We found this parallel regulator in a 1973 publication. Transistors admit equivalents and the output voltage can be modified by changing the zener.
The Texas Instruments LM5178 Buck-boost controller is capable of operating in the 4.2 to 55 V (60...
This 1970 Philips circuit uses a mechanical counter. The circuit is triggered by a reed switch...
This 1 MHz oscillator was found in an Electronics World of 1969. The circuit uses a...