Seatz
Newbie level 2
I just bought a sailing boat and it had all these LED ceiling lights mounted that run on 3x AAA batteries.
instead of wasting batteries and the environment i figured i would hard-wire them into the 12v battery system that's on the boat and after digging around a pile of electronics i found an little circuitry that was used to power and 3volt radio from a 12 volt powerpack.
The voltage on the boat is between 10.5 and 13.8 volt (charging/discharge batteries)
when i feed 13.4 volts on it. it gives about 3.7 volt output.
Now i like to adjust it so it will give a steady 4.5 volt output.
the circuitry on the board is pretty basic but it uses some nice components so i just want to replace one or two of them to get the 4.5 volt output.
i drew a diagram of it and it looks like this:
sorry for my bad drawing (i only had ms paint available)
is it just as easy as replacing the Z1 (zener diode) for one that is 4.5 volts?
or do i need to change the Resistor as well?
and how can you tell what kind the current Z1 is?
i had all of this in school but that's a long time ago (before LED's were easily available)
ooh i didn't measure how much current the LED's draw but they are 5 bright white LED's so i guess around 100mA total.
i have 3 of these so i like to make more of these circuits. can i make one simpler/cheaper if the LED's only draw 100mA?
Thanks in advance.
instead of wasting batteries and the environment i figured i would hard-wire them into the 12v battery system that's on the boat and after digging around a pile of electronics i found an little circuitry that was used to power and 3volt radio from a 12 volt powerpack.
The voltage on the boat is between 10.5 and 13.8 volt (charging/discharge batteries)
when i feed 13.4 volts on it. it gives about 3.7 volt output.
Now i like to adjust it so it will give a steady 4.5 volt output.
the circuitry on the board is pretty basic but it uses some nice components so i just want to replace one or two of them to get the 4.5 volt output.
i drew a diagram of it and it looks like this:
sorry for my bad drawing (i only had ms paint available)
is it just as easy as replacing the Z1 (zener diode) for one that is 4.5 volts?
or do i need to change the Resistor as well?
and how can you tell what kind the current Z1 is?
i had all of this in school but that's a long time ago (before LED's were easily available)
ooh i didn't measure how much current the LED's draw but they are 5 bright white LED's so i guess around 100mA total.
i have 3 of these so i like to make more of these circuits. can i make one simpler/cheaper if the LED's only draw 100mA?
Thanks in advance.
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