Hi all-
I am designing a fairly complicated switching circuit where I need the functionality of an AND gate but am not too keen on using them. I am using mom pushbuttons to control CMOS logic. The logic outputs will drive a darlington (so as not to draw so much current) which will switch a relay bank. There are some instances where I need "relay a" to switch if "bank a" is on and that option is called, and "relay b" if "bank b" is on, etc.
AND gates would do this but another much simpler way of doing this would be to stack my driver transistors (which I would need anyhow, with or without the AND gate) one on top of each other. Using the above example, the bottom BJT would turn the relay bank on or off and the top bjt would control the optional relays. This way both transistors need to be on for the option to turn on.
Is there any problems or considerations to do this? Any easier way?
Thanks in advance!
I am designing a fairly complicated switching circuit where I need the functionality of an AND gate but am not too keen on using them. I am using mom pushbuttons to control CMOS logic. The logic outputs will drive a darlington (so as not to draw so much current) which will switch a relay bank. There are some instances where I need "relay a" to switch if "bank a" is on and that option is called, and "relay b" if "bank b" is on, etc.
AND gates would do this but another much simpler way of doing this would be to stack my driver transistors (which I would need anyhow, with or without the AND gate) one on top of each other. Using the above example, the bottom BJT would turn the relay bank on or off and the top bjt would control the optional relays. This way both transistors need to be on for the option to turn on.
Is there any problems or considerations to do this? Any easier way?
Thanks in advance!