Differential amplifier circuit
    41.
    发明授权
    Differential amplifier circuit 失效
    差分放大电路

    公开(公告)号:US06252457B1

    公开(公告)日:2001-06-26

    申请号:US09472874

    申请日:1999-12-28

    Abstract: Emitters of a first NPN transistor and a second NPN transistor forming a differential input section are respectively connected to collectors of a third NPN transistor and a fourth NPN transistor; the collectors and bases of the third NPN transistor and the fourth NPN transistor are respectively connected through first and second capacitors; and the bases of the third NPN transistor and the fourth NPN transistor are respectively connected to a first reference power source through first and second resistors.

    Abstract translation: 形成差分输入部的第一NPN晶体管和第二NPN晶体管的发射极分别与第三NPN晶体管和第四NPN晶体管的集电极连接; 第三NPN晶体管和第四NPN晶体管的集电极和基极分别通过第一和第二电容器连接; 并且第三NPN晶体管和第四NPN晶体管的基极分别通过第一和第二电阻器连接到第一参考电源。

    Planar heating element
    44.
    发明授权
    Planar heating element 失效
    平面加热元件

    公开(公告)号:US4074222A

    公开(公告)日:1978-02-14

    申请号:US601178

    申请日:1975-08-01

    CPC classification number: H05B3/56 H05B3/146 H05B3/565

    Abstract: A planar heating element having a thin flat body formed from an insulating thermoplastic resin and electrically conductive powder. The electrically conductive powder is formed in a layer within the thermoplastic resin in the neighborhood of the entire surface of the body. Lead wires within the flat body being positioned near the surface of the body such that the lead wires are electrically connected to said layer of electrically conductive powder. The planar heating element being produced by a method comprising melt-admixing an insulating thermoplastic resin with an electrically conductive powder. The mixture is then extruded, and the extruded body is rapidly cooled.

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