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 circuit was found in a 1980s document. The integrated circuit is from the time and the power...
This simple binary counter triggers two LEDs according to the number of pulses applied to the...
We found this circuit in a documentation from the 70s. The circuit uses amplifiers from the time,...