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Index 237

Optical control automatic rice distribution machine circuit

Published:2011/4/29 22:25:00 Author:Nicole | Keyword: optical control, rice distribution machine

Optical control automatic rice distribution machine circuit
According to the quantity of purchased rice, such as 15kg, you can push 15kg button, to make the tractive magnet which controls the counter poise move, then the 15kg counter poise automatically falling; according to the kinds of japonica rice or indica rice, to push kinds button, it can control the food-importing port of japonica rice or indica rice gate open, then the rice flow to the funnel of platform scale. Fixing source bulb and light-sensive diode in the vane of platform scale, ater it is amplified, the relay will take action to drive tractive magnet work. When it is nearly the wanted quantity, the steelyard will close the food-importing port, the rice is added from the small gate; then the steelyard rises slowly, when it reaches the standard, the light source is cut off, relay closes the small gate, the standard singal light on. To push the released rice button, the electromagnet of platform scale's delivery gate pulls up, then the rice will flow into haversack. (View)

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Opto-electrical range acquisition circuit

Published:2011/4/24 5:05:00 Author:Nicole | Keyword: opto-electrical range acquisition circuit

Opto-electrical range acquisition circuit
This circuit is composed of transmitter(a) and receiver(2), they are put side by side. Transmitter emits optical pulse, the light is reflected by the measured object and then received by the receiver. It has proportional relationship to the distance of measured object and the degree of received optical singal. In transmitter circuit, IC14047 is monostable trigger, it produces 10kHz square wave, the frequency is decided by R1, C1, the duty ratio is 50%. By T1, T2, this square wave drives LD271 to emit optical pulse. (View)

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Opto-electrical adjustment circuit

Published:2011/4/22 21:36:00 Author:Nicole | Keyword: opto-electrical adjustment circuit

Opto-electrical adjustment circuit
This circuit can be used to adjust a high voltage power supply. Indicator light #327 is connected to the output terminal of high voltage rectifier, its brightness changes in relation to output voltage. When the output voltage of high voltage rectifier is too high, the brightness of indicator light increases, the resistance of phototube Q3 reduces, Q1 collector current increases, Q2 collector current decreases, the frequency of unijunction transistor oscillation circuit composed of 2N4870 and C1 drops, limited by the frequency response of pulse transformer T1, MAC14 grid can not reach the trigger level, when the AC singal is zero passage, the light turns off automatically. The primary current of transformer T2 is reduced by R1 branch, then the output voltage of high voltage rectifier drops. The feature of this circuit is to isolate the regulator from the dangerous high voltage. (View)

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Regulated power supply circuit diagram used VMOS as switching element

Published:2011/4/8 2:38:00 Author:Nicole | Keyword: regulated power supply, switching element

Regulated power supply circuit diagram used VMOS as switching element
As shown, it is a power supply circuit used VMOS as switching element. VT5 is VMOS power transistor, the switch adjustment element of power supply; L1is the energy storage inductor; VD3 for the freewheeling diode; VT3 for the FET, as the constant current source of VTl, VT2, to provide the emitter with lmA constant current; Cl is the input filter capacitor; C5, C6, C7 is the output filter capacitor. It is determined by the relative voltage of the two base to turn on VTl or VT2 first. If the base potential of VT1 below VT2, the VTl on, VT2 off; on the contrary, the VTl off, VT2 on. The base potential of VT2 is decided by resistances R2, R3 and voltage regulator diode VD1, it is a constant; and base potential of VTl is obtained from the output voltage through the resistor R6C R, and derived from the potentiometer R8, the output voltage can be changed by adjusting potentiometer R8. In order to reduce the power consumption of switch regulator VT5, to improve its turning speed, the circuit adopts bootstrap network which composed of R5, C4. When VT5 is off, the source potential is 0V, the input voltage charge to C4 through diode VD2 resistor R4, so that the voltage on C4 is close to the input voltage. When VT5 is on, the source potential rise, as there is sufficient voltage on the capacitor C4, so that the diode VD2 off, by this time, the voltage on R5 is close to 2 times the input voltage, so VT5 turn on more quickly. At this point even if the input voltage is low, the circuit also can be flipped. The role of C2, C3 is to make VT1, VT2 flip quickly, then to improve the speed of switching. (View)

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Separately excited switching power supply circuit diagram using single-junction transistor as pulse generator

Published:2011/4/27 9:06:00 Author:Nicole | Keyword: switching power supply, single-junction transistor, pulse generator

Separately excited switching power supply circuit diagram using single-junction transistor as pulse generator
In figure: VD1 ~ VD4 and C1 is rectifying filter circuit, turning 220V AC network voltage into 300V DC voltage. Pulse generator consists of an unijunction transistor VT1, resistors R3, R4, R5, potentiometer RP and capacitor C3, to change the potentiometer's resistance can lead to the changing of pulse frequency. C4 is the coupling capacitor of output pulse. Rl and R2 divide 300V DC voltage to unijunction transistor VT1 and provide 20 ~ 30V operating voltage. VT2 is the inversion amplifier tube, it can invert and amplify the positive pulse outputed by pulse generator, transporting a negative pulse to switch VT4, so that it is ended when VT1 outputs positive pulse. (View)

