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 configuration was found in an old technical documentation from the 70s, but it can be...
In the figure we have a converter that generates a negative voltage from a positive voltage...
This circuit was found in a 1976 magazine. The circuit emits a sound when a balance sensor placed on...