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  1. PeterG

    0-30 Vdc Stabilized Power Supply

    Hi all, I need your help. What hfe should the BC548 (or BC547) and the BC557 (or BC327) have? A search in this thread didn't turn up any hits, which I find surprising. Hasn't anyone else wondered whether a BC548A, BC548B or BC548C is the right one? Or doesn't that matter? Thanks, Peter
  2. PeterG

    Led display Digital Voltmeter question

    Dang. I've written quite a lengthy reply, but when I clicked on send, the forum said I wasn't logged in and my posting was gone. Never click on send before pressing Ctrl+A, Ctrl+C. I should've learned that by now. :( I'll repeat the most important part only: -------------------- Thanks for...
  3. PeterG

    Led display Digital Voltmeter question

    Hi all, I've just finished my DVM (with 7805/7905 power supply) and for a minute, it worked well (zero reading with no input voltage, correct reading with input voltage). Good! :) Then I've fiddled around with the wires and, for some reason beyond me, the DVM ceased to work. Now it keeps...
  4. PeterG

    Free sample chips!

    How come that Sensirion is in that list? They sell expensive sensors only of which you can't order samples. Would be too nice to be true.
  5. PeterG

    Frequency generator to shut off street lights.

    Hi. I'd point a bright focused flash light to the sensor and see if it shuts the light off. If it does, the sensor isn't UV-only-sensitive (and I don't think it is). Of course, you'd still have to figure out how to trigger the sensor on an every night basis. But are you sure that you can take...
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