This circuit from a June 1957 Radio Electgronics is for oscilloscopes of the time with a maximum frequency of a few megahertz. The circuit is battery powered.
This circuit is from a June 1968 Supertena Bulletin of Popular Electronics. The transistors can be...
This circuit causes an LED to blink from the 1.5 V supply thanks to the use of a voltage doubler. The...
March 2017 - Texas Instruments LM5166 Synchronized Buck Converters are available at Mouser for 3V...