Modified KP-12 type tuner receiving full channel circui…

This article refers to the address: http:// working principle In order to meet the requirements of full channel reception , in addition to the original function, the KP12-3 type high frequency head also needs to amplify the intermediate frequency 37MH from the UHF tuner output, and the two do n

Japan developed a new type of phosphor to increase part…

Niigata University of Japan has developed a phosphor manufacturing process with a luminous intensity of 2.6 times that of the original. According to the university, this process is expected to significantly increase the luminous efficiency of LEDs and the like. The news was published

Automatic call, intercom, and amplified telephone circu…

The device is attached to the outside of the telephone , and only the contact point of the contact spring of the pressure spring of the telephone is connected with the contact of the relays J2-2 and J2-3. It can intercom within 2 meters without having to pick up the headset and can hear the call.

Common symbols of semiconductor diode parameters and th…

CT---barrier capacitance Cj---junction (interelectrode) capacitance, indicating the total capacitance of the é”—detection diode under the specified bias voltage across the diode Cjv---bias junction capacitance Co---zero bias capacitor Cjo---zero bias junction capacitance Cj

70% of enterprises do not know the REACH directive need…

It is believed that the one-year transition period of the most complicated technical trade measure in the world, REACH, will be completed. From June 1st to December 1st this year, the relevant enterprises that failed to pre-register within the deadline will be The relevant business for export to th

Xi'an Urban Construction Association calls for prom…

Street lighting is a major consumer of electricity in the city. If you switch to solar-powered streetlights, you can save a lot of energy every year. After the investigation, experts from the Municipal Urban Construction Association issued an appeal: solar energy lighting should be promoted and pro