Common base transformer stage (CB22223E)

Found in an old American documentation, this step has as input and output transformers coupling. Two power sources are used.

General purpose buffer (CB9312E)
Found in documentation from Analog Devices from the 90s, this amplifier uses a component from the...
2 lithium batteries charger (CB9128E)
This charger was found in an 80's Electronic Design. The circuit uses components from that time....
Telephone Tone Generator (CB13935E)
This double tone generator uses a specific integrated circuit, having been found in a 1977 CMOS...