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

E

#### E Draisma

Jan 1, 1970
0
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.

C

#### Costas Vlachos

Jan 1, 1970
0
E Draisma said:
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.

.. ___ 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

R

#### [email protected]

Jan 1, 1970
0
Costas Vlachos said:

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

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

W

#### Wayne

Jan 1, 1970
0
It really only uses a single 1.5v battery?

S

#### sine

Jan 1, 1970
0
It looks like a FET transistor, is it ?