??? 07/27/04 20:24 Read: times |
#74989 - RE: Relay interface problem Responding to: ???'s previous message |
Michael Neary wrote:
------------------------------- It sounds like you have not hooked VCC of the ULN to the same 24V as your relay supply. This you must do. Sounds like your right Michael, but I said the same yesterday, only I said the 12V rail, not his 24 V rail. BTW If these are powerful 6W coil relays, the tiny diodes in a ULN2803 won't do the job - put proper fast diodes of substantial current rating NEXT TO the relays. Steve |