Use a regulator with an enable pin. The LM317 doesn't have one.
Or put a transistor in front of the LM317 to cut off the 12V.
davivid I think Your wiring is a bit wrong, it should be like this.Thanks Erni, I have now amended my circuit.
Is this better because your not running the high the current through the transistor, and therefore can use a cheaper cooler running component?
I am interested in knowing the reasons for the design.
Unfortunately I am unable to test until Monday, when I can get hold of the additional parts.
Also I am confused about which part sets the the LM317 - I thought it was a resistor 1.8, between ADJ and OUT, but here its quite different!
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16