Project: 240v reciprocating saw circuit urgent help required please!

Discussion in 'Homework Help' started by HarrisonRedwood, Feb 9, 2016.

  1. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Post the circuit, what component is actually failing?
    Max.
     
  2. HarrisonRedwood

    Thread Starter New Member

    Feb 9, 2016
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    0
    Here is one of the circuits I have made. I have no idea weather it's correct as I am a beginner in this electronics. The problem is that it just isn't working at all.
    upload_2016-2-11_20-52-53.png
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    18,690
    5,796
    No series limiting resistor for the LED for one?
    Max.
     
  4. HarrisonRedwood

    Thread Starter New Member

    Feb 9, 2016
    16
    0
    Cheers I'll add that in, here is another one that kind of works but I cannot seem to get the time to last for more than a fraction of a second.
     
  5. HarrisonRedwood

    Thread Starter New Member

    Feb 9, 2016
    16
    0
    I seem to have fixed that issue but the next issue is that the electrolytic capacity discharges incredibly slowly once the time is up, how can this be resolved so that it discharges quicker or instantly.
     
  6. Alec_t

    Expert

    Sep 17, 2013
    10,114
    2,467
    In the circuit in post #24 the cap charges slowly and discharges quickly. If you want to slow the discharge, insert a resistor in series between the cap and pin 7.
     
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