Circuit Diagram

Special cultivation temperature control and wave-sound circuit

Published:2011/9/4 22:32:00 Author:TaoXi | Keyword: Special cultivation, temperature control, wave-sound circuit

As the figure shows, it is composed of the temperature sensing devices, the comparison circuit, the silicon controlled temperature control circuit, the wave- sound circuit and the AC step-down rectifier circuit. This circuit is simple, practical and it has the wide temperature range and high control precision.   (View)

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Infrared detection multiple-channel wireless alarm circuit TDC1808/TDC1809

Published:2011/9/4 22:34:00 Author:TaoXi | Keyword: Infrared, detection, multiple-channel, wireless, alarm circuit

Launch circuit: Receiving circuit:   (View)

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Wanbao BCD148 frost-free refrigerator circuit

Published:2011/9/4 21:26:00 Author:TaoXi | Keyword: Wanbao, frost-free, refrigerator circuit

In the figure, the EL is the 220V, 15W light, it is installed in the refrigeration room; 1SB is the refrigeration room door switch, if the door opens, the EL will turn on; 2SB is the freezer door switch, the fan electric motor M1 stops operating when the door opens; KT is the defrost timer; EH1 is the defrost heater, FU is the drainage electric heater.   (View)

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Temperature window overrun alarm circuit MAX6502/4

Published:2011/9/4 21:18:00 Author:TaoXi | Keyword: Temperature window, overrun, alarm circuit

The circuit is as shown in the figure, it is composed of the upper limit and lower limit temperature detection circuit, the voice circuit, the audio amplifier circuit and the AC step-down rectifier circuit. The temperature upper limit monitor uses the temperature switching integrated circuit MAX6502 to monitor, it can changes the temperature of the monitored objects into the corresponding electric signals, when the signal voltage exceeds the threshold temperature, the voltage comparator of the switch compares and adjudges the signal, and the monostable trigger outputs the plastic pulse, the push-pull output level outputs the high level control signal.   (View)

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Cultural relics museum metal detection volice alarm circuit

Published:2011/9/4 21:09:00 Author:TaoXi | Keyword: Cultural relics museum, metal detection, volice alarm

Some memorial halls, museums and treasure exhibition halls always have the unpleasant inspection to prevent the metal objects of the visitors. This circuit is installed at the entrance of the hall, it can detect the metal objects automatically and send out the voice of Please do not bring the metal products inside . This circuit is as shown in the figure.   (View)

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The piezoelectric type high material level automatic control and alarm circuit

Published:2011/9/4 21:01:00 Author:TaoXi | Keyword: piezoelectric type, high material level, automatic control, alarm circuit

As the figure shows, it is composed of the piezoelectric type material level, the relay control mechanical circuit, the analog sound circuit and the AC step-down rectifier circuit. When the material level rises to the high level, the circuit can send out the analog sound and cuts off the power supply of the material feeding equipment, so the material feeding stops to ensure the safety. IC1 is the piezoelectric type material level sensing integrated circuit, it is composed of the self-excited oscillator, the rectifier circuit, the voltage comparator circuit and the open-circuit output level, the internal circuit is as shown in the figure.   (View)

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3dd13 regulator constant current source circuit

Published:2011/9/4 20:30:00 Author:TaoXi | Keyword: regulator, constant current, source circuit

This is the numerical control constant current source that can be used to charge the storage battery. The D/A converter outputs a voltage value to the in-phase port of the op amp, the two ports of the current I=Uad/sampling resistor are used to connected with the + and - poles of the storage battery. The overhead op amp is connected into the amplifier circuit with the magnification of 1/4. This device is used to measure the voltage of the storage battery. The regulator 3dd13 is as shown in the figure.   (View)

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3dd15 regulator constant current source circuit

Published:2011/9/4 20:27:00 Author:TaoXi | Keyword: regulator, constant current, source circuit

This is the numerical control constant current source that can be used to charge the storage battery. The D/A converter outputs a voltage value to the in-phase port of the op amp, the two ports of the current I=Uad/sampling resistor are used to connected with the + and - poles of the storage battery. The overhead op amp is connected into the amplifier circuit with the magnification of 1/4. This device is used to measure the voltage of the storage battery. The regulator 3dd15 is as shown in the figure.   (View)

