9v DC to 3v DC and 1 9v DC to 2 9v's and 1 3v need some help ???

[david656]

im doing a little project and need to step down 9v DC from the wall to 3v DC... what would i use to create this effect ?

and how do i wire 2 seperate 9DC things to the same DC plug/transformer? do you do it in series or parallel or ?


any insight would be great !

thanks

[Ed_McCarron]

2 separate devices to one power supply?  Parallel.  Just be sure that the current rating on the PS will handle both devices.

9 to 3v?  http://www.dimensionengineering.com/DE-SW033.htm is a hybrid switching reg - in a 78XX footprint.  It'll handle up to 1A at 3.3v.

[Franco B]

I take it you are using a 9v DC 'plug' PSU? Why not just get a 3v one? [Here's one] from Maplins for £6.

[david656]

if i got another lead/ transformer it would just be taking up more room in a confined area :-( and therefore not reallly a option ! if worst comes to the worst im gunna have to use batteries which will run down in no time :-(


can i not use a load of resistors or summit !?

[grantspain]

what the bloody hell are you up to??

[david656]

ha ha ! its not what you think ! 

my amstrad cpc464 died and i have took it apart and re wired the tape drive to play stereo audio tapes and am planning on shuvving a windows PC maybe nano ITX or pico ITX in there BUT to get the tape drive to work with out the amstrad boards i hacked a walkman into it ! but obviously the batteries would die quick so need to DC mains power it ! and the tape motor seems to be 9v as is the other amp ! but the walkmans 3v   

[Ed_McCarron]

can i not use a load of resistors or summit !?

Sure, as long as the current drawn never changes, and you don't mind things getting hot enough to melt plastic...