This modulator amplifier for transmitters was found in a 1947 American book. The circuit uses an output with 4 tubes connected in parallel and in push-pull.
This circuit was found in a Popular Electronics from the 90s. The circuit uses a general purpose...
This 2000 circuit can work with one of the many infrared remote-control transmitters described in this...
We found this amplifier for automotive use in the Philips Databook of 1990. The circuit has a...