Found in American documentation, this circuit for modulated infrared signals can be tuned to a certain frequency. The photodiode can be of any type.
We found this antenna amplifier or Booster circuit in an Electronics Now from the 90s. The circuit...
We found this circuit in the Linear Applications Handbook of the 1994 National Semiconductor. The...
This circuit is from a 1976 Motorola power semiconductor manual. In it we have the optical...