This battery-powered micropower supply was shown in Radio Electronics magazine in 1991. The maximum current is 170 mA. and the integrated circuit is the MAX655 from Maxim.
This conventional power supply circuit with the LM317 was found in a 1987 publication and its...
This is another possible version of a negative voltage generator using a 555 integrated circuit. The...
This bridge was found in a Raytheon transistor manual from the 1960s. The transistors are...