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Oscillator Circuit

Index 52

The multivibrator circuit with variable pitch

Published:2011/4/18 0:40:00 Author:Ecco | Keyword: multivibrator , variable pitch

The multivibrator circuit with variable pitch is composed of two 555 time base circuits, it can issue wave of oscillation changed in 400～2500Hz, and its sound is similar to the sound of the public security police. The circuit consists of power-delay, low-frequency oscillator and the modulation generator. (View)

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Linear vco(8038、μA741)

Published:2011/4/14 22:46:00 Author:Ecco | Keyword: Linear , vco

Linear vco(8038、μA741)
The linear voltage-controlled oscillator circuit is shown as the chart. In the figure, A1 is a constant current source circuit which is used to improve charging and discharging characteristics of C1. It makes a linear relationship between the output frequency and the input control voltage. A2 is a sine wave output buffer. If inputting the low-frequency sawtooth to the control voltage terminal, the circuit will become a linear sweep generator. But putting a signal voltage on input terminal will make the circuit output frequency modulation wave. The circuit can be used as an A / D converter changing a digital signal into the voltage with a frequency counter counting the output. Linear VCO is also known as V / F converter. (View)

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RF driver audio oscillator

Published:2011/4/14 3:24:00 Author:Ecco | Keyword: RF driver, audio oscillator

RF driver audio oscillator
As shown, 555 and Rl, RPl, C1 and other components form controllable audio oscillator, f = 1.44 / (R1 +2 RP1) C1, the frequency of parameter in the diagram is between 600Hz ~ 20kHz, it can be adjustedby RP1. (View)

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Data-controlled variable frequency oscillator

Published:2011/4/14 3:25:00 Author:Ecco | Keyword: Data-controlled, variable frequency , oscillator

Data-controlled variable frequency oscillator
As shown, toaccess 11-bit binary data(highlevel is 1 , low level is 0 )on the base bias circuit of VT1~VT11, there are 2048 combinations. When one pointis in low level, the corresponding VT tube is conducted, the C2 charges through the RA + R2. RAis the equivalent resistance of the resistor connecting to each conducting tube. (View)

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Multivibrator with symmetric wave output

Published:2011/4/14 3:40:00 Author:Ecco | Keyword: Symmetric wave , output, multivibrator

Multivibrator with symmetric wave output

The chart is as shown. Comparing with the general multivibrator, it adds a biased transistor VT1 to the charging circuit. VT1 can be fully conducted in the effect of R2; When C1 discharges, it will be completely closed. As the forward resistance is low(less than hundreds ohm) when VT1 switch and germanium diode arein the conducting state, it has little influence on charging and discharging time. Another advantage of this circuit is thatthe loading change has a minimal impact on the output voltage amplitude, duty cycle and oscillation frequency. (View)

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The controlled oscillator composed of Nand gate

Published:2011/4/7 3:32:00 Author:Ecco | Keyword: controlled oscillator, NOT gate

The controlled oscillator composed of Nand gate
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LC oscillator composed of NAND gate

Published:2011/4/7 3:32:00 Author:Ecco | Keyword: LC oscillator , NAND gate

LC oscillator composed of NAND gate
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Wien oscillator regulator

Published:2011/4/14 2:52:00 Author:Ecco | Keyword: wien , oscillator , regulator

Wien oscillator regulator
In the Wien bridge, to change any resistance will change the frequency and attenuation. As shown, by adjusting the resistance can change the gain of the amplifier and compensate for the attenuation. (View)

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The separate excitation crossover multivibrator

Published:2011/4/14 2:39:00 Author:Ecco | Keyword: separate excitation, crossover, multivibrator

The separate excitation crossover multivibrator is shown in the chart. It has two or four types of split-phase output waveform, and can easily obtain 0°,-90°,-180°, 270°split-phase square wave. It has the features of simple structure, good output waveform, eliminating the traditional frequency, counting, decoding circuit. It should be used in the phase generator, four-cycle water lantern controller circuit,etc. (View)

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The separate excitation crossover oscillator used in four recirculating water lantern controller

Published:2011/4/14 2:40:00 Author:Ecco | Keyword: separate excitation rossover oscillator, four recirculating , water lantern , controller

The figure shows the separate excitation crossover oscillator used in four recirculating water lantern controller, the circuit only adopts two sets of contactrelay 4088 to control the four water lanterns. The working principle: the six NOT gate CD4069 in ICl and C1, C2, Rl, R2 form the separate excitation crossover oscillator circuit, it controls the transistor VTl, VT2 directly and drives relays Kl, K2 for the cross-phase output, that is the after Kl pulls, then K2 pulls, and Kl disconnects, K2 then disconnects and go in the cycle. (B) shows the lantern connection diagram. (View)

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NC monostable multivibrator circuit

Published:2011/4/14 2:40:00 Author:Ecco | Keyword: NC, monostable , multivibrator

The NC monostable multivibrator circuit shown in the chart is composed of four 2 input NOR gate CC4001 and 14-bit binary serial counter / divider CC4020. It mainly used as time delay switch or timer in automatic control equipments. (View)

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Variable duty cycle monostable multivibrator composed of 74HCT221

Published:2011/4/13 3:17:00 Author:Ecco | Keyword: Variable duty cycle, monostable multivibrator

The chart shows the variable duty cycle monostable multivibrator composed of 74HCT221. Capacitor C is charged and discharged at the same rate, the duty cycle is 50%, the oscillation period T = RC. The R in figure (a) can be replaced by the map to get other desired duty cycle, during this time, Cl is charged by R1, and discharged by R2, the oscillation period T = (R1 + R2) C / 2, the duty cycle is approximately Rl / (R1 + R2). In the figure 9-11, VDl, VD2, VD3 is the 1N4148. (View)

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The multivibrator composed of CD4017

Published:2011/4/13 2:17:00 Author:Ecco | Keyword: multivibrator

The multivibrator composed of CD4017
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Rapid synchronous vco

Published:2011/4/12 22:52:00 Author:Ecco | Keyword: Rapid , synchronous, vco

Rapid synchronous vco
The main function of this circuit is to combine phase splitter and digital / analog converter, it can make the high stability VCO and the external reference frequency be precisely synchronized. (View)

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Special sound audio oscillator circuit(NE555、CD4017)

Published:2011/4/6 20:12:00 Author:Ecco | Keyword: Special sound , audio oscillator

Special sound audio oscillator circuit(NE555、CD4017)
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Linear voltage-controlled oscillator(555)

Published:2011/4/10 22:13:00 Author:Ecco | Keyword: Linear , voltage-controlled oscillator, 555

Linear voltage-controlled oscillator(555)
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Negative resistance LED oscillation circuit

Published:2011/4/10 22:38:00 Author:Nicole | Keyword: negative resistance, LED, oscillation

Negative resistance LED oscillation circuit
This circuit can cover 3.2~8.0 kHz frequency range. It can inspire the loudspeaker which is connected on X point. In oder to obtain lower frequency and large sound, it should change C1 into 1μF. The negative resistance part of this circuit consists of Q1, Q2, LED, R2 and R3. Optical isolator device is MCF-2 or equivalent component. (View)