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**Jan H** · 03-18-2008, 04:01 PM

what about an alternating current?

hair clippers and doorbells work on this principle.

**bugler** · 03-18-2008, 05:14 PM

Thanks for answering.

I need a frequency around 1hz (between 0.5-3hz).

Can I change the frequency of AC?

Thanks.

**lighty** · 03-19-2008, 12:53 AM

@Bugler

Google for H-Bridge. It can be done with relays or MOSFETs.

**bugler** · 03-22-2008, 10:02 AM

Thanks.

I found this site: Using the H-bridge - H-bridge Tutorial

It seems I have to use a micro controller.

Does anyone know a micro controller kit to create and run the program in the micro controller?

**lighty** · 03-22-2008, 01:38 PM

You don't need MCU. The only thing you have to watch out for is the simultaneous switch On of the elements in the same vertical arrangement (you would get a true short circuit which could cause some damage to the circuitry. So you have to introduce delay circuit.

For the fast solution I would use a Flip-Flop to provide me with two phase opposed signals and then use H-Bridge Driver IC. Or even better yet you can omit Flip-flop part if a H-Bridge driver IC has advanced enough logic. In the past I used one of the HIP408x series (don't remember which one) and I think TD340 to drive high power MOSFETs and to control rotation of the motor with currents over 40A. However most of the semiconductor manufacturers have at least one H-Bridge driver in their offer so, google for H-Bridge Driver and good luck.

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off-topic. I need to switch polariti to a coil

off-topic. I need to switch polariti to a coil

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