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.
This circuit was found in a 1977 Radio Shack documentation. Its purpose is to generate 1 Hz...
This circuit activates a relay that has a lamp as a load. The circuit is from a Radio Electronics from...
This circuit is from National Semiconductor documentation. The operational amplifier is of the...