Modulated light receiver (CB21790E)

We found this circuit in a Mullard manual from 1960. The transistor is a phototransistor of the time. The gain is 3 dB.

6 V x 50 mA Switching Power Supply (CB13504E)
This unit is intended for powering low consumption devices. The operating frequency is...
120 Wrms Amplifier (CB17437E)
This high-power amplifier was found in 2001 documentation. The output transistors must be equipped...
Trinkets Adafruit (COM029E)
July 2016 - It can be obtained from Mouser Electronics new trinkets Adafruit. These trinkets are...