Catamaransite
catamaran, catamaran for sale, Cruising catamaran for sale by owner, sailing catamarans
catamaran, catamarans, Cruising catamaran for sale by owner, sailing catamarans for sale

Affordable Cruising Catamarans

catamaran, catamarans, Cruising catamaran for sale by owner, sailing catamarans for sale

There are times when batteries in electronics are a pain in the butt, as they go dead at the most inconvenient times. Since a boat has a 12V battery bank and since our electronic gizmos run on a somewhat lower voltage, I thought a voltage regulator circuit was in order to have my boat battery bank run my electronics. There are a 100 voltage regulator circuits but I found that the least expensive solution was using a common 7805 fixed voltage regulator found at Radio Shack, it is possible to design a custom voltage output regulator for $2.00 which is current limited to slightly more than 1 amp. Most of the time, that's all we require.

This regulator is desirable if you have a bunch of battery operated devices which accept an external power source. You can eliminate all your batteries as you can design any voltage you like between 5-10vdc as an output.

regulatorThe base Formula for modifying the cheap regulator is
Vout = V(designed)\(1 + R2/R1) + (Iq * R2)
So, for a common 7805 fixed 5 volt regulator
Vout =5(1 + R2/R1) + (Iq * R2)
Where Iq = .0042 (4.2 ma) and you experiment with the values of R1 and R2

 

This design is inexpensive and works just fine but you do need a heat sink for the 7805.

An Example: For a regulated output of 9.35v

package

Vout= 5(1+1000/33000)+(.0042*1000)
 
Use the following components
C1 .33uf
C2 0.1uf
R1 33000 ohm
R2/VR1 1000 ohm
 
 
 
 
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