Quote:
Originally Posted by Trigon.
There are chips available but they cost a few pounds, e.g. the LTC6995, which is a 6 pin surface mount device which doesn't require a timing capacitor. (Useful to keep within your 4mm height limit !)
e.g. from the data sheet - a 1 hour auto shutoff timer (which would also need a fet or transistor to invert the output) :
Attachment 191708
Cheers |
Thank you Chris, but I think the LTC chip type is the chip to try, or I wonder if there is a similar chip that did not need the output inverting. The PCB may have to be 12mm X 12mm x 4mm H which would be possible using LTC6995.
John.