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Buick gating lamp circuit

Published:2011/4/10 21:47:00 Author:Jessie | Keyword: gating lamp

Buick gating lamp circuit
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Buick dashboards circuit (ub3)

Published:2011/4/10 21:36:00 Author:Jessie | Keyword: dashboards

Buick dashboards circuit (ub3)
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Buick electronic steering circuit

Published:2011/4/10 21:34:00 Author:Jessie | Keyword: electronic steering

Buick electronic steering circuit
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Buick cruise control circuit

Published:2011/4/10 21:18:00 Author:Jessie | Keyword: cruise control

Buick cruise control circuit
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Single junction transistor trigger thyristor by pulse transformer circuit

Published:2011/3/24 3:27:00 Author:Jessie | Keyword: Single junction transistor, trigger thyristor, pulse transformer

Single junction transistor trigger thyristor by pulse transformer circuit
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The principle diagram of IGBT over current protection circuit

Published:2011/4/10 21:50:00 Author:may | Keyword: IGBT, over current protection

The principle diagram of IGBT over current protection circuit
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The application circuit of EXB841

Published:2011/4/10 21:28:00 Author:may | Keyword: application

The application circuit of EXB841
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The principle circuit of EXB841

Published:2011/4/10 21:30:00 Author:may

The principle circuit of EXB841
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The application circuit of EXB850

Published:2011/4/10 21:31:00 Author:may

The application circuit of EXB850
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The basic principle of static switch

Published:2011/4/7 22:10:00 Author:may | Keyword: static switch

The basic principle of static switch
The usage of static switch: it can parallel normal work only when two AC power supply has the same frequency, amplitude. When one AC power supply go wrong, will generate restoring current between the two power supply, thereby make changes of output voltage in two parallel power supply, it will influence the reliable of power supply. The usage of static switch is cut the error power supply to output, and accomplish unbroken switchover between inverter output and commercial power bypass output. We mostly adopts high-speed relay as switching device, because its switching time only has 2ms~5ms, is fit for the requirement of communication equipment needing power supply without interruption. In the case of UPS power supply with capacity above 2KVA, because the increase of relay working current, its switching time will add to 80ms~120ms, and sparkle generated in the moment relay snapping will cause high temperature to damage the contact point, or voltaic arc generated between normal open and normal close contact point will short circuit the two AC power supply in a moment, so relay using for switching is only limit to low capacity UPS power supply, but its switching time has tens seconds. (View)

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Human body induction alarm circuit diagram

Published:2011/4/6 21:56:00 Author:Rebekka | Keyword: Human body induction, Alarm circuit

Human body induction alarm circuit diagram
The alarm circuit is a alarm device that makes use of the distributed capacitance of the human body and to work. The multivibrator type oscillator composed of BG1, L1, C1 works but the relay does not before a human body access the alarm; When a human body access the alarm, the periodic circuit will stop work and the alarm will work because of the capacitance of human body. (View)

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Optical controlling switch circuit using LDR transistor

Published:2011/4/10 21:00:00 Author:Ecco | Keyword: Optical controlling switch , LDR transistor

Optical controlling switch circuit using LDR transistor
When there's incident light, the LDR in the circuit connects to high level or zero level. The transistor amplification factor βshould be higher than 100, the value of LDR is between 00Ω ~ 100kΩ, they are suitable for bright light and dark shooting situations respectively. If you want to control the high power load, you should adopt Darlington transistors. (View)

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Control circuit of a frying pan

Published:2011/3/22 3:18:00 Author:may | Keyword: Control

Control circuit of a frying pan is shown in the following diagram: (View)

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Fan reactor speed controller circuit

Published:2011/3/28 22:40:00 Author:may | Keyword: Fan reactor speed controller

Fan reactor speed controller circuit is shown in the diagram: (View)

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Motor control circuit diagram braked by three-phase half-wave rectifier

Published:2011/4/10 20:42:00 Author:Ecco | Keyword: Motor control , brakinged , three-phase, half-wave, rectifier

Motor control circuit diagram braked by three-phase half-wave rectifier
It's motor control circuit braked by three-phase half-wave rectifier, when the AC contactor IC disconnects with the power, 2C, SJ time relays take action immediately, 2X main contact short connects with three winding lead wires of motor and then connects with Three-phase half wave rectifying power supply, then stator windingof motor is connected to parallel symmetrical line of which one end connects to null line. That is to achieve the purpose of braking, and then SJ delayed discinnects, 2C loses electric and releases, the braking ends. The braking lines is suitable for motor star connection, it has the advantages of small volume, low cost and simple lines, but also for larger capacity motor. It's shown as the chart: (View)

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Automatic water level control circuit diagram of draining tank

Published:2011/4/7 21:20:00 Author:Ecco | Keyword: Automatic , water level control, draining tank

Automatic water level control circuit diagram of draining tank
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The school bell timing circuit diagram

Published:2011/4/10 20:20:00 Author:Ecco | Keyword: school bell timing

The school bell timing circuit diagram
General school bell is pulled by the people, but it is difficult to control the tone time. It can solve this problem by installing a timer to control ring. Working principle is shown in Figure 213: To press the button QA when pulling the bell, the time relay SJ pulls, bell ring tone is also energized, to release the button QA, as the SJ pulls, SJ normally open point is self-hold until time relay seting time(time relay could adjust to 1 minute or according to the choice), the delay normally closed point is cut off and make time relay loses electric and releases, SJ normally open point is cut off, the tone will stop. (View)