Circuit Diagram

60h timing circuit

Published:2011-12-1 21:39:00 Author:May | Keyword: 60h timing

This timer consists of three parts: power supply double 50Hz square wave generator, frequency dividing circuit, timing display. Its working volt is 5V. Its current is several milliampere. 5G7224A is 4 1/2 bit fully decoded counter driving LCD. It is 60 system and it can direct-coupling LCD. D1~D5 state each bit LCD drive line group. Switch K is used for controlling time/suspend ; Switch AN is used for controlling zero clearing .   (View)

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5kHz electric eye oscillation circuit

Published:2011-12-1 21:27:00 Author:May | Keyword: 5kHz, electric eye, oscillation

This circuit can generate 5kHz, 5V pulse only when electric eye is shined by its incidental LED. Repeat frequency changes along with illumination intensity. So the break off or weaken of optical line can generate frequency variation. This frequency variation is easy to detect. It can be usedfor controlling signal. This circuit can be applied to invalidation-safe interrupt monitor and illumination transducer. If the beam isinterrupted completely, or very strong optical line shines on electric eye, the circuit stops oscillation.   (View)

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BQ2000 charge controller

Published:2011-12-1 21:23:00 Author:May | Keyword: charge controller

BQ2000 charge controller is pioneer product currently inpower source technology field. It intergrates each element circuit charge controller needed in one IC. The arithmetic unit in the chip can make the whole circuit control be more precise, operation bemore safe, function be more complete. Its pin array is shown in the following diagram. The internal functional block diagram is shown in the following diagram:   (View)

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DS2762 pin array diagram

Published:2011-12-2 0:33:00 Author:May | Keyword: land patten

DS2762 is lithium ion battery monitor chip. It is produced by Maxin company. It can real-time monitor the parameter of voltage, current, charge and discharge condition and dump energy, etc. The chip can store this data. The chip can provide this data to SCM. And SCM can do relvant treat to the data. DS2762 chip cancollect data, store information. DS2762 chip hasthe features of functional integrity, external wiring simple and so on. Its pin array is shown in the following diagram.   (View)

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DS2438 used for measuring traction battery packs circuit

Published:2011-12-2 1:21:00 Author:May | Keyword: traction battery packs, measuring

Traction battery packs test chip produced by America Dallas company has rich function, and itis convenient to achieve monitoring the running state of electric motor car’s traction battery packs. DS2438 can beused for monitoring of various kinds of traction battery packs. The utility power used in electric motor car is traction battery packs composed of multiple power battery connecyed in series, parallel. The performance of each power battery directly affectsthe characteristic of whole traction battery packs. So in practical application, we should make on-line real-time detection to each power battery. And each power battery should connectwith a piece of DS2438, and their data terminal can be articulated to a bus. The power supply source of DS2438 can come from tested power battery itself. The potential of DS2438 signal end DQ is to the ground of this DS2438. The potential of reference ground is different, so it must cause the difference of potential of DS2438 signal end DQ inthe same reference point. It is shown in the diagram.   (View)

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Single chip switching power supply design

Published:2011-11-13 21:59:00 Author:May | Keyword: Single chip, switching, power supply, design

The typical application circuit of TOPSwitch series single chip switching power supply is shown in the diagram. High-frequency transformer in the circuit has three functions of energy storage, isolation output and voltage transformation. The diagram shows thatthe polarity of high frequency transformer primary winding Np is coincided with the opposite polarity of secondary winding Ns and the feedback winding NF. This indicates that the electrical energy is stored in the primary winding in the type of magnetic energy when TOPSwitch is broken over, and meanwhile VD2 is closed. When TOPSwitch is cut off, VD2 is broken over, energy will transfers to the secondary, namely, it is the features of fly-back switching power supply. In the diagram, BR is the rectifier bridge; Cin is the input end offilter capacitor. AC voltage u is rectified and filtered and then it will get DC high voltage V1. After passing the primary windings, it will add to the drain of TOPSwitch. In view of the TOPSwitch cut-off time, the spike voltage generated by drain of high frequency transformer can be superimposed on the DC high voltage V1 and the induced voltage Vor. It can make the brain voltage of power switching tube exceed 700V and damage the chip. So it must increase drain clamping protection circuit in the justified of primary winding.   (View)

