This circuit is from 1980s documentation. The maximum operating frequency is 3.5 MHz. The current of the LED can be from 0 to 100 mA. The integrated circuits used are from that time.
In the figure we have the way to simulate an SCR using two complementary general-purpose...
Using a 4001 and a high impedance transducer this circuit generates 40 kHz sound signals set to...
The purpose of this circuit is to supply a direct reference voltage from the power grid. The...