Good day,
I tested the 9XB module with the following IC: NE555, 3*SN74LS90N and SN74F04N.
In the appropriate position of the commutator i can see with the oscilloscope a signal on the pin nr.1 of SN74F04N. The NE555 works. And i also have output at pin 12 of SN74F04N coming from this NE555. In all other positions of the commutator the LED is turned off and there is no signal at SN74F04N nor on the pins of the SN74LS90N. None of them have signal on the pin no.12. Any idea why?
Note how i'am holding the IC in my hand. The pins seem a bit oxidized. That's how i bought them.
Also i had to modify the pcb abit by drilling a small hole in it and fixing the 1k resistor from the pin 7 of NE555 to pins 2 and 6 and then connecting a 10nF capacitor to ground.
I tested the 9XB module with the following IC: NE555, 3*SN74LS90N and SN74F04N.
In the appropriate position of the commutator i can see with the oscilloscope a signal on the pin nr.1 of SN74F04N. The NE555 works. And i also have output at pin 12 of SN74F04N coming from this NE555. In all other positions of the commutator the LED is turned off and there is no signal at SN74F04N nor on the pins of the SN74LS90N. None of them have signal on the pin no.12. Any idea why?
Note how i'am holding the IC in my hand. The pins seem a bit oxidized. That's how i bought them.
Also i had to modify the pcb abit by drilling a small hole in it and fixing the 1k resistor from the pin 7 of NE555 to pins 2 and 6 and then connecting a 10nF capacitor to ground.
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