JFET Astable (CB22020E)

This circuit generates signals whose frequency depends on C1 and C2. JFETs are common types like BF245 or MPF102.

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...