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  • Eyesight Protection Reminder

    2016-09-22 10:11:5360

    When the indoor light is strong, the inside resistance value of light sensitive resistor is small. IC's 1 pin has a low level, and 2 pin has a high lev...

  • Amplifier tube protector circuit

    2016-09-22 10:03:5760

    The amplifier tube protector circuit is as shown in the figure.Working principle: K is the power supply switch, T1 is the small control power transform...

  • Over-voltage protection circuit

    2016-09-22 09:06:4260

    A silicon-controlled rectifier is installed in parallel with the 12-V line and connected to a normally-closed 12-V relay, K1. The SCR's gate circuit is...

  • Three-phase three-wire system open phase protection circuit

    2016-09-22 08:44:4860

    This is an openphase protection circuit for three-phase three-wire power supply. A, B, C are lack of any one phase, the optocoupler output level is low...

  • FLYING_SPOT_SCANNER_PROTECTS_MICRO_FILM

    2016-09-22 08:19:0060

    When black mark on microfilm covers quiescent spot, sweep is tripped and rectangular pulse on cathode of V2 cuts it off. 931A multiplier phototube then...

  • Temperature protection circuit working in the AC grid

    2016-09-22 06:50:0360

    It is very dangerous that many devices are working with the over-allowable temperature, so we must set the protection circuit. The thermistor showes th...

  • Over-voltage over-current protector

    2016-09-22 06:43:2260

    In the normal working hours, Tr1 and Tr2 are cut-off, 555 is reset, and the discharge transistor of the 555 is conducted, it absorbs the current from T...

  • Low Voltage Regulators with Short Circuit Protection

    2016-09-22 05:19:3260

    These Low Voltage regulators with short circuit protection can provide 6, 7.5, and 9 V from an automobile battery supply of 13.5 V nominal, however, th...

  • OVERLOAD_PROTECTION_2

    2016-09-22 05:19:3262

    Switches power off rapidly to prevent current overloads from damaging transistors in breadboard circuits under test. Voltage drop across 0.47-ohm resis...

  • 555 household appliances protector circuit

    2016-09-22 04:58:0960

    As the figure 15-6 shows, the household appliances protector is composed of the step-down rectifier circuit, the under-voltage over-voltage sampling ci...

  • Mains supply overvoltage protection circuit with good perfor

    2016-09-22 04:02:3762

    In electric power lacking areas, the power supply is very unstable, the peak value is only about 170V, at night, it is over 250V, in order to protect t...

  • SCR_OVERVOLTAGE_PROTECTOR

    2016-09-22 02:34:2960

    Depending on the setting of R1, when the voltage exceeds a certain amount, SCR1 triggers, which activates K1 and opens the circuit. S1 resets the SCR....

  • The protection circuit of IBA base power supply system

    2016-09-22 01:34:0460

    In many computer and communication applications, non-isolation load point (niPOL) Intermediate Bus Architecture (IBA) converter is replacing continuous...

  • Electrical equipment overload and open-phase protection devi

    2016-09-22 00:53:3860

    The device is composed of +12 V, +5 V DC power supply, AC transformer, voltage comparator, block timer, relay control circuit and phase loss protection...

  • Norton_regulator_with_high_voltage_input_protection

    2016-09-22 00:46:2860

    This circuit uses one section of an LM3900 as the control element in a voltage regulator. Q1 and Q2 absorb any high input voltages, and therefore must ...

  • MOV_SURGE_PROTECTION_CIRCUIT

    2016-09-22 00:10:1860

    Three MOV devices (connected as shown) provide superior protection against line surges because all three legs are protected against excessive potential...

  • MODEM_PROTECTOR

    2016-09-21 23:41:5260

    This protector uses surge voltage protectors rated at 230-V breakdown. An effective ground should be used....

  • A diode protect cmos circuit (74HCT132)

    2016-09-21 23:34:1163

    This article describes the A diode protect cmos circuit (74HCT132). The content is very simple, very helpful. Components in this article can help you u...

  • How to protect IGBT

    2016-09-21 22:23:0560

    How to protect IGBT from failures and breakdowns ? Insulated Gate Bipolar Transistors are susceptible to gate insulation damage by the electrostatic di...

  • CURRENT_FOLDBACK_PROTECTION

    2016-09-21 22:15:0360

    MPC1000 hybrid regulator provides regulated output of 5 V at 5 A from 14-V input. Values of components are based on foldback current of 6 A and short-c...

  • Overvoltage protection circuit with automatic reset

    2016-09-21 21:50:2560

    The circuit mainly includes power supply, trigger start and control, to control load R1 turn on or off power supply through TRIAC ZN6346. Once the AC p...

  • DC regulated power supply protection circuit composed of 555

    2016-09-21 21:43:2460

    Monostable delay circuit is composed of the IC2 (555), R3, C4 and other components. Usually, J1-1 NC contact closes, the load makes IC2 ④ feet in a h...

  • SERIES_REGULATOR_WITH_OVERLOAD_PROTECTION

    2016-09-21 20:53:0863

    Tunnel diode and transistor serve as overload sensing circuit used to trigger monostable mvbr, to protect series-pass transistors against overload. Cir...

  • the protection circuit of power circuit

    2016-09-21 19:49:0560

    The current in power circuit is great and wecan adopts fuse,diode,transistor circuit to limit the current.Fuse is the simplest protection component.Pic...

  • Eyesight Protecter (the 3rd)

    2016-09-21 19:05:0660

    Work of the circuitThe circuit consists of power circuit, infrared launching circuit, infrared reception and amplifying circuit, light examining circui...

  • MAX6499 Overvoltage and Undervoltage Protection CIRCUIT (SN7

    2016-09-21 17:55:0862

    This article introduces the MAX6499 Overvoltage and Undervoltage Protection CIRCUIT (SN74F74NE4). The content is very simple, very helpful. Components ...

  • Monolithic over and under voltage protection circuit diagram

    2016-09-21 17:26:0962

    The over and under voltage protection circuit is composed of the six Schmitt trigger CD4584 . When it is over-voltage or under voltage. The circuit wil...

  • PWM inverter over-current protection circuit diagram

    2016-09-21 16:54:1260

    It can prevent IGBT or MOSFET output stage from being damaged by large current flowing. The maximum current is 23A when the motor is overcurrent, and t...

  • The typical CLA protection circuit

    2016-09-21 16:44:2961

    Because the changeful car environment and to supply power for all kinds of precision electronic equipments, so the CLA needs to work in wide range of t...

  • Signal Wire Protection Circuit

    2016-09-21 15:38:5560

    Generally the signal wire would not be connected to ground when it is running. If take a two-polar gas discharging tube to connected between the two si...

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