Hello Everybody,
I build this crystal oscillator circuit like the diagram below. When I use IC HD74HC04 of Hitachi Semiconductor or 74HC04 of NXP semiconductor (formerly Philips semiconductor). It works well. But when I use SN74HC04 of Texas Instruments. It does not work ! Could anyone give me any suggestion ? Thanks.
![](https://i209.photobucket.com/albums/bb100/joeypc2005/Crystal%20Oscillator%2012MHz.jpg)
I build this crystal oscillator circuit like the diagram below. When I use IC HD74HC04 of Hitachi Semiconductor or 74HC04 of NXP semiconductor (formerly Philips semiconductor). It works well. But when I use SN74HC04 of Texas Instruments. It does not work ! Could anyone give me any suggestion ? Thanks.
![](https://i209.photobucket.com/albums/bb100/joeypc2005/Crystal%20Oscillator%2012MHz.jpg)