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