12 volt power supply

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12 volt power supply

Posted by: andrew ()

Date: June 26, 2003 09:25PM

parts:
U1 LM7812 +12 VDC Voltage Regulator
BR1 4 amp bridge rectifier
T1 18 volt, 2 amp ac transformer
F1 2 amp slow-blow fuse
S1 SPST toggle switch
R1 330 ohm resistor
C1 3,000 uF electrolytic capacitor, 35 volt min.
C2 100 uF electrolytic capacitor, 35 volt min.
LED1 Light Emitting Diode
MISC. fuse holder, heat sink for U1, binding posts, ac cord with plug, chassis

all resistors are 5 or 10 percent tolerance, 1/4-watt
all capacitors are 10 percent tolerance
Please operate caution when building this power supply. It is run on standard 117 ac current - and under the right circumstances 117 ac can kill you. Use a plastic enclosure if possible to decrease chances of short-circuiting. Don't use the power supply if it's wet, and never run it without the specified fuse.

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Re: 12 volt power supply

Posted by: albert wo ()

Date: December 11, 2005 11:38PM

It work also for country run on 230vac. The difference only the transformer primary side. Primary:230vac; secondary:18vac (before rectifier). The rest remain the same.

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			Home Forum!! *Robotics Projects:* Smallbot *Electronics Projects:* SMT Reflow Serial Multiplexer *Project Log:* Current Projects My Bench Equipment				Power Supplies : Reconn's World Forum Attention! If you would like to post, but don't want to create your own account, use login:guest password:rw -- Enjoy! Goto Topic: Previous•Next Goto: Forum List•Message List•New Topic•Search•Log In•Print View 12 volt power supply Posted by: andrew () Date: June 26, 2003 09:25PM parts: U1 LM7812 +12 VDC Voltage Regulator BR1 4 amp bridge rectifier T1 18 volt, 2 amp ac transformer F1 2 amp slow-blow fuse S1 SPST toggle switch R1 330 ohm resistor C1 3,000 uF electrolytic capacitor, 35 volt min. C2 100 uF electrolytic capacitor, 35 volt min. LED1 Light Emitting Diode MISC. fuse holder, heat sink for U1, binding posts, ac cord with plug, chassis all resistors are 5 or 10 percent tolerance, 1/4-watt all capacitors are 10 percent tolerance Please operate caution when building this power supply. It is run on standard 117 ac current - and under the right circumstances 117 ac can kill you. Use a plastic enclosure if possible to decrease chances of short-circuiting. Don't use the power supply if it's wet, and never run it without the specified fuse. Options: Reply•Quote Re: 12 volt power supply Posted by: albert wo () Date: December 11, 2005 11:38PM It work also for country run on 230vac. The difference only the transformer primary side. Primary:230vac; secondary:18vac (before rectifier). The rest remain the same. Options: Reply•Quote Goto: Forum List•Message List•Search•Log In Array Sorry, only registered users may post in this forum. Click here to login This forum powered by Phorum.