I didn't try it........I will however. Thanks.
No probs critter,
I hope my circuit works OK- it should.
The trouble with electronics is that schematics do not reflect what is going on in the real word: a piece of wire is an inductor and an antenna, a solder joint is a resistor, and there are small parasitic capacitances associated with all points of any circuit. This even applies to the circuit in the integrated circuit package, where, for example, the fine bonding wires are small resistors and inductors and there are substrate parasitic diodes all over the place. These parasitics would not normally cause a slow speed circuit any problems, but the OR gate you have used is very high speed and, to make matters worse, has an extremely high input impedance. By the way, these characteristics are desirable for logic gates, but they do mean that the layout is critical.
As a general rule, all unused elements in an integrated circuit package: gates, comparators, opamps, etc, must be in a defined state or they may act strangely. Once again, oscillation is possible. With logic, it is normally sufficient to connect inputs to 0V. You may think why bother, the spare elements are not connected to anything so who cares what they do. You would be right, in theory, but, in practice elements often share a common substrate: an oscillating element will take excess current from the supply line, the oscillations may couple to other used elements in the case, and it is possible for an oscillating element to destroy itself and even the complete integrated circuit.
One thing to note, is that logic gates are actually high gain, linear amplifiers over part of their input voltage range. This is also the case for comparators. This is another aspect where schematics do not tell the whole story.
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