Voltage Clamp Problem ( Schottky Diode)

Discussion in 'General Electronics Chat' started by cameronhall, Jan 15, 2010.

  1. cameronhall

    Thread Starter New Member

    Jan 5, 2010
    1
    0
    Hi, I have a voltage clamp problem in the below circuit, I am getting about 1v DC at Vin where I was expecting to see 0V Both D1 and D2 are bat85 diodes. when I replace d1 with a 1n4148 the voltage at Vin is at 0V. I'm Not sure on why this is happening. Vin is a half wave that varies from 0v to 10v.
    hope some can shed some light on this for me.
    Thanks
    Cameron

    note, pic is just a EWB sim but shows my problem:


    [​IMG]
     
  2. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    The voltage you have seen is caused by the diode leakage current. If you parallel a 100K to the lower diode the voltage will reduced to insignificant.

    If 1N4148 works, just use it.
     
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