BUY CA2818C https://www.utsource.net/itm/p/329612.html
18.5 dB 0.35-400 MHz 1000 mWATT WIDEBAND LINEAR AMPLIFIER
The CA2818C is a monolithic integrated circuit designed by Motorola for use as a DC motor speed controller. It is a voltage-controlled device that can be used to control the speed of a DC motor by varying the voltage applied to the motor. The CA2818C features a wide operating voltage range, low power consumption, and a wide range of speed control. It is suitable for use in a variety of applications, including automotive, industrial, and consumer applications. (For reference only)