Get On Board with. Compass Card. Compass Card is the smart card and smart choice for transit passes in the San Diego region. Compass Card is your ticket for the Bus, TROLLEY, COASTER, and SPRINTER.ompass Card. Compass Card is the smart card and smart choice for transit passes in the San Diego region. Compass Card is your ticket for the Bus, TROLLEY, COASTER, and SPRINTER.
Use of Vacuum Tube Diodes Gradually p-n junction semiconductor has come in the market and vacuum tubes got replaced by them. The most basic structure of vacuum tube is vacuum diode. Still today somewhere vacuum tubes are being used widely. These fields for application of the vacuum tubes are in Atomic Clocks; Audio Systems; Car Dashboards
Yes. But I don't think it's worth replacing a laser diode with a LED. Laser diode is used because it is much brighter and it gives a smaller light spot at a target(shooting distance - 2-5m.). If you don't have a laser diode, you'd better use a superbright LED with an optical system (magnifying glass) at a gun muzzle.aser diode is used because it is much brighter and it gives a smaller light spot at a target(shooting distance - 2-5m.). If you don't have a laser diode, you'd better use a superbright LED with an optical system (magnifying glass) at a gun muzzle.