This small switched regulator was found in an 60’s Optical Electronics. The circuit uses an integrated from the time, which is difficult to obtain today.
This alarm circuit was found in a 1982 publication. It uses components that can still be found...
This circuit has a voltage gain of 30 times and passband of 14 MHz. The circuit is from the 1974...
This High Side sensor with the L1637 was obtained from a Linear Technology 2005 own manual that...