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Small switching power supply module using TOP222P

Published:2011-11-13 21:34:00 Author:May | Keyword: Small switching, power supply

AC input voltage is 100~245V, double way DC output (note 1), the biggest output is separately 10V800mA, 5V800mA, and the power supply efficiency is 80%~89%. ( note 1: whenthe output is5V, this power supply module has the function of regulation voltage)   (View)

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34063 used for DC-DC supply convert circuit

Published:2011-12-1 20:17:00 Author:May | Keyword: DC-DC supply convert

34063 is a kind of intergrated circuit which is used for DC-DC power supply converter.It canbeused for voltage boost, step-down and polarity reversed. The highest polarity reversed effect is 90%, the highest step-down effect is 80%, conversion efficiency and work frequency filter capacitorare indirect proportion. Moreover, when output power can not reach therequired value, for example, when >250~300MA, it can enlarge current through the method of external expansion power tube, andambipolar or MOS expansion current tube is ok.The peripheral cell nominal meaning and their value computing formula:Vout (output value)=1.25V(1+R1/R2)Ct (timing capacitor):decide internal operating frequency. Ct=0.000004*Ton (work frequency)Ipk=2*Iomx*T/offRsc (current-limiting resistance):decide output current. Rsc=0.33/IpkLmin(inductance): Lmin=(Vimin-Vces)*Ton/IpkCo ( filter capacitor): decide output voltage ripple factor, Co=Io*ton/Vp-p(ripple factor)fixed value parameter:Vces=1.0V ton/toff=(Vo+Vf-Vimin)/(Vimin-Vces) Vimin: minimum value when input voltage unsteadinessVf=1.2V high-speed switch diode forward voltage drop   (View)

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The combination sine wave circuit of 400Hz LED and operational amplifier

Published:2011-11-10 0:09:00 Author:May | Keyword: sine wave, LED, operational amplifier, 400Hz

In dimensional calculation bridge circuit, LED with norlinear resistor usage and operational amplifier are used in combination, and the power supply voltage is 15V. If R,C values change, this circuit can work at other frequency. R can adjust output width and its range is 10~20Vp-p, and the circuit total harmonic distortion is 1%.   (View)

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4096 bits CCDP drive circuit

Published:2011-4-15 5:39:00 Author:May | Keyword: 4096 bits, CCDP drive

This diagram is NEC μPD791 type 4096 bits CCD drive circuit. 28MHz crystal oscillator can change according to CCD signal output speed. But 100kΩ potentiometer of lock-in oscillator should be adjusted accordingly. SP1, SP2 separately is corresponding signal. V1, V2 is sample hold pulse. CP1, CP2 separately is V1, V2 corresponding phase impulse.   (View)

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2-10 system decoding circuit

Published:2011-12-1 20:30:00 Author:May | Keyword: 2-10 system, decoding

RS7447 BCD code to seven-segment decoder can provide seven segment common anode digisplay. Binary system input pointer consists of RS7404 six inverter and four LED. It shows that input end uses binary system form to express ten's digit. It is suited to teach experiment.   (View)

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Test probe circuit

Published:2011-11-10 1:35:00 Author:May | Keyword: Test probe

This circuit can detect repeatability of bubart system level and pulse. Because indicator light drived by switch transistor Q3 is very light, whenthis probe is used as binary system level indicator,the not stored switch should be closed,it does notneed to press reset button switch continuously. When the main switch isput on aide position, peopel must use two input together. Cable extract from aide input jack should beconnected to logic circuit's second test point to inspect the two signal being consistent or not. All small signal diodes are 1N914, and the probe power current is about 160mA.   (View)

