-
公开(公告)号：US5414373A
公开(公告)日：1995-05-09
申请号：US195149
申请日：1994-02-14
CPC分类号： G01R31/2614
摘要： An automatic transistor checking method is provided, whereby an unknown, bipolar transistor may be typed, pinned and checked for forward DC gain, H.sub.fe. The method is suitable for portable instruments, because the method uses little battery current to perform the H.sub.fe measurement. The method automatically determines transistor type (NPN or PNP) and pinout, making it suitable for quick checking of batches of unknown devices.
摘要翻译： 提供自动晶体管检查方法，由此可以对未知的双极晶体管进行类型化，固定和检查正向直流增益Hfe。 该方法适用于便携式仪器，因为该方法使用少量电池电流来执行Hfe测量。 该方法自动确定晶体管类型（NPN或PNP）和引脚排列，使其适合快速检查未知器件的批次。
-
公开(公告)号：US5373410A
公开(公告)日：1994-12-13
申请号：US859142
申请日：1992-03-27
CPC分类号： G01R15/125 , G01R15/04
摘要： A relatively large protection resistor is connected between the measurement in-out terminal and the internal circuitry of a digital multimeter. A clamping circuit at the input to the internal circuitry insures that any voltage applied to the input terminal will be dropped across the protection resistor, thereby avoiding an over-voltage condition which could damage the internal circuitry. A resistive divider network used to make measurements is connected between the protection resistor and the clamping circuit and is designed to take the protection resistor into account during measurements.
摘要翻译： 在测量输入端子和数字万用表的内部电路之间连接一个较大的保护电阻。 在内部电路的输入端的钳位电路确保施加到输入端子的任何电压都将跨越保护电阻器而下降，从而避免可能损坏内部电路的过电压状态。 用于进行测量的电阻分压器网络连接在保护电阻和钳位电路之间，并被设计为在测量期间考虑保护电阻。
-
公开(公告)号：US5355082A
公开(公告)日：1994-10-11
申请号：US858860
申请日：1992-03-27
CPC分类号： G01R31/2614
摘要： An automatic transistor checking method is provided, whereby an unknown, bipolar transistor may be typed, pinned and checked for forward DC gain, H.sub.fe. The method is suitable for portable instruments, because the method uses little battery current to perform the H.sub.fe measurement. The method automatically determines transistor type (NPN or PNP) and pinout, making it suitable for quick checking of batches of unknown devices.
摘要翻译： 提供自动晶体管检查方法，由此可以对未知的双极晶体管进行类型化，固定和检查正向直流增益Hfe。 该方法适用于便携式仪器，因为该方法使用少量电池电流来执行Hfe测量。 该方法自动确定晶体管类型（NPN或PNP）和引脚排列，使其适合快速检查未知器件的批次。
-
公开(公告)号：US4436956A
公开(公告)日：1984-03-13
申请号：US335553
申请日：1981-12-29
申请人： Paul T. Schreiber
发明人： Paul T. Schreiber
CPC分类号： H03H11/1291 , H04L5/06
摘要： A bandpass filter suitable for use in modem circuitry and other applications which require the filter's center frequency to be switched is disclosed. The filter circuit has the characteristic that although the center frequency is changed the overall gain of the filter remains constant. This characteristic results from using a plurality of filter sections which each have low individual gain and providing compensating gain at the input of the filter. In addition, compensating gain elements are used in each filter section so that when the center frequency of the filter is changed, the gain of each filter stage remains constant.
摘要翻译： 公开了一种适用于需要滤波器中心频率切换的调制解调器电路和其他应用中的带通滤波器。 滤波器电路具有尽管中心频率发生变化，但是滤波器的总体增益保持恒定。 该特性是由于使用多个滤波器部分，每个滤波器部分具有低的单独增益并且在滤波器的输入处提供补偿增益。 此外，在每个滤波器部分中使用补偿增益元件，使得当滤波器的中心频率改变时，每个滤波器级的增益保持恒定。
-
公开(公告)号：US4581588A
公开(公告)日：1986-04-08
申请号：US578270
申请日：1984-02-08
申请人： Paul T. Schreiber
发明人： Paul T. Schreiber
CPC分类号： H04L5/06 , H03H11/1291
摘要： A bandpass filter suitable for use in modem circuitry and other applications which require the filter's center frequency to be switched is disclosed. The filter circuit has the characteristic that although the center frequency is changed the overall gain of the filter remains constant. This characteristic results from using a plurality of filter sections which each have low individual gain and providing compensating gain at the input of the filter. In addition, compensating gain elements are used in each filter section so that when the center frequency of the filter is changed, the gain of each filter stage remains constant.
