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Old 25th May 2012, 04:47 PM   #1
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Question 7905 bypass current

how to make a 7905 regulator circuit with an current bypass transistor????
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Old 25th May 2012, 07:56 PM   #2
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Data sheet has circuit and how to calculate R values.

jan didden
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File Type: jpg high current reg.jpg (12.6 KB, 84 views)
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Old 26th May 2012, 03:25 AM   #3
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sorry if I am wrong, the circuit bypass current regulator for 78xx ..
Can it be used on 79xx?
What type of transistor that can be used on 79xx regulator?pnp like that or npn?!?
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Old 26th May 2012, 12:06 PM   #4
AndrewT is offline AndrewT  Scotland
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Look up the 7905 datasheet.
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Old 29th May 2012, 03:00 AM   #5
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Try this link::
...
Type 78XX Power Regulators
...
Here is another one (shows a 7812/7912 - but theory is the same):
...
Type 7812and 7912 Type Power Regulators
..
Dave
Phoenix, AZ
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Old 29th May 2012, 06:22 AM   #6
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Quote:
Originally Posted by herryawan View Post
sorry if I am wrong, the circuit bypass current regulator for 78xx ..
Can it be used on 79xx?
What type of transistor that can be used on 79xx regulator?pnp like that or npn?!?
Of course. Use a complementary transistor. Trace the current and you'll see. You really should at least understand the working of a transistor when trying to build this.
And make sure that capacitors are the right polarity.

jan didden
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