Candle Power Flashlight Forum
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I was lucky a few months ago and got a pack of four 70W MH bulbs made by philips. Since then, I've been casting about for a decent ballast design for them.
I've read about the automotive ballast controller chips and they look great--but, I was cautioned by a fellow at philips that their bulbs do *not* like constant wattage startup like automotive bulbs can handle. Since that's a standard feature in all of the auto ballast chips that I've come across, that precludes their use.
I saw a design at Don's web site, but it's for a smaller bulb, looks a bit 'iffy', and has construction details that make me blanch. I don't like the idea of making a split core transformer with a hack saw.
Maybe something a bit more 'off the shelf'.
Does anyone have any suggetsions? I'd perfer an electronic design with a high frequency square wave output, but it looks more and more like I'm not going to find that.
Thanks!
I've read about the automotive ballast controller chips and they look great--but, I was cautioned by a fellow at philips that their bulbs do *not* like constant wattage startup like automotive bulbs can handle. Since that's a standard feature in all of the auto ballast chips that I've come across, that precludes their use.
I saw a design at Don's web site, but it's for a smaller bulb, looks a bit 'iffy', and has construction details that make me blanch. I don't like the idea of making a split core transformer with a hack saw.
Maybe something a bit more 'off the shelf'.Does anyone have any suggetsions? I'd perfer an electronic design with a high frequency square wave output, but it looks more and more like I'm not going to find that.
Thanks!
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