Stabilnih 12V iz auto akumulatora za mali potrošač lcd

[kratki spoj]

Pozdrav, imam lcd termometar koji spajam u auto na 12V gdje napon malo prelazi 14V, ovakvog je tipa: http://p.lefux.com/61/20091123/A0427000" onclick="window.open(this.href);return false; ... Sensor.jpg

7812 mi nije dobar izbor, da li mogu spojiti 3 diode 1N4007 u seriju koje mi ruse svaka po 0.7V?

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[Programer15]

zasto nije dobar izbor 7812

[kratki spoj]

7812 treba barem 2.5V vise da bi peglao na 12V, a imam i jacu muziku u autu pa bih htio napraviti prednaponsku zastitu, a da nije 7812. Bio bih zadovoljan da imam od 11-12V, nesto u tom rasponu.

[Programer15]

kako ti se cini ovo!!!

A simple 12 volts voltage regulator that can be used to supply your electronic devices from your car can be constructed using few common components . This 12 volts car adapter circuit use a 12.7 volts zenner diode but maybe you can’t find a 12,7 volts zenner , so in that case you can use a 12 v or 13 volts zenner diode . If you will use a 12 volts zenner you will need to stick in another diode like 1N4001 (in this case the output voltage will be a little under 12 ) and if you will use a 13 volts zenner the output voltage will be around 12.3 volts .

The 2N3055 transistor must be mounted on a heatsink .

Code: Select all

http://www.electroniq.net/files/surse/12V-car-regulator.jpg

[kratki spoj]

Ovo će mi svakako poslužiti!

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