Hi there all
As you can see by the diagram I have used BC547 from a 4017 to trigger a relay. (idea modified from ericgibbs drawing)
Everything works fine but what is happening is the transistor/relay are staying "on" apart from when its being pulsed by the 4017. info confirmed by multi-meter at 4017 & transistor/relay
What I want, is the transistor/relay to be on "ONLY" when the 4017 pulses.
Can anyone please tell me
1. should the transistor be moved to switch a positive voltage or
2. use a different transistor to switch a negative voltage or
3. a different transistor and moved to switch a positive voltage
many thanks
steve
As you can see by the diagram I have used BC547 from a 4017 to trigger a relay. (idea modified from ericgibbs drawing)
Everything works fine but what is happening is the transistor/relay are staying "on" apart from when its being pulsed by the 4017. info confirmed by multi-meter at 4017 & transistor/relay
What I want, is the transistor/relay to be on "ONLY" when the 4017 pulses.
Can anyone please tell me
1. should the transistor be moved to switch a positive voltage or
2. use a different transistor to switch a negative voltage or
3. a different transistor and moved to switch a positive voltage
many thanks
steve