This timer was found in Japanese documentation from the 1960s. The transistor can be replaced by an equivalent and the relay must be of the sensitive type with voltage according to the power supply.
This is a very common circuit in the days of xenon flashes for cameras. This is from a Radio...
This circuit uses a resonant reed relay to recognize the frequency of an input signal. Adaptations...
This circuit controls the passage of the signal from an input to an output using a DC signal from a...