This Power supply sources from 500 to 1,000 mA according the transformar and was found in a publication of the year 1958. The diodes can be now the 1N4004 and the transistor should be mounted on a heatsink.
This timer was found in an English publication from 1979. The circuit can be powered with voltages...
This is a typical configuration of a function generator with voltage comparators. Three old...
Found in the August 1994 issue of Electronics Now, this CMOS circuit uses the 4046, which is...