This version is from an old 80's documentation. The SCR can be the TIC106 and the unijunction transistor the 2N2646. The 560k resistor can be replaced with a 470k potentiometer in series with a 47k resistor for time adjustment.
![](/images/stories/cir/2191292023_143609_0001.gif)
This version is from an old 80's documentation. The SCR can be the TIC106 and the unijunction transistor the 2N2646. The 560k resistor can be replaced with a 470k potentiometer in series with a 47k resistor for time adjustment.