Audio Cable Tester (CB3827E)

This simple circuit tests both monophonic and other two-wire audio cables. The circuit is powered by two common batteries.

Low Drift Sampling and Hold (CB21227E)
This circuit was found in National Semiconductor documentation from the 1990s. It applies to...
Signal generator (CB21057E)
Found in Popular Electronics, this '90s circuit generates harmonic-rich signals for testing audio...
1W Amplifier For Headphones (CB12960E)
The circuit shown in the figure is suggested by ON Semiconductor (www.onsemi.com), based on its...