The circuit is from 80s Siliconix documentation. The integrated circuit is from the company and is not common today. It can be used operational equivalent more common in our times.
This bass booster preamp is from an English publication (1966). We can mount it with more modern...
This digitally programmed gain amplifier was obtained from Signetics documentation from the 1980s....
Suggested by Popular Electronics, it is a digital amplifier, for pulses with frequencies up to a...