XPost: 24hoursupport.helpdesk   
   From: rf@z.invalid   
      
   "Ian Jackson"  wrote in message   
   news:RK8$DzIdHMcKFwRq@g3ohx.demon.co.uk...   
   > In message , rf   
   >  writes   
   >>Roger Dewhurst wrote:   
   >>>> You can get simple to use regulator chips that drop the voltage   
   >>>> down, you only need a couple of components to make a working voltage   
   >>>> regulator. Ask on News:sci.electronics.basic - the folk on there are   
   >>>> usually very helpful and should explain all you need.   
   >>>>   
   >>>>   
   >>> Why not just drop the voltage through a few diodes?  Very simple. Very   
   >>> cheap.   
   >>   
   >>A *few* diodes at a couple of ten cents per each. A single 7809 for less   
   >>that a $.   
   >>   
   > More like "a *few* diodes at a couple of cents per each".   
   >   
   > 3V to drop = 5 diodes @ 0.6V per diode. No other circuitry required. More   
   > than good enough for the job.   
      
   Exactly one 7809 for less than a buck. No other circutry required. Perfect   
   regulation.   
      
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