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An ordinary NAND gate will not oscillate. The circuit's oscillator must use a Schmitt trigger gate.potatoe said:Thank you for all suggestion.
To Audioguru ,I wanted to know if the NAND of this circuit(my circuit) is TTL gate ,what is happened?and if the NAND is CMOS gate(not schmitt trigger),wht is happened?
If the Cmos NAND gate's input is high then the gate will be activated and the 20k resistor will be negative feedback and its output will be at half the supply voltage.potatoe said:if the CMOS gate not oscillate,how is its result should be?
Thanks.
Because then the gate becomes a linear amplifier and the 20k resistor from its output biases its active input with negative feedback at its switching voltage that is about half the supply voltage. See my attachment for an amplifier made from a Cmos linear logic inverter.potatoe said:1.When input is high,why output is half to supply voltage ? can you make me clearly,please?
The max input current for a 74xx gate is 1.6mA and its low voltage must be less than 0.8V. A 500 ohm resistor to ground with the 1.6ma gate's input current in it has a voltage of 0.8V so the input will barely be at a logic low voltage.2.If NAND is TTL gate the output should be?