Found in documentation from the 1980s, this circuit uses an operational amplifier from that time. Transistors are also from the era, and general-purpose equivalents can now be used.
This circuit is from American documentation from the 90s. The transistor is general-purpose and...
In the MEMs line of the ST available on Mouser Electronics we highlight the MP23AB01DH audio...
This circuit produces horizontal lines or bars in a analog TV tuned between channels 2 and 5. L1...