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 originally designed for medical applications and biological experiments. The...
This circuit for a frequency of 40 kHz was found in an old Electronic Design. There were no...
The simple touch of the fingers on a sensor causes this circuit to drive a motor that goes into...