This circuit allows you to adjust the balance between channels of a stereo amplifier. The circuit makes use of an analog indicator with zero in the center of the scale.
This circuit was found in old documentation. The frequency depends on R1 and C1. For the...
For low-frequency signals, this circuit transforms a single oscilloscope into a dual-trace. The...
Using the 555 this circuit was found in a Popular Electronics from the 90's. The circuit directly...