hello.
Thanks to members on this forum, I have been able to build two little circuits and individually they work great, but I found that when I try and join them together they conflict.
in the picture attached, Circuit 1 takes a low voltage trigger signal and through use of the transistor it opens up the higher level 9v psu signal. Circuit 1 transistor opens and closes the connection of the - negative terminal, so with this circuit positive is always present on the main output. which causes a problem for circuit 2.
The second circuit is designed to light up a bulb when there is 'no' power present on the input; and then turns off the bulb when there 'is' power present on the input.
The problem is that whether the trigger circuit 1 is on or off ,it always has positive present at the terminals, so the second circuit responds to that and is always in the off position.
i wonder is there a way to have the trigger circuit 1 open and close positive instead of negative? Or perhaps circuit 2 could respond to the open and closing of the negative from circuit 1?
the diagram i made does not have regulators or relays as it just looked so messy. so i've simplified it a bit to aid explanation.
i hope someone can help.
thanks again : )
Thanks to members on this forum, I have been able to build two little circuits and individually they work great, but I found that when I try and join them together they conflict.
in the picture attached, Circuit 1 takes a low voltage trigger signal and through use of the transistor it opens up the higher level 9v psu signal. Circuit 1 transistor opens and closes the connection of the - negative terminal, so with this circuit positive is always present on the main output. which causes a problem for circuit 2.
The second circuit is designed to light up a bulb when there is 'no' power present on the input; and then turns off the bulb when there 'is' power present on the input.
The problem is that whether the trigger circuit 1 is on or off ,it always has positive present at the terminals, so the second circuit responds to that and is always in the off position.
i wonder is there a way to have the trigger circuit 1 open and close positive instead of negative? Or perhaps circuit 2 could respond to the open and closing of the negative from circuit 1?
the diagram i made does not have regulators or relays as it just looked so messy. so i've simplified it a bit to aid explanation.
i hope someone can help.
thanks again : )
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