This circuit uses unusual Motorola components. The circuit was suggested in the 1990 Linear Databook. Transistors can be replaced with equivalents.
In fact, this 1992 circuit consists of a demonstration circuit of a 5-channel remote control that...
In the figure we have the configuration of a transistor as a temperature sensor. The circuit is...
The transistors in this 80's documentation project may be BC548, the most modern equivalents of...