This circuit is from Motorola's 1990 Linear Databook. The transistors allow equivalents and the output power depends on the supply voltage. The power supply must be 30 V symmetrical.
This circuit is from an American manual from 1975. The transistors are types of the time, but...
We obtained this circuit in a 1977 technical documentation. The basic component is an integrated...
This circuit that generates a special sound was found in a Popular Electronics from the 90s. The...