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Panasonic M12H power supply circuit

Published:2011/9/4 19:56:00 Author:TaoXi | Keyword: Panasonic, power supply circuit

Oscilation circuit The 300V DC voltage of the C836 adds to the C pole of the internal switching tube of the IC801's pin-1 through the primary windings P1 and P2 of the T801, and it adds to the B pole of the internal switching tube of the IC801's pin-2 through the R803, so the switching tube conducts. The current of E pole flows out from the pin-4 of IC801. The P1 and P2 winding current of T801 increases to produce the induced voltage, and this voltage is coupled with the F2 and F3 windings, the F2 has the positive induced voltage polarity, the F3 has the negative induced voltage polarity. This voltage adds to the pin-2 and pin-4 of the IC801 through the C806 and R804, so the switching current further increases, the strong positive feedback makes the switching tube saturated quickly.   (View)

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Hitachi NP8C power supply circuit

Published:2011/8/31 20:54:00 Author:TaoXi | Keyword: Hitachi, power supply circuit

Oscillation process The 300V DC voltage adds to the B pole of the switch tube Q901 through the R911, R907, R908, so the Q901 starts to conduct, the current flows through the primary winding of the T901, the Q901 produces the induced voltage, also the primary winding produces the induced voltage too. The voltage adds to the B pole of Q901 through the R902, R909, C908 to make the further conduction of Q901, the strong positive feedback makes the Q901 saturate rapidly. In the saturated period of Q901, the D906 and D907 conduct, the T901 stores the energy, at the same time the positive feedback voltage charges the C908, so the voltage of the Q901's B pole is declining until the voltage can not maintain the saturation of Q901.   (View)

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Panasonic L15 power supply circuit

Published:2011/9/4 19:48:00 Author:TaoXi | Keyword: Panasonic, power supply circuit

Oscilation circuit The 300V DC voltage of the C847 adds to the C pole of the internal switching tube of the IC801's pin-3 through the primary windings P1 and P2 of the energy storage transformer, and it adds to the B pole of the internal switching tube of the IC802's pin-2 through the R803, so the switching tube conducts. The winding voltage of P1 and P2 is coupled to the F2 and F3 windings to produce the positive feedback voltage, this voltage adds to the pin-2 and pin-4 of the IC801 through the C806 and R804, so the switching tube saturates rapidly. During the switch saturation period, the current flows out from the pin-4 of the IC801 and builds the 113V DC voltage on C808.   (View)

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Sanyo 83P power supply circuit

Published:2011/8/31 22:05:00 Author:TaoXi | Keyword: Sanyo, 83P, power supply circuit

Oscillation process: The 300V voltage of the positive port of C310 adds to the B pole of the switch tube BG311 through the R311 and R312, at the same time the No.4 and No.6 windings of the switching transformer B301 add to the C pole of BG311, the switch tube starts to conduct, the No.2 and No.3 windings of B301 produce the positive feedback voltage of No.2 positive and No.3 negative, this positive feedback voltage adds to the B pole of BG311 through the R335, D335, C333, the BG311 saturates rapidly. After the BG311 is saturated, the current of the No.4 and No.6 windings of B301 increases linearly, the B301 stores the magnetic energy. The E pole current of BG311 gets through the R330 and produces the linear-increasing sawtooth voltage on R330.   (View)

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SANYO 80P power supply circuit

Published:2011/8/31 21:54:00 Author:TaoXi | Keyword: SANYO, 80P, power supply circuit

Oscillation process The 300V DC voltage adds to the B pole of the switch tube Q504 through the R518, R519, the Q504 starts to conducts. The pin-9 and pin-10 of the T501 are the positive feedback winding, the pin-9 has the positive polarity and the pin-10 has the negative positive polarity, the voltage gets through the positive feedback which is composed of the B, E poles of Q504, the R516, R515 and D509 to make the Q504 saturate rapidly. After the Q504 is saturated, the primary winding current of T501 increases linearly, this current produces the sawtooth wave voltage-drop on the R514, the voltage-drop adds to the B pole of Q502 through the R505 and C507, the sawtooth wave voltage is superimposed on the 6.8V DC voltage of the B pole of the Q502, when the B pole voltage of Q502 is lower than a set value, the Q502 conducts to make the left port of C510 connect with the ground.   (View)

