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Old 26th August 2003, 09:49 PM   #1
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Question simple PSU Question..

wanna build a PS. for a small amp. which runs at about 12v.
(11-14v. range), with a max. current consumption of 5A

ive one trans. 12v. rated at 10A, a 6A bridge and as much
capacitance as needed..
how to achieve agood regulation? ,volt. regulators above 1.5A
arent available in here, so can i just use a 12v. zener diode??!
or maybe theres better solutions?

thanks all..
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Old 27th August 2003, 10:14 AM   #2
sss is offline sss  Israel
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Click the image to open in full size.


well thats a simple voltage regulator that u can make for your needs
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Old 27th August 2003, 11:08 AM   #3
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Old 27th August 2003, 11:41 AM   #4
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I`ll take it is an automotive amp....for one thing they do not need a regulated supply there is one built in.

all this amp wants to see is a voltage source between 11-17 vdc and enough amperage available from the source

I would rectify and filter your power supply and thats all that is needed


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Old 27th August 2003, 11:41 AM   #5
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stupid geocities server
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Old 27th August 2003, 11:46 AM   #6
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This circuit should Work for you!
The value of C2 is dependent on your input voltage
and should be preferebly more than your input Voltage
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Old 27th August 2003, 12:02 PM   #7
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hi Marvellous
your circuit is transistors Vbe depanded ,Vout will be lower at higher currents , but its better them my circuit for deepangers application
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Old 27th August 2003, 06:43 PM   #8
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Quote:
Originally posted by Marvellous
This circuit should Work for you!
The value of C2 is dependent on your input voltage
and should be preferebly more than your input Voltage

aah, u mean to use one of those lm7812 volt. regulators for ex.
combined with a 12v. 10A passing transistor..

so any recommendations about the transistor??
and what about the filtering capacitance?
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Old 28th August 2003, 07:16 AM   #9
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Quote:
so any recommendations about the transistor??
and what about the filtering capacitance?
The transistor Vce should be 12V or more
Ic should be 5A or more

Capacitance can be Higher than 2200uf if you wish!
but the input capacitor should have a higher voltage rating than your input voltage! just to be safe!


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Old 28th August 2003, 07:48 AM   #10
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Quote:
Originally posted by deepanger



aah, u mean to use one of those lm7812 volt. regulators for ex.
combined with a 12v. 10A passing transistor..

so any recommendations about the transistor??
and what about the filtering capacitance?

I recommend to connect one diode in series with pin #2 of the 7812. With this modification You can get 12V output egzactly. The series pass device can be any high power NPN device, such as TIP35/BD249/MJ15024 etc.

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