Recent content by jellochaos

  1. jellochaos

    Linear's ideal diode in a full wave bridge rectifier.

    I was searching for a way to design a simple synchronous rectifier with N-ch mosfets, to avoid the voltage drop of a diode bridge. I found some interesting ideas, a little expensive though. Now I found this "ideal diode" from Linear...
  2. jellochaos

    The voltage varies under load. How can I use a Voltage comparator?

    I haven't tested it with a lower resistance but I have tested it with a higher valued one. The voltage varies with the load. The higher the resistance, the higher the voltage. But with a higher resistance there was less current flowing. So I can connect the LED diode directly to the rectifier...
  3. jellochaos

    The voltage varies under load. How can I use a Voltage comparator?

    Here is a table I made when I tested the dynamo with a 30Ω load. It's just basic measurements to aid me in the initial design. It seems that in high speeds the output doesn't change significantly. Maybe it has to do with the coil's impendance increasing as the frequency of the AC current...
  4. jellochaos

    The voltage varies under load. How can I use a Voltage comparator?

    I just found that National Semiconductors makes the LM2907 which is a frequency to voltage converter. I didn't read its datasheet extensively but I think it can be used as a switch that provides energy to a load (a relay in my case) when the input frequency is above a set level. I don't know if...
  5. jellochaos

    The voltage varies under load. How can I use a Voltage comparator?

    But wouldn't that overcharge the battery? When it's fully charged I will have to manually disconnect it. Also, a zener doesn't sound that efficient... I am planning on using the MAX712 to charge my NiMH batteries when the circuit is on the "charge" state. When the circuit is on the "Light from...
  6. jellochaos

    The voltage varies under load. How can I use a Voltage comparator?

    Hullo, I am designing my first "serious" circuit. I will use it to manage the power from a bicycle dynamo (permanent magnet generator?). I want it to switch from the dynamo to a backup battery when the output of the dynamo is not sufficient to drive a high power led and some other things. First...
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