Found in documentation two years 80, this toy instrument uses an integrated circuit little commonly. As notes are given the values of key series resistors on the keyboard.
We found this circuit in a Motorola manual. The circuit employs operationals that are uncommon today...
In the figure we have the way to use a voltage comparator powered by a voltage to control a...
CTS IoT Quartz Crystals Available through Mouser Electronics, CTS quartz crystals are especially suited...