Circuit Diagram

the circuit of fish breeding oxygen gaining controller（1）

Published:2011/6/27 8:46:00 Author:Ariel Wang | Keyword: fish breeding , oxygen gaining, controller

The 220V AC voltage is reduced by T,commutated by VD1～VD4,filtered by C1 and regulated by IC1.It provides +12V working voltage for the timimg control circuit.The +12V voltage lights VL by R1 after it is current limited.S is the control selector switch.When S is at the position of 1 ,the pin-2 and pin-6 of IC2 output high level.The pin-3 outputs low level.V is stopped.K is released.The electric motor of oxygen producing pump M stops working.When S is at the position of 2 ,the pin-2 and pin-6 of IC2 output low level.The pin-3 outputs high level.V is saturated to conduct.K is conducted to pull in.The normally open contact is connected.The electric motor of oxygen producing pump M keeps working.   (View)

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the circuit of fish breeding oxygen gaining controller（3）

Published:2011/6/26 9:08:00 Author:Ariel Wang | Keyword: fish breeding , oxygen gaining , controller

When S1 and S3 are disconnected,S2 and S4 are connected,the pin-1 of IC(the Q12 end) outputs low level,the pin-2 outputs high level.VT and V1 are conducted.K is conducted to pull in.The normally open contact is connected.The oxygen-producing device is conducted to work.At the same time,V2 is stopped.VL dies out.When the pin-1 and the pin-2 of IC output low level.The pin-3 outputs high level.VT and V1 are stopped.K is released.The normally open contact is disconneted.The oxygen-producing device is power-off.And it stopps working.   (View)

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the control circuit of the temperature controller(12)

Published:2011/6/26 5:00:00 Author:Ariel Wang | Keyword: temperature controller, control

When the mains switch S2 gets through,the 220V AC voltage is reduced by T,commutated by VD1,filtered by C4,regulated by V1 and V2.It provides +12V working voltage for IC and VLC2.At the same time,it lights VL by R3.When the power supply is on,the temperature in the hatching house is lower than the set temperature.The resistence of the temperature sensor RT is large.The pin-6 of IC(output end) outputs high level as the voltage of pin-3(the non-inverting termina) is higher than the voltage of pin-2(the inverting termina).V2 is conducted.The LEDs in YLC1 and YLC2 are lighted. The photodiode is conducted.VT is triggered to conduct.The electric heater EH is conducted to work.   (View)

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the control circuit of the common electric motor(2)

Published:2011/6/25 21:09:00 Author:Ariel Wang | Keyword: control circuit, common, electric motor

The main circuit of the electric motor consists of Q,FU,the normally open main contact KM1 of KM and thermoelement of the thermal relay KR.The control circuit consists of S,KM,KA1,KA2 and the normally closed contact of KR.When you want to start it,the knife switches need to get through.When S is pressed,KA1 is conducted to pull in.The normally open contacts KAI-1 and KAI-3 get through.The normally closed contact KAI-2 is disconnected.KM is conducted to pull in.The normally open main contact KM1 and the normally open auxiliary contact KM3 and KM4 are connected.M starts to work.When S is disconnected.KA1 is released.KM stays pull-in as the contact KM4 is working.You can press S again when you want to stop it,KA2 is conducted to pull in.The normally open contact KA2-2 is connected.The normally closed contact KA2-1 and KA2-3 are disconnected.KM is released.M stops working.   (View)

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the control circuit of the common electric motor(4)

Published:2011/6/25 20:13:00 Author:Ariel Wang | Keyword: control, common, electric motor

When you use it,Q and 51 need to get through.Then KM and KT1 are conducted to pull in.M works.After it works for a while,the normally open contact of KT1 which is delayed to close makes KA and KT2 conduct to pull in.And the normally closed contact of KA is disconnected.KA is released.The normally closed contact of KA is connected.KM and KT1 are conducted to pull in.M works.It goes on and on,M works at an interval time.If S2 is pressed when KM is released and M stops working,KM is pulled in.M starts to work immediately.   (View)

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the control circuit of the temperature controller(15)

Published:2011/6/25 20:01:00 Author:Ariel Wang | Keyword: control, temperature controller

