This sensitive circuit was found in an Electronics Hobbyists Handbook from the 1990s. The circuit can use common general-purpose transistors in place of the original ones.
This 4.5 MHz amplifier is suitable for analog TV applications. We found it in a 1967 Philips...
This circuit is one of many that can be found in this section using the 555. This circuit was...
We found this circuit in the 1994 National Semiconductor Linear Applications Handbook. The circuit is...