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Pulse width modulated switching power supply circuit with stabilized voltage

Published:2011/4/27 9:05:00 Author:Nicole | Keyword: switching power supply, pulse width modulated

Pulse width modulated switching power supply circuit with stabilized voltage
As shown, the main technical indicators are as follows: Output voltage: 12V; Output Current: 1A; power consumption <20W; efficiency> 64%; internal resistance <0.075Ω; ripple <15mV; mains voltage: 160 ~ 240V. Inthe figure, full-wave rectifier circuit is composed of 6VDl, 6VD2; 6C3 is the filter capacitor; 6C1, 6C2 areused to undermine the surge current; self-excited multivibrator is composed of 6VT1, 6VT2, 6VT3 and 6R4, 6C9, and the 6VT1 also is the switching tube. When the 12V output voltage decreases for some reason, the base of the error amplification 6VT4 obtained the voltage from the sampling circuit 6R6, 6R11, 6R8 also will be dropped, the collector voltage of 6VT4 rose, the potential base of 6VT3 also increased, the output pulse of the switch adjustment 6VT1 broadened, then the reduced voltage rising again. On the contrary, when the output voltage drops, it will make a reverse adjustment according to the aboveprocess, then keeping the output voltage steady. (View)

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electric bicycle battery charger UC3842 circuit diagram

Published:2011/5/4 9:34:00 Author:Nancy | Keyword: electric bicycle, battery charger

electric bicycle battery charger UC3842 circuit diagram
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WYSE VGA-670 display power supply circuit diagram

Published:2011/5/4 9:52:00 Author:Nancy | Keyword: WYSE, display, power supply

WYSE VGA-670 display power supply circuit diagram
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VOLTRON V-1501 display power supply circuit diagram

Published:2011/5/4 9:54:00 Author:Nancy | Keyword: VOLTRON, display, power supply

VOLTRON V-1501 display power supply circuit diagram
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VGA V-1415 display power supply circuit diagram

Published:2011/5/4 9:55:00 Author:Nancy | Keyword: VGA , display, power supply

VGA V-1415 display power supply circuit diagram
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PWB-1509 color display power supply circuit diagram

Published:2011/5/4 10:14:00 Author:Nancy | Keyword: color display , power supply

PWB-1509 color display power supply circuit diagram
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PMV-P-14VC display power supply circuit diagram

Published:2011/5/4 10:17:00 Author:Nancy | Keyword: display, power supply

PMV-P-14VC display power supply circuit diagram
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TDA4605 thick film switching power supply IC diagram

Published:2011/5/4 2:11:00 Author:Ecco | Keyword: thick film, switching power supply, IC

TDA4605 thick film switching power supply IC diagram is produced by Philips, which is widely used in domestic and imported large screen color TV and color display. TDA4605 integrated circuit includes voltage regulator sampling processing circuit, under voltage protection detection circuit, the excitation pulse output circuit, soft start control circuit, its internal circuit diagram shown in Figure 1 million. The 8-pin IC-style packaging million, the pin functions and data listed in Table 1. Figure 1 TDA4605 integrated circuit within the circuit block diagram Table 1 showsTDA4605 integrated circuit pin functions and data (View)

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LED zero-beat indicating circuit

Published:2011/4/13 4:08:00 Author:Nicole | Keyword: LED, zero-beat indicating

LED zero-beat indicating circuit
Two LEDs are connected with opposite polarity, it depends on the receiver accurate tune to the emission signal to display the zero-beat frequency conveniently and intuitively. When deviate beyond zero-beat frequency1kHz, two LEDs are conduction all the time; when deviate in zero-beat frequency 20Hz, two LEDs are flashing; when beat is in ±5Hz, LEDs are extinction. The luminous intensity of LED is determined by low-frequency response of the adopted audio amplifier. (View)

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Single power supply change into dual power supply circuit

Published:2011/5/3 6:19:00 Author:Christina | Keyword: Single power supply, dual power supply

Single power supply change into dual power supply circuit
In the circuit, time base circuit 555 connected as an astable circuit (pin-3's output frequency is 20 KHz, duty cycle is 1:1). When the pin-3 is high level voltage, C4 is charged by the electric current; when the pin-3 is low level voltage, C3 is charged by the electric current. Because of the presence of VD1, VD2, the C3, C4 can be charged by the current, but can not be discharged, the maximum charge value is EC, if you connect the B to ground, you will get the +/-EC dual power at both ends of A, C. This circuit's output current is more than 50 mA. (View)