Guest h3rman Posted March 31, 2013 Report Share Posted March 31, 2013 I made a circuit (the finished circuit is going to have many more "contacts") that is supposed to replace a bunch of relays.Question no 1 - Does this work for the N.O function?Question no 2 - How can i make an N.C. function? (I cannot use the 60 VDC as power supply. The N.C function must be working when there is no input voltage, and do to the place where the circuit is going to be i cannot use a separate power line or ground. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted April 3, 2013 Report Share Posted April 3, 2013 The NC function generally needs a permanently live powersupply but there are ways round it.The simplest way is to is to use a depletion mode power MOSFET or a JUGFET driving a BJT being driven by a small pulse transformer.Another trick involves using a small battery to bias a transistor on and use an opto-coupler to turn it off. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.