This sophisticated decade of benchtop resistors was found in the November 1989 issue of Radio Electronics magazine. The circuit is supposed to use precision resistors.
EDN magazine in a 90's issue published this TTL technology debouncer flip flop circuit, in this...
When the base of the general purpose transistor is grounded the circuit produces a signal that is given...
This other high stability thermocouple amplifier uses an 80's operating. The circuit can be used...