The DS1669 Dallas™ is a single digital rheostat or potentiometer with access to all three potentiometer terminals. The potentiometer has 64 wiper positions with equal or linear resistive step sizes.
The 2N2369A is a silicon planar epitaxial NPN transistor TO-18 metal package. It is designed specifically for high-speed saturated switching applications at current levels from 100μA to 100 mA.
The HA17324A is a quad operational amplifier that provide high gain and internal phase compensation, with single power supply. 14 Pin DIP Package. It can be widely used to control equipment.
The 2SK3515, 2SK-3515, K3515, 3515 is a 450V, 10A, 48W TO-220NIS Package MOSFET, The FUJI Electric manufacturer is a IC Chips with N CHANNEL SILICON POWER MOSFET for more details of 2SK3515 can be seen below.