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Index 1728

The high-voltage generator (555)

Published:2011/6/22 1:10:00 Author:Borg | Keyword: high-voltage generator

The high-voltage generator (555)
In the figure is the high-voltage generator circuit. This kind of circuit is used in conditions that need high-voltage and low-current, and it can generates high voltages of several thousand and dozens of thousands of volts. The circuit consists of the pulse generator, drive and high voltage transformer. The pulse generator is connected serially with VT1 by a 555 timer. As the buffer, VT1 separates high load resistance of IC1 and IC2 grid. The resistors of R1, R3, R2 and R4 adjust the output pulse frequency of ICI 3-pin.The pulse controls the ON/OFF action of VT3 (View)

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The AC regulated circuit

Published:2011/6/19 8:51:00 Author:Seven | Keyword: regulated circuit

The AC regulated circuit
(View)

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The variode FM modulation circut

Published:2011/6/19 10:17:00 Author:Seven | Keyword: FM modulation circut

The variode FM modulation circut
In the circuit, VT1 magnifies the signal generated by the electret capacitance microphone to the value of the VDc working voltage. The LC oscillating circuit, which is composed of VT2 and so on, generates a 80MHz signal. L1 is the oscillating coil with magnetic cores, which can set the value of the oscillating frequency at 76～90MHz. The frequency of the resonance circuit is changed by the variode VDc, and the frequency is FM modulated directly, when the microphone outputs a 3mV current, we can get a ±25kHz MOD. The FM modulation signal is magnified to about 2.3mV by VT3 and then emitted to the sky by the aerial. (View)

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The single channel amplifier circuit

Published:2011/6/22 1:11:00 Author:Borg | Keyword: single channel, amplifier

The single channel amplifier circuit (View)

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The DC high voltage generator

Published:2011/6/22 1:16:00 Author:Borg | Keyword: DC, high voltage

In the figure is the DC high voltage generator. It is a small-sized high voltage DC generator, which can generate the DC voltage of 10000V. (View)

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The DC passive high voltage generator

Published:2011/6/22 1:28:00 Author:Borg | Keyword: DC passive, high voltage

The DC passive high voltage generator
The figured DC passive high voltage generator is specially designed for the high voltage static electricity spraying equipment. The circuit is small-sized and low-power, and its output passive high voltage is stable and adjustable, its maximum output DC is 100,000v. It has functions of overloading protection self-stopping and self-recovering. Elements selecting: T1 is a 30～40W and 2×24V power supply transformer. T2 and T3 are the push transformer of the black-white TV. T4 is the separated line output transformer of 17 inch black-white TV. TV5 can be chosen as 3DDl5D, 3JL06 and so on. RP1 is the multi-turn potentiometer of 20K12. (View)

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The OCL stereo sound power amplifier circuit

Published:2011/6/21 21:34:00 Author:qqtang | Keyword: stereo sound, power amplifier

The OCL stereo sound power amplifier circuit is shown as above. (View)

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The block frequency reducing circuit of capacitors (wide band reaction signal regulator 1B31)

Published:2011/6/23 1:06:00 Author:qqtang | Keyword: block frequency, wide band

The block frequency reducing circuit of capacitors (wide band reaction signal regulator 1B31)

By the external capacitors CSEL1 and CSEL2, the block frequency of the low-pass filter can be set under 1KHz, which can meet the narrow band need, see as the figure. The capacitance computing formula is as follows. (View)

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The timer circuit used by TV sets

Published:2011/6/23 6:51:00 Author:qqtang | Keyword: timer circuit

In the circuit is the timer circuit used by TV sets. In the circuit, the current transformer T2 is used to test the current in the power wires while the TV is working, the output of T2 is added on the input terminal of op-amp A1. To prevent A1 from being broken by over input, VD1, VD2, R1 and R2 are used to share the voltage and fulfill the function of protection. R3 provides with a bias voltage which is higher than 7mV for A1, when there is a AC in T2, A1 is outputting a low LEV, the the current is a changing DC, as the time constants of A4 and C1 is large, so A2 is outputting a low LEV while there is a AC in T2. (View)

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Notch filter with variable Q circuit

Published:2011/6/21 0:53:00 Author:John | Keyword: Notch filter

Notch filter with variable Q circuit is shown. (View)

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LM387 voice filter circuit

Published:2011/6/15 5:08:00 Author:John | Keyword: voice filter

LM387 voice filter circuit
Serial voice filter with a range of voice frequency circuit is shown in the following figure. And its frequency ranges from 360Hz to 3KHz. (View)

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Fourth-order low-pass filter circuit

Published:2011/6/15 10:24:00 Author:John | Keyword: Fourth-order low-pass filter

Fourth-order low-pass filter circuit
The figure shows a circuit which uses a high-level low-pass filter composed of a piece of LM348 four-operational amplifier. For example, if fc = 20kHz, filter transferring coefficient is counted as H0 = 1, Q01 = 0.541, Q02 = 1.306. Only one current source (LM334Z) is needed to be equipped with the filter because this filter can lead to the same product calculation for four amplifiers within band-pass amplification factor. Potentiometers RP can be used for precision adjustment. (View)

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The block frequency rising (wide band reaction signal regulator 1B31) circuit with resistors

Published:2011/6/23 11:24:00 Author:qqtang | Keyword: block frequency, signal regulator, resistor

The block frequency rising (wide band reaction signal regulator 1B31) circuit with resistors

By 3 external resistors, the block frequency can be risen from 1KHz to 20KHz, which can meet the need of wide band. The circuit is shown in the figure. The resistance value computing formulais as follows: In the formula, the unit of RSEL1～RSEL3 is kΩ. Besides, the resistance valuecan be chosen according to the table. (View)

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The vehicle battery inverter circuit

Published:2011/6/19 8:55:00 Author:Seven | Keyword: vehicle battery, inverter

The vehicle battery inverter circuit is shown in the figure. (View)

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the simple LED driver circuit

Published:2011/6/19 8:56:00 Author:Seven | Keyword: LED driver

the simple LED driver circuit
(View)

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The STK4181 application circuit

Published:2011/6/19 9:43:00 Author:Seven | Keyword: application circuit

The STK4181 application circuit is shown in the figure. (View)

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The MCl45027 typical application circuit (2)

Published:2011/6/19 9:57:00 Author:Seven | Keyword: typical application circuit

The MCl45027 typical application circuit (2) The range of external element values (View)

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The MCl45027 typical application circuit (1)

Published:2011/6/19 8:53:00 Author:Seven | Keyword: typical application circuit

The MCl45027 typical application circuit (1) (View)

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The time accumulation circuit

Published:2011/6/22 6:40:00 Author:qqtang | Keyword: time accumulation

In the figure is the time accumulation circuit. In the circuit, H1 and H2 are vibrations generated by the switch, when the switch of S1 is pressed, it generates a passive pulse and triggers HD14027, and its 1-pin (Q terminal) outputs a high LEV, and the LEV is added on the input terminal of the timer by H3, H4 and VT1, then the timing is starting. ICM7555 composes the multi-resonance oscillator, by changing the RP2, the oscillating frequency is adjusted, the output pulse of the 3-pin of ICM7555 is also added on the input terminal of H3, then the timer begins to time the pulses. When the timing is over, press S1, which generates the passive pulse and triggers HD14027. (View)