This circuit was obtained in a Motorola documentation from 1968. The circuit uses a power transistor of the time. Modern equivalents according to the load current and voltage can be used.
This simple transmitter for the AM range was found in a Popular Electronics magazine from March...
This double time constant circuit for resistive loads was found in documentation from the 1980s. The...
This circuit was found in a Popular Electronics from the 90s. The components used are all common...