This circuit is from American documentation from the 1980s. The transistors are general purpose types and the relay can be 6 or 12 V depending on the supply voltage.
This circuit found in a 1964 US publication reverses the signal level by providing 9 to 0 V...
This circuit is from 1967 General Electric documentation. It uses SUS which are not very common...
August 2017 - MCUs of the new Infineon MC1400 series for industrial use can now be purchased from...