When the mains switch S gets through,temperature detection wireless transmission circuit is conducted to work.When the enviroment temperature in the controlled place is lower than the controll temperature set by RP1.The resistence of RT increased to a certain value,IC1 outputs low level.The not gate D1 of IC2's in-circuit outputs high level.It charges C2.When C2 is fully charged(about 1s).Not gate D2 outputs positive pulse.The pin-11 of IC3 outputs code signal.It is emitted by IC4's modulation.After IC5 recieves the modulated code signal emitted by IC4,it is decoded by IC6.The pin-11 of IC6 outputs steady high level.V is saturated to conduct.K is conducted to pull in.The electric heater EH is conducted to heat.   (View)

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T-type low-pass filter with three component circuit

Published:2011/6/20 5:50:00 Author:John | Keyword: low-pass filter

T-type low-pass filter with three component circuit is shown.   (View)

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Oxidation-reduction for ozone in the water concentration monitor hardware circuit

Published:2011/6/20 5:46:00 Author:John | Keyword: concentration monitor

The circuit mainly includes: single-chip’s main control part, signal acquisition and processing, display part, keyboard part, alarm circuits and two control outputs. The hardware circuit to achieve the automatic measurement of ozone concentrations is to achieve the pick-up of signals. ORP sensor is used here, whose output signals are directly into the amplifier AD620. AD620 is a differential input amplifier, which is with zero drift. Its input resistance is 1 × 1010Ω, which can meet the needs of ORP sensor. It also can achieve the impedance conversion function.   (View)

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LTC1043 frequency control gain amplifier circuit

Published:2011/6/20 5:34:00 Author:John | Keyword: gain amplifier

The figure shows gain amplifier circuit controlled by frequency. Different input clock frequencies are used to control the amplifier’s gain circuit, thus being called the frequency gain control circuit. Figure (a) shows that the circuit consists of two parts: analog switch and integrated amplifier. Analog switch consists of two pieces of precision capacitor switches LTC1043 and integrated amplifier uses the JFET input type op-amp LT1056.   (View)

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ISO122 programmable gain isolation amplifier circuit

Published:2011/6/20 0:10:00 Author:John | Keyword: isolation amplifier

The figure shows the programmable gain isolation amplifier circuit. The circuit makes use of the isolation amplifier ISO122’s isolation performance and PGA102’s programmable gain controlling function. It also uses a two-way digital coupler ISO150 with isolation performance, in order to achieve the isolation for the input / output signals and gain control signals. Figure (b) is the internal block diagram for the ISO122.   (View)

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Cascaded MMIC amplifier circuit

Published:2011/6/20 0:05:00 Author:John | Keyword: amplifier

We must realize that MIC has different sizes of gain for the frequency range from DC to microwave region. For all cascaded amplifiers, we must prevent feedback between the different levels. Two factors must be noted here. Firstly, pay attention to the structure and layout as usual. External MIC input and output circuit must be physically isolated to prevent the coupling feedback. Secondly, DC power cord is needed for a decoupling of two or more stages. Signal on the DC power line are easy to be coupled between the different levels, causing unwanted feedback.   (View)

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Reader and transponder 2ASK modem circuit

Published:2011/6/19 23:54:00 Author:John | Keyword: modem, Reader, transponder

2ASK’s carrier signal is 2MHz sine wave. It achieves crystal of the square wave through a low pass filter. Digital modulation signal is output from the CPU's serial port and the signals are controlled to on or off through the analog switch MX7501, resulting in 2ASK signals. L1, L2, C1 and C2 constitute the second-order Butterworth low-pass filter, whose output is approximately sine wave’s 2 MHz signals. R1 and R4 lead to the matching of the LC filter impedance. When EN is 0, the OUT is 0; vice versa for the S1 channel signal. The following figure shows the reader’s 2ASK modulation circuit.   (View)

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RF input receiver with bandpass filter switch circuit

Published:2011/6/21 0:05:00 Author:John | Keyword: RF input receiver, bandpass filter, switch

RF input receiver with bandpass filter switch circuit is shown.   (View)

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PIN diode with band-pass filter switch circuit

Published:2011/6/19 10:56:00 Author:John | Keyword: diode, band-pass filter, switch

The picture shows how to choose a variety of band-pass filters in the circuit, for which only the DC signal lines are between the panel and the circuit. Input end and output end shown in the figure all have PIN diode. The PIN diodes are all powered by +12 V selected by the switch S1 or-12V DC power supply. When the switch is in the position shown, +12 V powers filter 1’s switch and the filter 1 works. When the switch is in the opposite position, the other filters work. This method can also be used for receiver’s front-end or local oscillator in order that different frequency bands can be selected for different LC components. figure: PIN diode with band-pass filter switch circuit   (View)

