# how to connect this laser pointer to wall outlet?

R

#### Rich Grise

Jan 1, 1970
0
James said:
what kind of power converter would i need to connect 3 of these laser
pointers to a 110 volt wall outlet?
A 4.5V wall wart, probably at least 500 mA, with two additional
plugs spliced onto the cord. For the pointers themselves, a wood
block the size of the 3 batts, with metal tabs where the contacts
are. Connect these tabs to the mating connector, and figure out
a way to attach that to the package, and you're good to go.

Watch out that the voltage of the wall wart doesn't go too
high when there's only one pointer plugged into it. If worse
comes to worst, put a 5.1V at least 1W zener to limit the voltage.
(I assume the internal resistance of the supply will limit
the zener current - that's what limits it when there are pointers
plugged into it, after all.)

Have Fun!
Rich

C

#### Clint Sharp

Jan 1, 1970
0
Rich Grise said:
A 4.5V wall wart, probably at least 500 mA, with two additional
plugs spliced onto the cord. For the pointers themselves, a wood
block the size of the 3 batts, with metal tabs where the contacts
are. Connect these tabs to the mating connector, and figure out
a way to attach that to the package, and you're good to go.

Watch out that the voltage of the wall wart doesn't go too
high when there's only one pointer plugged into it. If worse
comes to worst, put a 5.1V at least 1W zener to limit the voltage.
(I assume the internal resistance of the supply will limit
the zener current - that's what limits it when there are pointers
plugged into it, after all.)

Have Fun!
Rich
Make sure the pointer has a proper laser drive circuit. Many don't and
the one referenced above looks very familiar.

J

#### James

Jan 1, 1970
0
laser drive circuit?

C

#### Clint Sharp

Jan 1, 1970
0
James said:
laser drive circuit?
A circuit that regulates the power dissipated by the laser diode by
monitoring the output from the laser diode's internal photodiode. Many
laser pointers are just a 'chip' with a bare bond wire and have no kind
of drive circuit, they are very easy to destroy with too much current.

G

#### Gary Lecomte

Jan 1, 1970
0
James said:
what kind of power converter would i need to connect 3 of these laser
pointers to a 110 volt wall outlet?

What a Rip-off Price. That laser pen in B.C. Canada, sells for $1.00 Canadian, thats about$.75 US. Also that particular product has a BAD
Failure Rate.
There is a Better brand out there that is as cheap and more relilable.

Those particular lasers only use a Series Resistor for current
regulation. Add another resistor in series of an appropriate value and
you can use any voltage adapter.

http://www3.telus.net/Projects/Projects.htm

Take care.........Gary

J

Jan 1, 1970
0

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