greetings to all elec. techs.
im a bit of a nerd with things electrical. very limited understanding
could some one dispel my doubts a bit?

1 im making a device that requires about 12v and rather than buy a power
adaptor---i just use my laptop adaptor
output 19.5v 3.9a with a round tube-like jack
is it just a matter of buying the femail jack and soldering my 2 wires
from the hho cell to the femail part---are there specific pos and neg
on the femail jack?
and can i put a rheostat on the wire to control the amount of volts
im putting into the cell? would it damage my adaptor in any way?
also i want to put an on off switch along the powerline

2 also i will buy a small high pressure aquarium air pump with an
attatched power plug i can put directly into the mains
sometimes i might not want full high pressure air coming out
if i use a rheostat ---would it harm the pumps engine? should
it be a special kind of power controller?

any advice appreciated

 

1. What type of battery? Voltage? charging current?

2. A small AC speed controller like this one

 

are you planning to use the aquarium pump to compress the hho gas? most aquarium pumps have either pounts that spark, or brushed that also spark. hho and sparks can be a problem and go BOOM. and ac works much better for generating hho gas, it dosnt plate the electrodes like dc does.

 

1. What type of battery? Voltage? charging current?

2. A small AC speed controller like this one

the speed controller---yes, its a voltage regulator. so would you advise me to get
that instead of a common rheostat?

there are no batteries involved in my project. the 12 volts i think i will need
must come from mains power. the power adapter i will be using puts out 19 volts
and i want to safetly reduce it (output) to 12v

 

Oh, this is one of those HHO projects? You know, where you put in Kwh, $, and get out nothing....

 

the speed controller---yes, its a voltage regulator. so would you advise me to get
that instead of a common rheostat?

Yes! A rheostat is a poor solution for controlling any significant amount of power. They're great for controlling small amounts of power as information. So a typical circuit uses a small, cheap, low power potentiometer to control a power-handling circuit. The high-current or high-power path does not pass through the potentiometer.

Why? Because a potentiometer that can handle more than a few watts is very expensive.

 

Oh, this is one of those HHO projects? You know, where you put in Kwh, $, and get out nothing....

its a secret project. classified---forum rules prevent me from describing it. thats ok with me

 

Yes! A rheostat is a poor solution for controlling any significant amount of power. They're great for controlling small amounts of power as information. So a typical circuit uses a small, cheap, low power potentiometer to control a power-handling circuit. The high-current or high-power path does not pass through the potentiometer.

Why? Because a potentiometer that can handle more than a few watts is very expensive.

thanks for that. i ll get a speed controller-voltage regulator.
been here just a short time and got a lot of good info already. the post about
pumping gas using electrical devices could have done me a lot of damage