We found this circuit in a 1996 publication. The circuit uses components that are still common. The timing depends on C1, which can be changed, and the triac can be of any type.
This circuit was found in a Japanese documentation of the 70's. It uses transistors of the era and is...
The circuit shown in the figure is based on the ST Microelectronics TDEO0160 (www.st.com) and...
This lead-acid battery charger was found in a Popular Electronics from the 90s. The circuit has a...