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Title: +/- dual adjustable power supply help Post by: MAXPAYNE on September 18, 2007, 06:37:40 06:37 I have found a ckt diagram for adjustable dual power supply at http://sound.westhost.com/project44.htm
but i didn't found the lm337 ic in the market. Is there any alternative or any other ckt diagram for at least 1A output u know? Please help! Thanks in advance :( :( Title: Re: +/- dual adjustable power supply help Post by: bbarney on September 18, 2007, 07:10:28 07:10 I don't think you looked very hard ;D
http://search.digikey.com/scripts/DkSearch/dksus.dll http://www.futurlec.com/cgi-bin/search/search.cgi http://uk.farnell.com/jsp/search/browse.jsp?N=411+1000108&Ntk=gensearch_001&Ntt=lm337&Ntx= Title: Re: +/- dual adjustable power supply help Post by: ipek on September 18, 2007, 11:44:17 11:44 www.fairchildsemi.com
RC4194 Title: Re: +/- dual adjustable power supply help Post by: MAXPAYNE on September 18, 2007, 12:40:22 12:40 I don't have any opprtunity to do transaction on internet and have to rely only on the local market for elec parts.
Please help me with alternative or another diagram. Crying need for my lab power supply....... :( :( :( Title: Re: +/- dual adjustable power supply help Post by: bbarney on September 18, 2007, 06:23:56 18:23 your local supplier should be able to order the parts as it's a common as part as they get
Title: Re: +/- dual adjustable power supply help Post by: MAXPAYNE on September 19, 2007, 05:19:38 05:19 I already checked them. They didn't...... :-\ :-\
Title: Re: +/- dual adjustable power supply help Post by: rf151 on December 16, 2007, 01:52:45 13:52 u can use lm317 and lm137/237/337 with together for doual adjustable power supply or use 7805 and 7905 with together with a knob potansiometer between GND pin and ground.
but your minimum voltage limit in +/_ 5.( lm317/lm337 limit is 1.2 volt) . u can find the circuit in 7805 datasheet. Title: Re: +/- dual adjustable power supply help Post by: titi on December 16, 2007, 04:32:07 16:32 Hello,
if your transformer has two insulated winding on the secondary, you can make 2 positives power supply with LM317, you need 1 diodes bridges more. you connect le + of the second power supply to the gnd of the first one and you have symetrical power supply. Here a small drawing to explain that on attachement. Bye. Title: Re: +/- dual adjustable power supply help Post by: Trishool on December 17, 2007, 08:36:09 08:36 I have found a ckt diagram for adjustable dual power supply at http://sound.westhost.com/project44.htm but i didn't found the lm337 ic in the market. Is there any alternative or any other ckt diagram for at least 1A output u know? Please help! Thanks in advance :( :( MAXPAYNE , The regulator LM337 is very reliable type , Alternative would be 555 timer type ckts to generate -ve supply , but not reliable at all. Ts Ts |