable transformer that I put it to 24V as your circuit is needed but I have 35V 5A Transformer that can give us 5A continuously.
Can you arrange your circuit with this Transformer too.
sorry for every things
Best Regards
0-30V Stabilized Power Supply
in Projects Q/A
Posted
hello
thanks a lot for your answer as soon as possible but I can not found the op-amp IC you mention in your new circuit. Do you know any other IC's that I can put in the new circuit?
About the 35V Transformer except of 28V Transformer it is Important for me because I most pay money again for new transformer and it is a little bit difficult...
Best Regards