Surface Mount Trimming Potentiometer Design Kit - Trimpot® H-815 Bourns Trimpot® H-815 Trimming Potentiometer design kit to accommodate various applications and board designs. Each H-815 Design kit contains a variety of sizes of multiturn and single-turn surface mount potentiometers which have an open frame and are sealed. The H-815 series Design Kits have a wide variety of applications including Phone headsets, Power supplies, Credit card readers, Smoke detectors, Plasma televisions, GPS navigation, Barcode scanners, CCTV cameras, Control systems, Radar systems, Analytical equipment and Stereo equipment.