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Long time delay timing circuit with CD4541

Published:2011/4/19 22:43:00 Author:Jessie | Keyword: Long time delay, timing

The two pieces of CD4541 can compose a long time delay timing circuit. Its delay time can reach 10 h, even several days or months. Its composition is as shown. (View)

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Adjustable circulating timing controller circuit

Published:2011/4/19 22:53:00 Author:Jessie | Keyword: Adjustable, circulating timing controller

Adjustable circulating timing controller circuit
The timing controller uses the LCD's minute signals. After the combination oftwo level separate frequency circuit, it can build a multi-level timing control function. It composes single timing open/shut or automatic cycle working mode by the control switch. Control time from1 ~ 90min is adjustable. Circuit's components areas shown. (View)

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Atlanta electromagnetism circuit

Published:2011/4/20 1:33:00 Author:Jessie | Keyword: electromagnetism

Atlanta electromagnetism circuit
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Push-pull AB class 1 stereo amplifier BEZ-T8B circuit

Published:2011/4/20 1:32:00 Author:Jessie | Keyword: AB class 1, stereo amplifier

Push-pull AB class 1 stereo amplifier BEZ-T8B circuit
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LC172 acousto-optic dual control 4-phase pulse distribution color lamp control circuit

Published:2011/4/20 0:24:00 Author:Nicole | Keyword: acousto-optic dual control, 4-phase pulse, color lamp

LC172 acousto-optic dual control 4-phase pulse distribution color lamp control circuit
The circuit is as shown. It is composed of audio amplifier, acousto-optic dual control switch, light control circuit and AC depressurization rectifier circuit. 4-phase pulse distribution light control special IC LC172 is made as the core to consist the light control circuit. (View)

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Touch music color lamp circuit(BH-SK-I)

Published:2011/4/19 22:39:00 Author:Nicole | Keyword: music color lamp

Touch music color lamp circuit(BH-SK-I)
The circuit is as shown. It is composed of touch switch, SCR trigger circuit, music phonation circuit and AC depressurization rectifier circuit. BH-SK—I(IC1) is a sound control IC, it uses internal bistable state trigger as switch, to control the color lamp on or off. When the sheetmetal M is touched, the body inductive clutter singals are added to input terminal I foot of IC1 amplifier, after the singals are enlarged and shaped, selected frequency, triggered bistable state trigger by IC1, its 12 foot will output about 5V high level. This high level jumping singal outputs two roads: one is added to VT1, then VT1, VS turn on, to light up the color lamp series H1～Hn; the other is added to the trigger terminal TG of IC2 by R4, to make the trigger phonate. (View)

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AC color lamp control circuit composed of LC181 audio modulation color lamp control chip

Published:2011/4/19 21:56:00 Author:Nicole | Keyword: AC color lamp, control chip

AC color lamp control circuit composed of LC181 audio modulation color lamp control chip
The cycle frequency is 0.5~1Hz. LED cycles flashing slowly. When connected the audio modulation singal, the cycle speed of LED will change with the audio singal, if the cycle frequency is 1Hz, then the highest modulation rate is more than 15 times. To change the value of RC, it can change the cycle speed without modulation singal. This circuit is suitable for all kinds of artwares, vases, painted screen and so on. (View)

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Incandescent lamp life extension switch circuit(5)

Published:2011/4/19 21:43:00 Author:Nicole | Keyword: incandescent lamp, life extension

The figure is as shown, it is another connection way of the incandescent lamp life extension switch, it has two functions: one is it can start up with half wave depressurization when it is connected to the power supply, then it will turn into total pressure feeding after the filament preheats enough; the other is this circuit will transfer to half wave depressurization feeding automatically, once the mains power network voltage is 20V higher than the 220V standard voltage, it can delay the service life of incandescent lamp effectively. (View)

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Showcase or bulletin board timing light controllor circuit (2)

Published:2011/4/19 20:35:00 Author:Nicole | Keyword: showcase or bulletin board, timing light, controllor

The figure is as shown, it is a showcase or bulletin board timing light controllor adopts two electronic tables control, 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. K uses small middle power electromagnetic relay such as JZC-22F、DC12V, the maximum load of contact is 5A. (View)

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Timer circuit with monostable free sending device

Published:2011/4/19 20:27:00 Author:Nicole | Keyword: timer, free sending device

Timer circuit with monostable free sending device
The feature of this circuit is the input terminal has anti-interference protection measures, to avoid wrong actions due to the interference signal. Besides, the time process is finished before switch S off, it can increase the reliability. (View)

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Wideband square wave signal generator composed of CD4046

Published:2011/4/19 22:24:00 Author:Ecco | Keyword: Wideband , square wave , signal generator

Wideband square wave signal generator composed of CD4046
CD4046 operating frequency is up to 1MHz, it is set by parameters of external RC, it can form a wide band square wave signal generator, the circuit is as shown. (View)