Modify Daves Soft latch power switch to require longer buttonpressing.

• Modify Daves Soft latch power switch to require longer buttonpressing.
  Posted by ulfpe on 19 Apr, 2016 12:47
• Hello, I need a soft latch power switch, I found Daves excellent circuit.
  I need to modify it a bit, I would like the button to be pressed about 3 seconds before the mosfet turn on and pressing about 2 seconds  will shut it down.
  How do I modify it to have this functionality?
  
  
• #1 Reply
  Posted by veryevil on 19 Apr, 2016 16:33
• My first guess would be adding a large value cap to the base of the NPN transistor which the 100k Pull up on the other side of the switch will charge?
  
  EDIT: Seems to work - See Spice Attached. Added 10u Cap and modded 100k to 1Meg

  ---

  Soft Latch With Start-Up.asc
• #2 Reply
  Posted by ulfpe on 28 Apr, 2016 11:19
• Thanks!