This simple indicator circuit was found in a documentation from the 90s. Trimpots can have values between 2k and 10k, a series resistor is recommended to limit the current to the minimum setting.
Obtained from a 1996 documentation, this circuit uses common components and has a voltage gain of 200...
This precision circuit can provide timings from 0.2 milliseconds to 3 minutes accurately. The...
Found in RCA documentation from the 90s, this bass and treble control uses an operational...