Posts Tagged ‘polarity’

Dual Polarity

Thursday, April 8th, 2010

Dual Polarity
Why an LED light is low and the other is brighter, even the same tension that runs through both?

I designed a power supply dual polarity with +5 and -5 as output, with two LED to indicate that the circuit is working, which connects with the positive and the ground is brighter than the negative and land? I am sure that both are polarized!

Measuring field trips, while the LED light up. You may have an unbalanced circuit without good ground reference. Exchange LEDs also make sure they have the same characteristics. brightness of the light being switched from the current, not voltage, so if they have a slightly different strength will be brighter.

AMATEUR RADIO STATION WB5OXQ



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Dual Polarity

Thursday, January 14th, 2010

Dual Polarity
DUAL POLARITY power supply?

can someone show me how to make a +/- 12, +/- 5 dual polarity power supply?

I can try to describe it or you can find schematics online.

A lot depends on how much current you want, I’ll guess at 1 amp each. I’d start out with a 12-0-12 VAC transformer. After 4 diodes and 2 big caps, you will have ±16 volts DC. Then use some 3 terminal regulators with heat sinks. Like LM7812 and LM7912.

If you don’t want a lot of current, you can use 5 volt regulators from the same raw ±16 volts, again, on a heat sink, or you use a different transformer, perhaps with about 8-0-8 volts secondary.

Download the data sheets for the 3 terminal regulators, and study them.

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Cubex Scorpion 88 – Dual Polarity




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