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 3-digit code switch was obtained from an old American documentation. The capacitor is 470 uF...
This antenna or booster amplifier operates with signals from the midband (MW) range up to the VHF...
The circuit presented here shows how two flip-flops of a 4027 can be connected to perform a...