This crystal oscillator generates a 20 MHz signal. Equivalent transistors such as BF494 and 2N2222 can be used. The stabilizing diodes can be 1N4148.
In this circuit, a light-sensitive SCR or Light Activated SCR determines the operation of an...
This divider by 8 is synchronized because it is implemented based on TTL or CMOS logic according to the...
We found this circuit in a 2002 documentation. As it uses still common CMOS integrated circuits, it can...