Infrared modulated transmitter (CB7247E)

This simple Philips circuit from the 1960s can use any general-purpose transistor. The signal is modulated at 2.7 kHz.

CB15908E Photodiode Amplifier (CB15908E)
This circuit is suggested by National Semiconductor and has an excellent gain, for a photodiode as a...
Incandescent Light Effect (CB11374E)
With the circuit shown, when the brightness of one lamp decreases, that of the other increases. There is...
Differential thermometer (CB9489E)
We found this circuit in an Intersil documentation. Temperature sensors are special components of the time,...