This circuit found in a 1964 US publication reverses the signal level by providing 9 to 0 V outputs from 0 to 9 V signals. Transistors may be equivalent.
This circuit was found in the January 1994 Electronics Now magazine. The transistors are general...
Found ina 1970 American documentation this fast-reading circuit uses a photodiode. Transistors...
The transistors of this circuit found in a 1965 magazine can be the BC558 and the sensitive 12 V x...