This 12 V x 2 A regulator was found in 1965 Delco Radio documentation. The circuit uses transistors from that time. The input voltage can vary by 15% around the indicated value.
This interesting circuit found in an Elektor from the 90s controls loads in four quadrants of the driving...
This flip-flop was found in an old documentation, being able to use transistors of general use...
For the component values used in thisf this circuit, the frequency can be adjusted between 740 Hz and...