This circuit different from the timer was found in an English publication from 1978. The circuit uses a sensitive relay (1200-ohm), a reed relay, for example. The supply can also be made with 12 V for relays with this voltage and the time is given by C1 together with R2. See how to calculate the time constant in the math section. Equivalent operational amplifiers can be used. A white LED can be used instead of the lamp.
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