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  1. boombar

    460V DC to 400V DC How?

    I need to lower voltage from 460V DC (sometimes goes even to 470V) to 400V DC. Need to supply up to 1A max. It's probably possible to achieve that with some zeners and a transistor... is it?
  2. boombar

    7106 resistance-meter auto-on howo

    Anybody know how to make ICL7106 based resistance-meter turn on automaticaly when resistance is connected and go off when resistace is removed. Something like stand-by. It's auto ranging meter with two ranges: 0-19 Ohm and 20-2000 Ohm. Measuring current must be lower than 1mA. Right now works...
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