aliraza786
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This is intentionally for the 50% duty cycle circuit, figure 14 in the National datasheet. However, the datasheet also says:pins 6 and 7 are connected to the resistors reversed
In the present circuit, RB is about 0.5 RA, so considering a threshold tolerance, it won't necessarily work.Note that this circuit will not oscillate if RB is greater than 1/2 RA because the junction of RA and RB cannot bring pin 2
down to 1/3 VCC and trigger the lower comparator.
Personally, I prefer a more simple 50% circuit with a single timing resistor feedback from output pin to pin 2/6.
Alex i join the circuit like in the link but still no output........