Derwent Classification System: Electronic Components

Includes electrical and electro-optical components. Component mounting and construction details. Electrical discharge devices are included.

V01 Resistors and Capacitors (H01C, G) Low power fixed and variable devices. Thermistors. VDRs. Electrolytic and non-electrolytic capacitors.
V02 Inductors and Transformers (H01F) Low power inductive components. Communication type inductive components. (Electro)magnets.
V03 Switches, Relays (H01H) Low power switches and relays. Thermally or magnetically operated switches.
V04 Printed Circuits and Connectors (H01R, H05K) PCBs and their manufacture. Low power connectors. Electronic apparatus, housings and constructional details. RFI/EMI screening. General circuit manufacture.
V05 Valves, Discharge Tubes and CRTs (H01J, H05G) Vacuum tubes, klystrons, TWTs, magnetrons, CRTs, camera tubes, X-ray tubes and operating circuits. Photoelectric discharge tubes. Gas filled tubes. Gas discharge displays.
V06 Electromechanical Transducers and Small Machines (H04R, H03H, H02K) Audio-communication - and measurement type transducers. Electromechanical resonators. Small electric machines and their controllers.
V07 Fibre-optics and Light Control (G02B, F) Light guides. Connectors, couplers, mode selectors, polarisers. Switching, gating, modulating etc.
V08 Lasers and Masers (H01S) Laser and maser devices. Pumping and mode locking circuitry.