![]() The proposed piezoelectric pump has the characteristics of simple structure, high performance, small size, and low cost, which can be applied in microelectronic cooling, biomedical, and other fields. In addition, at 70 Hz, 180Vpp, the comprehensive performance of the piezoelectric pump is better, with a flow rate above 3 ml/min and an output pressure over 35 kPa. The maximum flow rate of 4.5 ml/min is obtained when the pump is driven by an offset sinusoidal voltage of 180Vpp at 50 Hz the maximum output pressure of the pump reaches 52 kPa under 180Vpp at 150 Hz. ![]() The experimental results show that the pump has good self-suck ability under well-assembled process conditions, which provides a guarantee for the high flow rate and the output pressure of the piezoelectric pump. The corresponding experimental prototype was made for the output performance assessment. The working principle of the piezoelectric pump was described, and the theoretical working characteristics of the cantilever check valve were analyzed in detail. A single-chamber piezoelectric pump with a circular unimorph piezoelectric actuator and cantilever check valves is proposed in this work, which has good output performance and smaller overall size. PCB Design for the above explained DIY contact MIC circuitįollowing are the images of the DIY contact mic prototype, built and submitted by Mr.The high performance and miniaturization of the piezoelectric pump are essential for its application. This Capacitor blocks DC and passes only. With the gate negative and the Source positive, This output signal exits the amplifier through capacitor 4.7uF and appears across resistor 220k. Then the Source is more positive than the ground terminal. But we've connected the Source to Supply. Now the output comes out across the Source and ground. The gate is more negative than the ground terminal. Capacitor 4.7uF blocks the DC voltages in the circuit, but passes the amplified AC signal. The output signal appears between the Source and ground. In our case, the JFET gate voltage controls the JFET source current. Since the input signal controls the channel width.That is, a small signal controls a large signal. The source resistor 1.5K converts the current variations to voltage variations. For this reason, more or less current passes through the JFET. The varying gate signal causes the JFET's to vary. When we apply a signal, the input signal varies the negative bias voltage across resistor 560 Ω. Normally, the bias voltage across resistor 560 Ω holds the JFET channel at a medium resistance value. The signal enters JFET,which is a amplifying device.The difference between the source and the gate sets the voltage drop across resistor 560 Ω. The voltage drop across 3.3M is the input signal at the JFET gate. The signal enters the amplifier through gate resistor 3.3M. This is the recommended bias setting for most small-signal or analog audio amplifiers.It allows the maximum signal before distortion. This current sets the source voltage at a point halfway between the Supply and ground. Under no-signal conditions, bias voltage causes the JFET source to draw a very small current. The main Element used in the circuit is the MPF-102 Transistor. This terminal is the JFET drain terminal.įor this reason, we sometimes call this amplifier circuit a "common drain circuit”.The Drain resistor 220k is connected to the source to the battery's ground terminal. One terminal of this amplifier is common to both the input and output signals. This voltage is connected to the source through source resistor 1.5K. The battery supplies +9 volts which is connected to the source of the JFET device, MPF-102.
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