How to build a 1,5V power supply???

[E Draisma]

Hi there,

For an art project I need to build a small 1,5V power supply to power a
small MP3 player. (replace a 1,5V AA battery)
Available is 8-10V DC.

I know a little bit about electronics, enough to build a simple schematic.
However, I can't find a schematic to do this; maybe anyone of you knows how
to do it?

I would be very pleased if anyone could help me!

Eibert Draisma.

 

[Costas Vlachos]

"E Draisma" <draisma1@xs4all.nl> wrote in message
news:3f49e866$0$49098$e4fe514c@news.xs4all.nl...

Hi there,

For an art project I need to build a small 1,5V power supply to power a
small MP3 player. (replace a 1,5V AA battery)
Available is 8-10V DC.

I know a little bit about electronics, enough to build a simple schematic.
However, I can't find a schematic to do this; maybe anyone of you knows
how
to do it?

I would be very pleased if anyone could help me!

Eibert Draisma.

How about this (quick 'n' dirty)?

.. ___ Imax
.. 8-10V o-------|___|------o------>-----o ~1.4V
.. R |
.. |
.. |
.. V 1N4001
.. -
.. |
.. |
.. V 1N4001
.. -
.. |
.. |
.. ===
.. GND

Should work with a battery-powered device such as your MP3 player. The value
of R depends on the player's maximum current demand, Imax. Use the equation:

R = 5V / Imax

where 5V is the voltage drop across R caused by Imax alone. This will keep
the diodes on when I <= Imax, so as to maintain about 1.4V across them.
Values higher than 1 kOhm may result is output voltages of less than 1.4V.

Not the best solution in terms of regulation, but easy to build and should
work for this application.

cheers,
Costas

 

[robin.pain@tesco.net]

"Costas Vlachos" <c-X-vlachos@hot-X-mail.com> wrote in message news:<bicusc$2vq$1@titan.btinternet.com>...

"E Draisma" <draisma1@xs4all.nl> wrote in message
news:3f49e866$0$49098$e4fe514c@news.xs4all.nl...
Hi there,

For an art project I need to build a small 1,5V power supply to power a
small MP3 player. (replace a 1,5V AA battery)
Available is 8-10V DC.

snip
Eibert Draisma.



How about this (quick 'n' dirty)?

. ___ Imax
. 8-10V o-------|___|------o------>-----o ~1.4V
. R |
. |
. |
. V 1N4001
. -
. |
. |
. V 1N4001
. -
. |
. |
. ===
. GND

snip
Costas

You could replace the resistor with an filament bulb. This would
convert some of the energy to light and reduce the heat. It would also
tend to series-regulate because its resistance increases the hotter it
gets i.e. the more current you try to draw.

Robin

 

[Wayne]

It really only uses a single 1.5v battery?



"E Draisma" <draisma1@xs4all.nl> wrote in message
news:3f49e866$0$49098$e4fe514c@news.xs4all.nl...

Hi there,

For an art project I need to build a small 1,5V power supply to power a
small MP3 player. (replace a 1,5V AA battery)
Available is 8-10V DC.

I know a little bit about electronics, enough to build a simple schematic.
However, I can't find a schematic to do this; maybe anyone of you knows
how
to do it?

I would be very pleased if anyone could help me!

Eibert Draisma.

 

[sine]

It looks like a FET transistor, is it ?