This circuit triggers an alarm in the event of a power failure. The circuit is from an 80's documentation, being powered by 9 V battery. The parts are common today.
This circuit is ideal for the design of interfaces and shields, as it allows total isolation of...
Found in a 1968 EEE, this circuit accepts frequencies from 1 to 1000 Hz and control voltages from 0.1 to...
Found in a 1970 EEE this circuit emulates a zener diode whose voltage can be set to R2. Power...