[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
<x-charset iso-8859-1>> > I work for a VW shop in Christchurch New Zealand and a couple of our owners have > > a little "black box" device that is fitted to their 6v cars (both KG's by > > chance) that allows them to run a 12v CD/cassette unit. My brother used to run his amateur mobile TX/RX from a 12V battery with transistor invertor to make the HT for the valves (vacuum tubes, as invented/improved by Lee De Forest, whose town we stopped at on the way to Parma.) It was just an astable multivibrator working at 5KHz I think, with a small step-up transformer. The switched DC worked fine with the transformer. You would need some sort of smoothing, but I assume rectification wouldn't be needed if there was no negative-going pulse. I have one of those low-power devices in the '59 Beetle, but I've not used it for ages, or looked inside. It's about half the length of an ignition coil and similar diameter; I'm sure it would be much smaller these days. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/ </x-charset>