The infrared circuit principle diagram

Published:2011/6/23 2:43:00 Author:qqtang | Keyword: infrared circuit, principle diagram

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Pulse generator circuit uses the interrupt beam

Published:2011/6/22 3:47:00 Author:TaoXi | Keyword: Pulse generator, interrupt beam

When the object on the band carrier keeps out the light, this circuit will output a pulse. The light source makes the photoelectric transistor to keep in the conduction state. This will produce a high logic level voltage on the Schmitt inverter, and it also produces the low logic level voltage on the pin-5 of the monostable circuit which is compatible with the TTL. When the object keeps out the light, the TIL81 turns off the Schmitt inverter to trigger the monostable circuit.   (View)

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Temperature compensation circuit composed of the piezoresistive pressure sensor

Published:2011/6/22 21:13:00 Author:TaoXi | Keyword: Temperature, compensation circuit, piezoresistive, pressure sensor

In order to solve the problem of temperature drift, you usually use the constant current source power supply mode. But because the reasons of production process.etc, the resistances of the bridge are not the same, they have the zero position output. So even we use the constant current source power supply mode, there will still be a certain temperature error. The piezoresistive pressure sensor has the temperature drift phenomena, and the sensitivity changes with the temperature. You can use add the thermistor in the bridge circuit to solve the zero drift of the pressure sensor. As the figure shows, the RT is the thermistor which is mainly used to compensate for the zero drift; the RP can be used to adjust the zero position output.   (View)

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The key ring wireless encoding remote control circuit (2)

Published:2011/6/23 2:04:00 Author:qqtang | Keyword: key ring, wireless encoding, remote control

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The remote control emitting component CS900 circuit

Published:2011/6/22 3:11:00 Author:Borg | Keyword: remote control, emitteing component

Figure: The remote control emitting component CS900 circuit   (View)

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The precise triangular wave oscillator circuit

Published:2011/6/22 2:50:00 Author:Borg | Keyword: precise, triangular wave, oscillator

The precise triangular wave oscillator circuit is shown as above.   (View)

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The principle diagram of photocoupler application circuit

Published:2011/6/20 0:55:00 Author:Seven | Keyword: principle diagram, application circuit

The principle diagram of photocoupler application circuit is shown in the figure.   (View)

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The analytical circuit of the multi-function remote alarm controller

Published:2011/6/21 22:41:00 Author:qqtang | Keyword: analytical circuit, multi-function, remote

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The key ring wireless encoding remote control circuit (1)

Published:2011/6/21 22:32:00 Author:qqtang | Keyword: key ring, remote control

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50Hz rectangular wave generator circuit

Published:2011/6/13 6:59:00 Author:Christina | Keyword: 50Hz, rectangular wave, generator

The figure shows the Schmidt shaping circuit that changes the sinusoidal voltage into the rectangular wave. The sinusoidal voltage which is reduced by the transformer adds to the base electrode of VT1 directly. In the positive half cycle of the alternating current, the diode VD conducts, the base electrode electric potential of VT1 is positive, so the VT1 cuts off, VT2 conducts. In the negative half cycle of the alternating current, the base electrode electric potential of VT1 is negative, VT1 conducts and the 5OHz rectangular wave is output by the collector electrode of VT2. Figure The 50Hz rectangular wave generator circuit   (View)

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The simple ore radio circuit

Published:2011/6/21 6:25:00 Author:qqtang | Keyword: ore radio

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The key ring type wireless encoding remote control circuit (2)

Published:2011/6/19 21:18:00 Author:qqtang | Keyword: key ring type, remote control

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The full-wave control circuit of the serially connected motor

Published:2011/6/19 21:07:00 Author:qqtang | Keyword: full-wave control, serially connected motor

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The nerve muscle therapeutic apparatus circuit

Published:2011/6/19 21:05:00 Author:qqtang | Keyword: therapeutic apparatus

The nerve muscle therapeutic apparatus circuit is suitable for middle/old people, office people,high physical labourers and athletes, which has certain function on acute/chronic around nerve illness, muscle injury and muscle strain, etc.Working principle: the circuit is shown in the figure. CD4060 is a time sequence frequency distributor with a oscillator. The frequency of the oscillator is decided by C1,R10,R11 and W1, by adjusting W1, the oscillating frequency can be changes, so that the rhythm of the massage can be changed. After the oscillating signal is split from the inside.   (View)

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The 1～20MHz clock mixer circuit

Published:2011/6/19 21:31:00 Author:qqtang | Keyword: clock mixer

In the figure is the 1～20MHz clock mixer circuit which can generate precise clock signals. UoA outputs the 1～20MHz signal whose resolution ratio is 100KHz, but UoB and UoC output signals whose frequency is 1/10 of the former. If the input signal Ui is 10KHz, which is got by splitting the crystal circuit, then the precision is the same as the crystal oscillator.   (View)

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The MB1570 circuit

Published:2011/6/19 21:38:00 Author:qqtang | Keyword: circuit

In the figure is the example of the MB1570 circuit, which is a Pl－I mixer integrated circuit, and the band width is 26Hz.   (View)

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The DC sector reverser power circuit of active clamping resonance

Published:2011/6/19 8:20:00 Author:Seven | Keyword: DC sector, active clamping resonance

The DC sector reverser power circuit of active clamping resonance is shown in the figure.   (View)

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The digital frequency doubler of square wave output formed by MIC74121

Published:2011/6/17 9:28:00 Author:Borg | Keyword: digital frequency doubler, square wave

In the figure is the digital frequency doubler of square wave output. Usually, a digital frequency doubler works by the 2 output narrow pulses which are generated by the front-end and rear-end of the input pulse. In figure (a) is a basic frequency doubler circuit, A1, A2 and B are the triggering front-end of the single stable multi-resonance oscillator (MIC74121). Only when either of A1 and A2 is 1 , the other is 0 and B is 1 is the circuit triggered. After the rising edge of the input signal goes along td (the transiting time delay of the phase inverter), the single steady multi-resonance oscillator is triggered.   (View)

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The rectangle pulse frequency doubler

Published:2011/6/17 9:01:00 Author:Borg | Keyword: rectangle pulse, frequency doubler

In the figure is the rectangle pulse frequency doubler circuit. This circuit is a digital frequency doubler, which consists of a 6-inverting-phaser MC840P, 2 diodes and a capacitor, and its working frequency is 1Hz~100KHz. The input signal of the circuit is a square wave, and the output is an approximately symmetric rectangle wave. The required capacitive reactance of capacitor C at the frequency is 1kΩ. If the required output is a symmetric square wave, we can connect the capacitor with a resistor in serial or parallel way. The output circuit includes the phase inverters of G3, G4, G5 and G6, and they are coupled by the diodes of D1 and D2.   (View)

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The 150-300MHz frequency multiplier composed of MC1596

Published:2011/6/17 20:13:00 Author:Borg | Keyword: frequency multiplier

In the figure is the 150-300MHz frequency multiplier. The circuit is made of MC1596 balance modem, whose input frequency is 150MHz and the output frequency is 300MHz. MC1596 has two frequency input terminals(1-pin and 4-pin), and the 150MHZ frequency is added on the two terminals. By adjusting the 50kΩ potentiometer, the two terminals receive the same signal. By adjusting the 2 1~10pF adjustable capacitor, the output frequency will be precisely be twice of the input frequency and the distortion is reduced to the minimum. The input and output impedance are approximate 50Ω.   (View)

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