This circuit is from a 1968 Texas Instruments documentation. The components are from the time and the sensor photodiode is difficult to obtain today. The circuit has a response from 10 Hz to 20 kHz.
We found this circuit in a 73, magazine for radio amateurs of the 90s. The circuit is passive and...
This configuration for proper connection of parallel amplifiers was found in National...
We found this circuit in a 1965 General Electric documentation. The circuit generates synchronized...