221-197

221-197: 7-Volt 1-Amp Positive Linear Voltage Regulator manufactured by Zenith Electronics (stenciled under a proprietary internal consumer electronics service matrix part code). This three-terminal monolithic integrated circuit functions by absorbing erratic or higher incoming DC potentials and stepping them down to a smooth, highly stable +7V power rail inside vintage television chassis. (Industry Equals: Zenith 221-197, NTE Electronics NTE1914, Philips ECG1914, onsemi MC7807, STMicroelectronics L7807CV).