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Comparator Circuit

Published:2011/5/17 9:10:00 Author:Robert | Keyword: Comparator

The Comparator Circuit is shown in the picture below. Picture (1) is basic circuit. Picture (2) is hysteresis and non-sensitive zone. Picture (3) is the output waveform with no hysteresis. Picture (4) is output waveform with hysteresis. (View)

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Current Flowing After Boot Circuit (2)

Published:2011/5/17 8:53:00 Author:Robert | Keyword: Current Flowing, Boot

The Current Flowing After Boot Circuit (2) is shown below. (View)

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TL494 Internal function block diagram and basic unit circuit diagram

Published:2011/5/15 8:47:00 Author:Rebekka | Keyword: Internal function block diagram, basic unit circuit

TL494 Internal function block diagram and basic unit circuit diagram
The system uses a PWM generator TL494 producd by Texas Instruments.It is a typical fixed-frequency PWM control IC, which contains all the required control switching power supply function. It can be used as a single-ended forward double tube, half bridge type, full bridge type switching power supply control system, the basic circuit units is shown as above. (View)

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Application input end zeroing circuit diagram

Published:2011/5/17 1:43:00 Author:Rebekka | Keyword: Application input end , zeroing circuit

Application input end zeroing circuit diagram
In figure (a), it uses a small resistor R5 connecting in the return circuit of R1, the offset voltage produced by R5 and R3 are added to the left end of R1.And the voltage will be divided by R1 and R2. So the offset voltage adjustment range is determined by the following formula: Offset voltage adjustment range = ± VD · (R5/R3) · (R2 / (Rl + R2)) (± VD = ± l5V). According to the resistance value shown in figure (a) , the offset voltage adjustment range is: ± 15mV. R1 = R2. Therefore, the voltage gain of the circuit is low. Taking the R5 and R1 are in series into account , the voltage gain Av: Av = 1 + R2 / (Rl + R5) (View)

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Automatic hand dryer 4

Published:2011/5/16 21:54:00 Author:Nicole | Keyword: hand dryer

Automatic hand dryer 4
The circuit work theory This automatic hand dryer circuit is composed of power supply, infrared transmitting circuit, infrared signal process circuit, electric heater circuit and fan control circuit, the circuit is shown in the figure 9-127. The power supply circuit is made of fuse FU, power switch S, power transformer T, rectifier diodes VD1-VD4, filter capacitors C1, C5, C6, resistor R13, power indication LED VL1 and three terminal regulator integrated circuit IC3. The infrared transmitting circuit is made of infrared LED VU, resistors R7, R8, capacitor RP4, capacitor C4 and time base integrated circuit IC2. (View)

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Automatic hand dryer 1

Published:2011/5/16 21:25:00 Author:Nicole | Keyword: hand dryer

Automatic hand dryer 1
The circuit work theory This infrared automatic hand dryer circuit is composed of power supply, infrared transmitting circuit, infrared receiving amplifier circuit, delay circuit and air heater control circuit, the circuit is shown in the figure 9-124. The power supply is made of power supply switch S, depressurization capacitor C1, resistors R1, R2, voltage stabilizing diode VS, rectifier diode VD1, filter capacitor C2 and power indication LED VL1. The infrared transmitting circuit is made of not gate integrated circuit IC(D1-D5) internal not gate D1, D2, resistors R3-R6, capacitor C3, transistor V1 and infrared LED VL2. (View)

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Automatic hand dryer 2

Published:2011/5/16 21:46:00 Author:Nicole | Keyword: hand dryer

Automatic hand dryer 2
The circuit work theory This automatic hand dryer circuit is composed of power supply, infrared transmitting circuit, infrared receiving amplifier circuit, detector circuit and control circuit, the circuit is shown in the figure 9-125. The power supply is made of fuse FU, power transformer T, bridge rectifier UR, filter capacitor C1-C4 and three terminal regulator integrated circuit IC1. The infrared transmitting circuit consists of time base integrated circuit IC2, resistors R1, R2, capacitors C5, C6, potentiometer RP and infrared LED VL1. The infrared receiving amplifier circuit is composed of infrared photosensitive diode VD4, resistors R7-RlO, capacitors C8, C9 and operational amplifier integrated circuit IC3(Nl、N2)internal N1. (View)

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Automatic hand dryer 3

Published:2011/5/16 21:46:00 Author:Nicole | Keyword: hand dryer

Automatic hand dryer 3
The circuit work theory This automatic hand dryer circuit is composed of power supply, optical control circuit and control implement circuit, the circuit is shown in the figure 9-126. The power supply circuit is made of depressurization capacitor C1, bleeder resistor R1, voltage stabilizing diode VS, rectifier diode UD1 and filter capacitor C2. The optical control circuit is made of indicator light HL, light dependent resistor RG, resistor, capacitors C3, C4, potentiometer RP and time base integrated circuit IC. The control implement circuit consists of relay K, diode VD2, heating wire EH and fan motor M. (View)

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Automatic hand dryer 5

Published:2011/5/16 21:12:00 Author:Nicole | Keyword: hand dryer

Automatic hand dryer 5
The circuit work theory This automatic hand dryer circuit is composed of power supply, infrared control circuit and hot air generation circuit, the circuit is shown in the figure 9-128. The power supply is made of power supply switch S, depressurization capacitor C1, resistor R1, bridge rectifier UR1, filter capacitor C2 and voltage stabilizing diode VS. The infrared control circuit consists of current limiting resistor R2, infrared LED VL, infrared photosensitive diode VD1, potentiometer RP, electronic switch integrated circuit IC, diode VD2 and relay K. The hot air generation circuit is composed of K often open contact, heater EH, bridge rectifier UR2 and fan motor M. (View)