Relaxation oscillator

About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.

Clock extracting device of disc reproducing apparatus

Abstract: A clock extracting device of a disc reproducing apparatus, comprising: an information read-out member for reading information signals from a disklike information recording medium; a voltage control oscillator; a phase comparator for comparing a phase of the information signals read by the information read-out member and a phase of an output of the voltage control oscillator; a frequency comparator for comparing a frequency of the information signals read by the information read-out member and a frequency of the output of the voltage control oscillator; a speed sensor for detecting the frequency of the output of the voltage control oscillator at a reference clock so as to output a speed signal; a gain command unit for designating a loop gain of a clock extracting circuit in accordance with the speed signal outputted from the speed sensor; a charge pump which discharges or draws electric current in accordance with outputs of the phase comparator and the frequency comparator and changes over an output current value in accordance with a gain command of the gain command unit; and a series circuit of a resistor and a capacitor, whose one end is connected to an output of the charge pump and the other end of which is grounded or is connected to a reference voltage; wherein an output voltage between the opposite ends of the series circuit acts as a control voltage for the voltage control oscillator and the gain command unit issues the gain command such that the loop gain of the clock extracting circuit secures a desired operating point in accordance with a read rate of the information signals.

220V alternating-current power supply fuse burnout flashing indicator of electric appliance

Abstract: The utility model relates to a 220V alternating-current power supply fuse burnout flashing indicator of an electric appliance, which is characterized in that a flashing indicating device is parallel-connected with the two ends of a 220V alternating-current power fuse in all kinds of electric appliances which do not use a switching power supply, ie a rectifier diode is installed on a circuit board, a resistor is serially connected to reduce voltage and limit current, a capacitor is serially connected, a bidirectional trigger diode is parallel-connected and a common blue light emitting diode is serially connected to form a relaxation oscillator, and the relaxation oscillator is led out by using two leads and is parallel-connected with the two ends of the fuse When the use is burnt out, flashing indicating signals can be given out

Pure electrical device alternating current fuse burnout blinking indication pipe

Abstract: The invention provides a pure electrical device alternating current fuse burnout blinking indication pipe. Two ends of an alternating current fuse in each electric device free of a switch power are respectively connected with a blinking indication device in parallel, namely a long-strip-shaped circuit board is arranged inside a transparent plastic pipe, the circuit board and the transparent plastic pipe have the same length, and the circuit board is provided with a rectification diode for rectification, connected with a resistor in series for voltage reduction and current limitation, and connected with a relaxation oscillator in series, wherein a capacitor is connected with a double-direction trigger diode in parallel, and connected with a blue light emitting diode in series to constitute the relaxation oscillator. The width of the circuit board is equal to the internal diameter of the transparent plastic pipe, the height of each element of the circuit board does not exceed the internal radius of the transparent plastic pipe, the circuit board is led out through two conductive wires to be connected with two ends of the alternating current fuse in parallel, and when the fuse is burned out, blinking indication signals are emitted.

A switching lateral transistor

Abstract: A switching phenomenon has been reported in certain lateral geometry transistors in silicon integrated circuits. These devices switch between conducting and nonconducting states at a critical value of V CE . A hypothesis for the mechanism has been proposed. In this paper an equivalent circuit is developed for the switching lateral transistor and is used to predict transistor behavior. The effect of manufacturing tolerances on the device switching voltage is investigated and a technique of production control is proposed. Circuits using the device are described in which the circuit switching voltage may be varied over a wide range. Some applications of the switching lateral transistor, as an overvoltage protection circuit and a relaxation oscillator, are described.

No drift zero-offset magnetometer

Abstract: A magnetometer for measuring a magnetic field has a relaxation oscillator circuit and a measurement element for providing a signalrepresenting the magnitude of the magnetic field. The oscillator includes a sensor having a coil (13) for controlling the period of the oscillator circuit, and the coil having first and second terminals. The oscillator also includes a first resistor (15) coupled to the first terminal and a second resistor (17) coupled to the second terminal. The oscillator also includes a switching element (19) coupled to the first and second terminals and to the input terminal of a driver element (11) for coupling the input terminal alternately to the first and second terminals. A gate element (21) shunts the first resistor to a DC potential when the switching element couples the input terminal of the driver element to the second terminal, and vice versa. the magnetometer will have no output drift when no field is applied.