Quote:
Originally Posted by Karls48
- Hi Craig. Daryl (Kokatha man) is correct in his explanations about usage of rechargeable batteries to power your mount. Except this “Regulator devices (IC chips) can be placed across the battery outlet to supply the mount lead and plug. These are simple, inexpensive and small devices that will provide good protection for the mount. (available at Jaycar etc) “
- The common regulator IC from Jacar or DS is LM7812. It will not work in this application, as it needs about 6Volts difference between input and output. Which you simply don’t have on 13.8V battery.
- There are Low Dropout Voltage regulators available that require only about 0.5 Volt difference between input and the output. Still they are not really feasible to use to regulate voltage from 13.8V battery to 12V unless you are going to use very large capacity battery. Problem is that your mount will most likely operate quite happily on 11V from battery without any regulator; but it will shut down at 12.5V of battery voltage with the regulator attached. Therefore considerably shortening the time that the battery cans power the mount.
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Thanks for that Karl - I should mention 2 things here: I haven't used any
*, or looked at a Jaycar or any other retail catalogue re VR's for quite some time viz specifics; and the suggestion of using said device was meant to be considered as an adjunct to a poorly regulated charger left across the battery.
*In fact, the last time I used VR's in this sort of situation would have been over 20 years ago! I was faced with an unregulated DC supply - one of the ancient 4-blade Dunlite wind generators, the so-called 750W units, that could wind up to way over 40 odd volts, and that even with 500 aH cells, resulted in nearly 42 volts at the terminals, even under loads.
The user wanted to run his sound system turntable (at the time a quite reasonable one) from a 32V - 240V invertor (square wave, and depending on voltage applied, variable output frequency!) and as the winds rose and abated, his turntable accelerated and slowed down in sync, creating interesting vinyls!
With stuff-all to work with I used the particular VR I had with me across the DC supply and, problem solved - that poor little fella was working at the extremes of its' limitations (or beyond) but when I came through that way again some 3 years later, there it was, still keeping this audiophile's system functioning fine!!!
Cheers, Darryl.