I'm looking at the datasheet / Application Notes for the 558 Quad Timer.
Specifically, Figure 5.a Monostable Operation (One Shot)
I want to drive a LED with the output. I see from the notes on data sheet that the out pin is, "Note: 3 The NE558 output structure is open-collector, which requires a pull up resistor to Vcc to sink current. The output is normally LOW sinking current."
I have connected the -ve side of the LED to OUTPUT A, pin 1 on the 558, the LED +tive side connects to Vcc via a 220ohm resistor. Is my output correctly configured?
From TIMING A pin 2, I have a 10M ohm resistor connected to Vcc and a 0.01uF capacitor between pin 2 and gnd. I'm looking for an on time of 0.1sec for the LED.
Is my timing correctly configured?
Lastly the TRIGGER A, pin 3. I'm using a SPST Normally Open push button wires as follows. One side of the push button is connected to gnd. The other is connected to pin 3. Pin 3 is also connected to Vcc via a 10k ohm resistor (Pull Up Resistor). Is my trigger correctly configured?
Pin 5 is connected to Vcc and pin 12 to gnd.
When powered up the LED remained off regardless of the state of the button. As well the chip quickly became very hot. Fortunately, i have two spare 558 chips. Any assistance would be greatly appreciated.