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.
This circuit uses a ceramic transducer to emit ultrasound whose frequency depends on C2. The...
We found this Nicad cell charging circuit in an English publication from the 1970s. The circuit can...
This small transistor radio was published in Radio Electronics magazine in November 1957. The...