摘要翻译： 公开了一种适用于需要滤波器中心频率切换的调制解调器电路和其他应用中的带通滤波器。 滤波器电路具有尽管中心频率发生变化，但是滤波器的总体增益保持恒定。 该特性是由于使用多个滤波器部分，每个滤波器部分具有低的单独增益并且在滤波器的输入处提供补偿增益。 此外，在每个滤波器部分中使用补偿增益元件，使得当滤波器的中心频率改变时，每个滤波器级的增益保持恒定。
-
公开(公告)号：US5424903A
公开(公告)日：1995-06-13
申请号：US3138
申请日：1993-01-12
申请人： Paul T. Schreiber
发明人： Paul T. Schreiber
CPC分类号： G06F1/266 , H02J13/0055 , G06F2200/261 , Y02B90/226 , Y04S20/16 , Y10T307/477 , Y10T307/484
摘要： An intelligent power switching system for controlling the electrical connection of a power source to each of a plurality of outputs, such as personal computer components or electronic entertainment equipment. Switch circuitry is coupled to relay circuitry for generating signals responsive to user commands to select an "on" or "off" state with respect to each output. A processor receives switching signals and generates control signals to effect actuation of the relays. Responsive to user programming commands, the processor stores the switching signals, their sequence and the time delay between their generation. Responsive to a subsequent abbreviated user "power-on" command, the processor generates control signals by reading the stored switching signals, their sequence and time delay, and automatically actuates the relays with respect to each output in the same order and with the same time delay as defined by the user programming commands. A "power off" command causes the relays to be actuated in the reverse order.
摘要翻译： 一种用于控制电源与诸如个人计算机组件或电子娱乐设备的多个输出中的每一个的电连接的智能电力交换系统。 开关电路耦合到继电器电路，用于响应于用户命令产生信号，以相对于每个输出选择“开”或“关”状态。 处理器接收切换信号并产生控制信号以实现继电器的致动。 处理器响应于用户编程命令，存储切换信号，它们的序列和它们的生成之间的时间延迟。 响应于随后的缩写用户“开机”命令，处理器通过读取所存储的切换信号及其顺序和时间延迟来产生控制信号，并且以相同的顺序和相同的时间自动地对每个输出启动继电器 由用户编程命令定义的延迟。 “关机”命令使继电器以相反的顺序启动。
-
公开(公告)号：US20090131000A1
公开(公告)日：2009-05-21
申请号：US11944120
申请日：2007-11-21
申请人： Yao H. Kuo , James E. Brewer , Tom P. Moyles , Gary E. Zack , Paul T. Schreiber
发明人： Yao H. Kuo , James E. Brewer , Tom P. Moyles , Gary E. Zack , Paul T. Schreiber
IPC分类号： H04B1/06
CPC分类号： H03B5/1231 , H03B5/1215 , H03B5/124
摘要： An oscillation circuit for a radio receiver system. The oscillator circuit includes a tank circuit, a first and second transistor, and a first and second low pass filter. The first transistor forms a first current loop when the first transistor is active. Similarly, the second transistor forms a second current loop when the second transistor is active. The first low pass filter is connected in an electrical series connection within the first current loop and the second low pass filter is connected in an electrical series connection within the second current loop. As such, the first and second low pass filter serve to reduce the gain of the oscillator circuit below a secondary resonant frequency of the tank circuit to prevent an oscillation condition, thereby preventing unwanted oscillations at a secondary resonant frequency.
摘要翻译： 一种用于无线电接收机系统的振荡电路。 振荡器电路包括一个振荡电路，一个第一和第二晶体管以及一个第一和第二个低通滤波器。 当第一晶体管处于活动状态时，第一晶体管形成第一电流回路。 类似地，当第二晶体管处于活动状态时，第二晶体管形成第二电流环路。 第一低通滤波器以第一电流回路内的电串联连接，第二低通滤波器以第二电流回路内的电串联连接。 这样，第一和第二低通滤波器用于将振荡器电路的增益降低到低于谐振电路的次级谐振频率以防止振荡条件，从而防止次级谐振频率下的不必要的振荡。
-
公开(公告)号：US4503429A
公开(公告)日：1985-03-05
申请号：US339478
申请日：1982-01-15
申请人： Paul T. Schreiber
发明人： Paul T. Schreiber
CPC分类号： G09G5/40
摘要： Electronic circuitry for generation of graphics images on a computer display screen is disclosed which allows graphics capability to be added or retrofitted to computers having standard video display character generation circuitry. The graphics circuitry receives address, data and control signals from the normal computer peripheral bus. Address signals received by the graphics circuitry are interpreted as command signals and, in accordance with the command signals, data present on the computer peripheral data bus is interpreted either as graphics data to be written in a random access graphics memory or as an address location for such data in the memory. The graphics circuitry normally operates asynchronously with respect to the computer under control of the character clock generated by the character generation circuitry. Proper synchronization with computer operation is achieved by using wait commands which cause the computer circuitry to cease processing temporarily while write or read operations are being processed by the graphics circuitry. In addition, special circuitry is provided which allows the graphics circuitry to automatically increment and decrement address information stored within the circuitry.
摘要翻译： 公开了一种用于在计算机显示屏幕上产生图形图像的电子电路，其允许将图形能力添加或改装到具有标准视频显示字符产生电路的计算机。 图形电路从正常的计算机外围总线接收地址，数据和控制信号。 由图形电路接收的地址信号被解释为命令信号，并且根据命令信号，存在于计算机外围数据总线上的数据被解释为要写入随机存取图形存储器中的图形数据或作为 这样的数据在内存中。 图形电路通常在由字符产生电路产生的字符时钟的控制下相对于计算机进行异步操作。 通过使用等待命令实现与计算机操作的正确同步，这些命令使计算机电路在图形电路正在处理写入或读取操作时暂时停止处理。 此外，提供了特殊电路，其允许图形电路自动地增加和减少存储在电路内的地址信息。
-
-
-
-
-
-
-
搜索结果
8 条记录 (耗时 0.018 秒)
