Found in a 1990s American technical brochure, this circuit is intended for alarms that use as photodiode sensors. The circuit has a frequency response of up to 20 kHz. The gain is 40 dB.
Found in an English publication from 1963, this circuit has the frequency range determined by the...
The circuit presented was obtained in the National Semiconductor's Linear Applications Handbook of...
We found this oscillator in a publication for radio amateurs from the 70s. The circuit generates...