The UAA170 integrated circuit is not very common today. This project is for a 303 Circuits from the 90s. The power supply is 12 V.
With the configuration shown in the figure, we have the relay being activated when the microphone picks...
We found this circuit in a 1992 Poptronics. What it does is to activate LEDs sequentially,...
In the figure we have an application of a voltage comparator in a circuit that fires with the...