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 percussion circuit was found in an Electronics World of 1968. The transistor may be general...
This pulse generator was found in a 1967 publication. We can assemble it with the 2N2646...
This switched stepdown regulator was found in a 60s documentation. It makes use of unusual...