This damped oscillator that mimics the sound of a gong was found in 90s American documentation. The circuit signal must be applied to an external amplifier.
We found this circuit on Motorola Linear Interface ICs from 193. Other circuits in the series can...
This traditional version of a double time constant dimmer using triac is from the 90s...
This circuit is from National Semiconductor using an LM11, which is uncommon nowadays. The circuit...