Re: Reducing Source Voltage To Power Supply

On Thu, 10 Jan 2008 05:51:50 -0800 (PST), "Dave.H"
<the1930s@xxxxxxxxxxxxxx> wrote:

I'm building a power supply for an 8 transistor radio, that originally
used 6 "D" cells, involving a rectifier bridge, filtering caps etc,
but there's on problem,which is I can't seem to find an AC transformer
outputting 6 volts that fits in the case I want to use. I have no
problem using a wall wart, but I can't find one of the correct
voltage. I have one rated at 9 VAC, outputting in the range of
12.5-13 VAC. Is there a way to halve this voltage with resistors
without generating too much heat?

---
You may want to consider something like one of these:

http://www.tamuracorp.com/clientuploads/pdfs/pg5.pdf

which you can get from Digi-Key.


In any case, how much current does the radio draw and what current
is your wall-wart rated for when it's outputting 9V?


--
JF
.

Relevant Pages

  • Reducing Source Voltage To Power Supply
    ... used 6 "D" cells, involving a rectifier bridge, filtering caps etc, ... outputting 6 volts that fits in the case I want to use. ... 12.5-13 VAC. ... Is there a way to halve this voltage with resistors ...
    (sci.electronics.basics)
  • Re: Reducing Source Voltage To Power Supply
    ... outputting 6 volts that fits in the case I want to use. ... Is there a way to halve this voltage with resistors ... is a variable regulator, in which the voltage is set by a voltage divider on ... BTW, your 9VAC transformer is just right for your device, which is 9VDC. ...
    (sci.electronics.basics)
  • Re: Reducing Source Voltage To Power Supply
    ... but I can't find one of the correct voltage. ... I have one rated at 9 VAC, outputting in the range of 12.5-13 VAC. ... Need to learn how to apply control theory in your embedded system? ... "Applied Control Theory for Embedded Systems" by Tim Wescott ...
    (sci.electronics.basics)
  • Re: Reducing Source Voltage To Power Supply
    ... outputting 6 volts that fits in the case I want to use. ... 12.5-13 VAC. ... Is there a way to halve this voltage with resistors ... BTW, your 9VAC transformer is just right for your device, which is 9VDC. ...
    (sci.electronics.basics)
  • Re: Reducing Source Voltage To Power Supply
    ... used 6 "D" cells, involving a rectifier bridge, filtering caps etc, ... outputting 6 volts that fits in the case I want to use. ...  Is there a way to halve this voltage with resistors ... I just checked Radio Shack's web site. ...
    (sci.electronics.basics)
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