This circuit was obtained in an American documentation from the 80's. The transistors can be equivalent to those indicated and the crystal can reach a few tens of megahertz.
Found in old documentation, this circuit is the receiver for the previous circuit. Components are...
We found this circuit in the 1994 Linear Applications Handbook by National Semiconductor. The...
This circuit switches the capacitors of a digital filter with the 4046 IC (PLL). The circuit was...