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Index 8

Closed-loop three-phase multivibrator oscillator circuit diagram

Published:2012/7/11 1:37:00 Author:Ecco | Keyword: Closed-loop, three-phase multivibrator

Closed-loop three-phase multivibrator oscillator circuit diagram

As shown in the figure,the closed loop is composed of three identical Schmitt triggers connnectedend to end. Each trigger's delay timetd = l . 1 (RP + R) C,and td is the time required by voltage on C to rise to 1/3 VDD. After 555 resets, the charge on C is dischared by formerIC output ( pin 3 ) through R, W, and thus the charging time constant is the same with C's. Once each trigger circuit's output endneeds to change, it requires to be transmitted three single stable trigger circuits, and the required time is 3td Therefore, the output cycle of each IC Td = 6td . The corresponding frequencyis (View)

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Rf driver audio oscillator circuit diagram

Published:2012/7/11 1:22:00 Author:Ecco | Keyword: Rf driver, audio oscillator

Rf driver audio oscillator circuit diagram
As shown in the figure, 555, Rl, RPland C1form thecontrolled audio oscillator , f = 1.44 / ( R1 +2 RP1) C1 , the icon parameter frequency isbetween 600Hz ~ 20kHz , and it can beselected by adjusting RP1. (View)

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5kHz electric eye oscillation circuit

Published:2011/12/1 21:27:00 Author:May | Keyword: 5kHz, electric eye, oscillation

5kHz electric eye oscillation circuit
This circuit can generate 5kHz, 5V pulse only when electric eye is shined by its incidental LED. Repeat frequency changes along with illumination intensity. So the break off or weaken of optical line can generate frequency variation. This frequency variation is easy to detect. It can be usedfor controlling signal. This circuit can be applied to invalidation-safe interrupt monitor and illumination transducer. If the beam isinterrupted completely, or very strong optical line shines on electric eye, the circuit stops oscillation. (View)

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Crystal oscillator circuit using operational amplifier

Published:2011/10/31 2:07:00 Author:May | Keyword: crystal oscillator, operational amplifier

Crystal oscillator circuit using operational amplifier
This circuit uses 761 operational amplifier, and theoutput pulse frequency can reach 10MHz. The 2KΩ resistor isused as operational amplifier output stage collector's load. (View)

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The multivibrator circuit diagram with thyristor

Published:2011/10/31 2:14:00 Author:May | Keyword: multivibrator, thyristor

The multivibrator circuit diagram with thyristor
The circuit can produce 50V rectangular pulse, and its duty cycle T1 / (T1 + T2) canreach from 0.001 to 0.999 bycontinuously adjusting. This can be achieved by choosing the proper R3 and R5. Capacitor C1 and resistor R5can decide thefrequency, then the duty cycle is 50%. (View)

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The monostable multivibrator

Published:2011/11/22 21:52:00 Author:Ecco | Keyword: Monostable multivibrator

The monostable multivibrator
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4GHZ oscillator circuit diagram composed of BFR34A transistor

Published:2011/12/8 20:21:00 Author:Ecco | Keyword: 4GHZ, oscillator, transistor

4GHZ oscillator circuit diagram composed of BFR34A transistor
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45MHz FET oscillator circuit

Published:2011/11/28 0:57:00 Author:Ecco | Keyword: 45MHz , FET oscillator

45MHz FET oscillator circuit
The circuit's quartz crystal is between the source and drain of field effect transistor. The operating point is determined by the source resistor. Inductor and capacitor form a series resonant circuit. (View)

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The crystal oscillator circuit with frequency in 2MHz

Published:2011/11/28 0:53:00 Author:Ecco | Keyword: crystal oscillator , 2MHz

The crystal oscillator circuit with frequency in 2MHz
Figure (a) and (b) show the two 2MHZ basic oscillator circuits. According to the circuit structure, it can adjust its best operating point by testing. (View)

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Logarithmic sweep voltage controlled oscillator

Published:2011/11/28 0:31:00 Author:Ecco | Keyword: Logarithmic, sweep , voltage controlled oscillator

Logarithmic sweep voltage controlled oscillator
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The sine wave oscillator using LM386

Published:2011/11/24 20:49:00 Author:Ecco | Keyword: sine wave oscillator

The chart shows the sinusoidal oscillator circuit using LM386; the circuit uses the Wien bridge oscillator method, and the distortion factor of output signal of is very low. Small bulb H and resistor R3 form the negative feedback circuit, which makes sure that the signal amplitude output by oscillator is stable and has low distortion. When the capacitors C1, C2 values are the same , and they use the icon data, the sinusoidal frequency is 1KHz. When it is in actual production , H can select 3V, 15mA small bulb. (View)

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Parallel resonant crystal oscillator composed of Gate circuit

Published:2011/11/27 20:28:00 Author:Ecco | Keyword: Parallel resonant , crystal oscillator , Gate circuit

Parallel resonant crystal oscillator composed of Gate circuit
When the quartz crystal under the action of the applied voltage, it will produce a piezoelectric effect, then the quartz crystal produces the mechanical vibrations, when the frequency of the applied voltage and crystal's natural oscillation is the same, the crystal 's mechanical amplitude is the largest and the alternating electric field will be largest to form piezoelectric resonator. The reactance frequency characteristics of quartz crystal reactance show that it has two closed resonance volume ratio, one is the series resonant frequency , the other one is parallel resonant frequency , when the crystal is in series resonance, the reactance is minimum, when it is in parallel resonance, the reactance is maximum, when it is between two frequency ranges, the crystal shows inductive , when it is free from two frequency ranges, the crystal shows capacitive. (View)