Published:2011/4/19 3:08:00 Author:Ecco | Keyword: fridge, over voltage, under voltage, power delay , protector
The chart shows a fridge over voltage, under voltage, power delay protector circuit. The circuit consists of over and under voltage sampling circuit, trigger circuit, delay circuit, the buck rectifier circuit. And the buck rectifier circuit provides DC voltage for the entire circuit.
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Published:2011/4/19 1:56:00 Author:Jessie | Keyword: Delay
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Published:2011/4/19 1:44:00 Author:Nicole | Keyword: festival color lamp, piano music, program control
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Published:2011/4/19 1:26:00 Author:Nicole | Keyword: color lamp, piano music
As shown in the figure, it consists of clock beat generator, light control circuit, middle power amplifier and AC depressurization, steady voltage circuit. CA3130(IC1) is a BiMOS single operational amplifier, it with RP1, R3, C1 will from a self-excited oscillator, the oscillation frequency depends on the charge and discharge time of RP1, C1. Its output beat pulse is used as SH-818 function control pulse. (View)
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Published:2011/4/19 0:56:00 Author:Nicole | Keyword: bidirectional SCR, dimming light
As shown in the figure, this is a simplest bidirectional SCR dimming light circuit, the feature of it is that adding proper trigger pulse or control current to its control pole, it will turn on whether it is AC positive half cycle or negative half cycle, the conduction time depends on the pulse width and gate current. To adjust RP will change the brightness of bulb E. (View)
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Published:2011/4/19 0:46:00 Author:Nicole | Keyword: unidirectional SCR, dimming light
As shown in the figure, this is a simplest unidirectional SCR dimming light circuit, the two 3~5A/600V unidirectional SCR are antiparallel, their gates are connected by a 100kΩ potentiometer, then they form a stepless dimmer with 200W load. (View)
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Published:2011/4/18 23:50:00 Author:Nicole | Keyword: showcase or bulletin board, timing light, controllor
As shown in the figure, it is a showcase or bulletin board timing light controllor composed of two electronic tables, the electronic table 1 is used to set everyday lighting up time, the electronic table 2 is used to set everyday turn-off light time. (View)
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Published:2011/4/18 22:30:00 Author:Nicole | Keyword: relay, timer, time process
In figure (a), the circuit has two-stage circuit structures, the timing time is about 0.5~12s, and in figure (b), the range of the timing time is 1~160s.
The parameters of transformer: iron chip: M42/15.7 silicon steel sheet; winding: Φ0.18mm, enameled copper wire 1200turns.
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Published:2011/4/18 20:42:00 Author:Nicole | Keyword: storage battery, alarm, time control
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Published:2011/4/18 22:14:00 Author:Nicole | Keyword: delay floodlight, timing control module
Multifunction delay floodlight control circuit composed of YH2902A. Rx=120kΩ, Cx=1pF, and t=1/1(0.7~1)·Rx·Cx], then this circuit can achieve delay 5mins, 15mins, 30mins and uncertain time four kinds working processes. (View)
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Published:2011/4/18 20:05:00 Author:Nicole | Keyword: Low voltage light, timing flashing
MPU131 is program control SCR, with R1, C1 form flip-flow oscillation circuit, the output control two unidirectional SCR 2N5060, then the low voltage (2V) indicator light will send out timging flashing. (View)
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Published:2011/4/18 0:30:00 Author:Nicole | Keyword: Valve control, temperature adjusting
This temperature control circuit can control 220V servo motor to turn left or right, its static range can be adjusted. The bae of push pull stage is controlled by feedback amplifier TAA861, switches T3 and T4 each controls its relay to make the motor turn left or right.
The temperature testing adopts R1~R6 bridge circuit, the sensor is K274 thermal resistor, using potentiometer R1 to pre-select the given temperature.
The main technical data: the work voltage: 18V; the temperature range: 25~95℃; the highest temperature of sensor: 100℃; the temperature difference within ±10% power voltage wave motion: < 0.1°K; the adjustable static region: 0.2~1°K.
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Published:2011/4/10 22:55:00 Author:may | Keyword: limiting short circuit , IGBT grid-emitting stage voltage
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Published:2011/4/14 6:29:00 Author:may | Keyword: internal structure
HL601A is thick film integrated circuit.It can achieve dual-level protection of signal's over current, over voltage, over heating, etc. Its features include precise threshold, fast speed, and high reliability. (View)
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Published:2011/3/24 21:47:00 Author:may | Keyword: Delay lamp controller
Delay lamp controller circuit composed of CD4017 is shown in the following diagram:
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Published:2011/4/18 20:40:00 Author:Nicole | Keyword: delay, time control
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Published:2011/4/18 20:38:00 Author:Nicole | Keyword: temperature protection, constant current, charging timer
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Published:2011/4/18 20:33:00 Author:Ecco | Keyword: Power failure , alarm circuit
Sometimes, when the power is black out for some reasons, it needs to alarm automatically to inform people overcoming the breakdown as soon as possible. Figure 185 shows a power failure alarm. When power supply works normally, ZJ contactors pull in, so that the ZJ normal closed contact cuts off, then power is charging by the electrolytic capacitor C1 between the lights XD and diode D. When the power is black out for some reasons, ZJ contactors release, so that electrolytic capacitor C1 discharges to the sound and light alarm circuit, neon light bulbs turn on, speakers emit alarm signals, the alarm time is 5 to 6 minutes.
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Published:2011/4/5 20:44:00 Author:may | Keyword: 800W, three-terminal, bidirectional thyristor, dimmer
MBS4991 silicon bilateral switch is produced by Motorala company. We can utilize it to control phase of three-terminal bidirectional thyristor. 1MΩ regulation resistance can let the turn-on angle of three-terminal bidirectional thyristor changing from 0° to about 170°. When adjusting to maximum, the power added to load can reach 97% of full power. Now matter what the posistion the regulation resistance is, turn-on angle of upper half period and the turn-on angle of lower half poriod is exatly equal.
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Published:2011/4/18 7:42:00 Author:Jessie | Keyword: united electronics, electric control system
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