This circuit is from 1999 documentation. The integrated circuit used is not very common today. Both transistors are used if the motor current is greater than 500 mA.
We found this circuit in an American 80's documentation. The resistors must be of high precision...
The circuit shown is a Pierce type oscillator and operates at the fundamental frequency of the...
In the circuit shown in the figure we have the way to excite a small speaker from a TTL output. The...