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the control circuit of the common electric motor(5)

Published:2011/6/25 20:14:00 Author:Ariel Wang | Keyword: control, common , electric motor

When the circuit is installed,you should install 51 abd S2,53 and 54,55 and 56 at three places.At the first place,when 51 is pressed,KM is conducted to pull in.The normally open contact is conducted.M works.When 52 is pressed,KM is released.M stops working.In the same way,when 52 is pressed at the second place or when 55 is pressed at the third place,KM will pull in.M works.When 54 or 56 is pressed.KM will release.M stops working.In this way,the electric motor can be controlled at three places.If you want to have more places to be controlled,you can just connect normally open control button in parallel or connect normally closed control button in series.   (View)

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Voltage-tuned NE-602 oscillator circuit

Published:2011/6/19 4:58:00 Author:John | Keyword: oscillator

Figure shows a pair of tuned circuits. The capacitor unit is the variable voltage capacitor diode or varactor VFO circuit. Diode display equivalent of junction capacitance for its upon reverse bias. Thus, the frequency of the oscillator circuit can be controlled by the tuning voltage Vt. NE-602 is a RF chip with good performance. It can be used in a variety of receivers, converters, oscillators, signal generators and other equipment. figure: Voltage-tuned NE-602 oscillator circuit   (View)

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the circuit of temperature controller(16)

Published:2011/6/25 19:20:00 Author:Ariel Wang | Keyword: temperature controller

When the mains switch gets through,the 220V AC voltage is reduced by T,commutated by RU,filtered by C1 and regulated by IC.Then it generates +12 voltage.It is for the temperature detect control circuit.At the same time,VL is lighted by R.When you use it,you can set the upper limit and lower limit of temperature by the thermelometer Q.When the controlled temperature is lower than the lower limit of the temperature,the moving contact of Q is connected with the contactor of the lower limit.The relay K1 and KM are conducted to pull in. EH is conducted to heat.When the temperature rises,the moving contact of Q is disconnected with the contactor of the lower limit.But as the normally open contacts K1-1 of K1 is closed,K1 and KM stay pull-in.EH stays conducted.   (View)

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the circuit of temperature controller(17)

Published:2011/6/23 6:54:00 Author:Ariel Wang | Keyword: temperature controller

The 220V AC voltage is reduced by C2,regulated by VS,commutated by YD and filtered BY c2.It provides 11.3V DC working voltage for the temperater control circuit.RP is used to set the control temperature value.When the environment temperature in the controlled place is detected lower than the set temperature by RT,the in-circuit of IC works.VT is conducted.The electric heater EH is conducted to work.The resistence of RT becomes lower when the temperature becomes higher.When the controlled temperature becomes the temperature set by RP,the in-circuit of IC stops working.VT is stopped.EH stops heating.When the temperature becomes lower than the set temperature,VT is conducted again.EH is conducted to work.   (View)

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PIN diode switch circuit

Published:2011/6/19 10:48:00 Author:John | Keyword: diode, switch

In the circuit shown in Figure (a), the diode Dy and the signal line are used in series. When the diode conducts, the signal path is with low resistance. When the diode closes, it presents a high resistance (so as to achieve the switching function). When the switch S opens, the diode is not biased. The circuit has been disconnected because of the diode’s impedance. When S closes, the diode is forward biased and the resistance of signal channel is very low. The impedance ratio by the state of opening and closing is a measure of isolation for the circuit.   (View)

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LM3886 production amplifier circuit

Published:2011/6/19 4:00:00 Author:John | Keyword: amplifier

LM3886 is used to make amplifier. LM3886 is a National Semiconductor’s high-fidelity power amplifier IC with over-voltage protection and over-temperature protection. Its external circuit is simple and easy to make. Its performance is as follows: VCC = ± 28V OUTPUT = 68W/4Ω, 38W/8Ω VCC = ± 35V OUTPUT = 50W/8Ω peak power: 135W SNR ≥ 92db conversion rate: 19V/us intermodulation distortion: 0.04% 11-lead TO -220 mute function SPiKeTM protection LM3886 comes in two models: LM3886TF and LM3886T. The former one is with insulated heat sink and the latter one is not insulated.   (View)

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