General Electric suggests this circuit in an 80's documentation. The circuit makes use of PUTs that are not common components today. Note the timing components that may change.
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...