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I have this circuit that "AND's" a bunch of switches together to then NAND's that to a final Solenoid. The input switchs also power on and off solenoids as well as act as inputs to the MC14082 chips.
The problem is that the input switches cause some kind of bounce that cause the output...
Thanks! It looks like what I've done, except for tying the other NAND to ground, and adding the capacitors...and it looks like the gate resistors.
Which do you think is frying my chips? Or maybe not fried if I tie the unused gate? i'll check tomorrow.
Thanks again. I've attached my circuit diagram. The chips keep breaking, even if I don't have anything hooked to the output of the 4012.
Again, any help is appreciated.
RE No untied inputs. I assume this is only on one quad of the two quad input 4012 chip. I'm pulling all inputs low through 47k resistors, but one quad input I'm not using at all.
I've disconnected the MOSFET and just measure the output of one of the quad input NAND gates. Doing this, a new...
Thanks guys.
continuing:
I switched to driving the IRL520 MOSFET. This works great. Solenoid engages when all inputs to the 4012 are tied to 12 volts.
Problem is, the NAND gate is burning out (or something?) After a short time, pulling the inputs high (to 12vdc which is what VDD to the...
Thanks! I ordered up some IRL520PBF MOSFET's looks like they can sink a lot, but on retrospect, it looks like they only have an input of +-10 volts, which is a problem as I'm running 12VDC through the 4012's. Do you think this will work, or burn out? Do I need a resistor between the ouput...
So I have a 4013 NAND trying to pull a solenoid. I think what happened is I pulled too much current from the output? My inexperience with transistors.
I need to pull a 12 volt solenoid with a 28 ohm cable. I think this means I need 12/28=428 ma of current. So I chose a transistor 2N3053...
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