This circuit is from a publication from the 70s. The operational amplifier is from the period. Modern equivalents according to the motor current must be used.
The transmission range of this transmitter can be between medium and short waves depending on the...
This circuit was sent by reader and collaborator Adriano Muniz Moura from Pirapora – MG. The...
This circuit was obtained from an Electronics World of 1968. The transistor may be general purpose and...