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Electronic stuttering appliance circuit

Published:2011-11-9 21:45:00 Author:May | Keyword: Electronic stuttering appliance

Electronic stuttering appliancecircuit is shown in the diagram, in fact, itis an electronic sound light metronome, and it utilizes rhythmed sound and light to stabilize emotion, and people will speak along with voice light rhythm to make them speak smooth gradually toreach the purpose to cure stammer. In order to easier making, this text uses cheap components. The triodes'β value in the principle circuit only needs to higher than 20. RP1 uses small type potentiometer with reading dial, RP2 uses theradio with switch volume potentiometer. Speaker's output connects toearphone, andthe complete appliance ispackaged in small box, and LED needs a pore to show it.   (View)

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Light gradually, gradually eliminate type lamp dimmer circuit

Published:2011-4-24 1:18:00 Author:May | Keyword: lamp dimmer

The diagram is lamp dimmer which has the function of light gradually, gradually eliminate. It does not appear the light stimulation of the human eye when the lights suddenly illuminated , and also can reduce the damage when open lamp impact current to the bulb, circuit is shown in the diagram. This circuit is LED driver circuit in optocoupler which consists of a six inverter circuit, in order to add the driver ability of the circuit, four inverters are use in parallel.   (View)

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Gas - smoke alarm circuit with Triac

Published:2011-8-29 1:34:00 Author:Jessie | Keyword: Gas - smoke alarm , Triac

When it appears combustible gas, the conductanceof gas sensor TGS308will increase.The voltageon potentiometer RP1 sliding points increases from normal 3V to 20V. This increased voltage is added to the transistor VT1 and makes it turn on by the diode and 4.7Ω resistor, then the Triac 2N6070A is turned on. Full-wave AC voltage drives H to produce 90dB sound and alarm. H is 24V AC Delta16003168 alarm. When the gas disappears from the sensor, the circuit recovers to its original state, so the alarm automatically stops.   (View)

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Night automatic lighting circuit with bidirectional thyristor

Published:2011-8-29 1:25:00 Author:Jessie | Keyword: bidirectional thyristor, lighting circuit

When the sunshine is very strong,light activated triode L14C1 will be connected. Diode VD3 is connected, which makes voltage of capacitor C2 decline to zero. Two-way trigger tube VD5 and two-way thyristor VT are not connected, the light is not on.   (View)

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Safe and reliable delay switch circuit

Published:2011-8-29 2:04:00 Author:Jessie | Keyword: delay switch circuit

It should use the safe and reliable delay switch circuit shown as the chart in the places with flammable and explosive materials. After pressing button S anda certain time, therelay is cut off. If in a given time, therelay doesn't release, so indicator La isextinguished and sent out the fault signal. Technical parameters: Working voltage: 24V; delay time(adjusted by R4): 3~15s.   (View)

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Delay switch circuit with thyristor

Published:2011-8-29 2:01:00 Author:Jessie | Keyword: delay switch circuit

Delay switch circuit with thyristorcan control the connect and disconnect of high-power appliances. The delaying accuracy of the Figure (a) depends on regulator. Figure (b) uses two-way diode A9903 or TV503 to replace the tetrode BRY20 in Figure (a). Technical parameters: 60V ± 10%; maximum load resistor RL: 860Ω, the minimum load resistor RL: 100Ω, delay time: 0.3 ~ 3.6S.   (View)

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Common transistor electronic relay for controlling base

Published:2011-8-29 1:54:00 Author:Jessie | Keyword: controlling base , transistor electronic relay

Figure A is the NPN transistor using + Ec electronic power control relay. Figure b is grounded NPN transistor control circuit. Figure c is the PNP transistor with Ec-controlled electronic relay. Figure d is the self-bias electronic relay.   (View)

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Four-stage Bessel low pass filter circuit diagram

Published:2011-7-28 0:45:00 Author:Nicole | Keyword: four-stage Bessel, low pass filter

  (View)

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