The circuit shown was obtained in American documentation from 1968. MOSFETs can be replaced by equivalents. The circuit dissipation is less than 0.5 mW.
We found this circuit in an American 80's documentation. The resistors must be of high precision...
This circuit activates a warning lamp when an incoming call is received. We found it in an 80s...
This transmitter generates modulated infrared radiation and can be used as the basis for a remote...