The operational amplifier of this circuit can be the 741. The circuit has very low consumption and can be powered by two 9-B batteries. Low voltage amplifiers can be used.
This quick response game was found in a Popular Electronics from the 80s. It uses only discrete analog...
Pressing S1 the LED glows by a time interval depending on the capacitor. Time intervals in the...
This filter was found in a 1975 American technical publication. The filter can be of any type and...