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Hitachi NP84C power supply circuit

Published:2011/8/31 21:08:00 Author:TaoXi | Keyword: Hitachi, power supply circuit

Oscillation process The 300V DC voltage adds to the B pole of the switch tube Q901 through the R902, R903, C905, so the Q901 starts to conduct, the current of the C pole flows through the pin-1 and pin-3 of the primary winding of the T901, the Q901 produces the induced voltage, also the pin-5 and pin-10 of the primary winding produces the induced voltage too. The voltage adds to the B pole of Q901 through the R905, C911, R906, C908 to make the further conduction of Q901, the strong positive feedback makes the Q901 saturate rapidly. In the saturated period of Q901, the winding current of the T901's pin-1 and pin-3 increases to build the 110 V DC voltage on C909. At the same time, in the saturated period of Q901, the C911 is charged constantly to make the B pole voltage of Q901 become smaller, at last the Q901 exits the saturated state.   (View)

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Automatic refrigerator protector

Published:2011/8/26 3:20:00 Author:Jessie | Keyword: refrigerator, protector

The automatic refrigerator protection line is simple with full function, reliable sensitive action, and it is useful accessory for refrigerator. When the 220V mains voltage is too low, the refrigerator motor may be damaged, R1 and RP1 partial pressure value decreases, so VD5 is conduction, then the integrated circuit IC turns on, VD7 stops, so the two-way thyristor VS is cut off, thereby the power of refrigerators cut off. RP1 can be set to adjust the undervoltage protection value. When the voltage is too high, it is possible to make the refrigerator motor overheating. RP2 can be set to adjust over-voltage protection value.   (View)

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Flow speed indicator circuit

Published:2011/8/26 3:12:00 Author:Jessie | Keyword: Flow speed, indicator

This circuit uses thermistors for load to measure flow. For a certain liquid medium, when its velocity is not the same, thermistors' cooling conditions are different neither, so itcan measure the liquid flow quantityor flow rate. In diagram, thermistors RH is put on the the arm of amplifier input bridge road, Bridge road unbalanced signal is detected by amplifierand become voltages, then it issent to the latter stage measurement amplifier or digital circuit to display.   (View)

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Delayed releasing relay

Published:2011/8/29 1:39:00 Author:Jessie | Keyword: Delayed releasing relay

Circuit's load is relay or electromagnet coils of wire,and it alsocan be usedas the signal lightdisplay and alarm device etc. When it turns on the power switch, the input bonus of inverse's operational amplifieris added toUT, while in-phase input capacitor C has not been charged, so voltage is negative. Technical parameters: Working voltage: UB = 12V ± 12% delay time: tV is about 260S Repeat Time: tw is about 12s switch power: 120w ~ 3.5kW.   (View)

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Delay pulling in relay circuit

Published:2011/8/29 2:26:00 Author:Jessie | Keyword: Delay pulling in , relay

If you want to get the delay circuit with long time and it iseasy to adjust,you should use the transistor to control relay current, and access RC on the base circuit, and the circuit is shown as the chart. If the supply voltage, capacitor, current amplification coefficient and the required pull-in power are known, you should select the appropriate relay coil resistance and voltage value in order to delay as long as possible. This time can be determined by the constant value of time.   (View)

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AC electronic relay circuit

Published:2011/8/29 2:21:00 Author:Jessie | Keyword: AC, electronic relay

As shown in Figure a , the collector is negative, the emitter is positive, and for the PNP tube, the powerwith this polarity is normal operating voltage. As shown in Figure b, the collector is positive, the emitter is negative, andfor NPN Tube, the powerwith this polarityis normal operating voltage.   (View)

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Relay delay pulling in circuit

Published:2011/8/29 1:45:00 Author:Jessie | Keyword: Relay , delay pulling in

Relay delay pulling in circuit is composedof theplane transistors BC107C, BC107B and some other external components. Since transistors have high current amplification coefficient and small collector current,the delay can reach 60s. If it requires lower, it should use the lower capacitors.   (View)

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