Signal Processing

Simple sinusoidal oscillator circuit

Published:2011/10/27 21:13:00 Author:May | Keyword: sinusoidal oscillator

It can change the frequency range, and the oscillating signal is adjusted by potentiometer RP1. Since the output resistance is very low ( 1KΩ),it issuitable for various kinds of control circuit as a source. In the circuit, the transistor's collector passesthrough R1, R2, C1, C2 to base to constitute feedback branch. Changing the device's parameters is OK.   (View)

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Threshold signal generator circuit using TcA965

Published:2011/10/27 21:19:00 Author:May | Keyword: Threshold signal generator

The circuit consists of multivibrator and threshold switch. The voltage of TCA965's pin 10 is decided by that of pin 6, pin 7, and pin 8, while the latter is determined by the bleeder R1~R4. The feedback is from pin 14 to pin 8 via R5. The unstable state occurs when the voltage of pin 9 is high enough. Then the circuit produces oscillation.   (View)

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50HZ time-base signal generator circuit diagram

Published:2011/10/26 21:57:00 Author:May | Keyword: 50HZ , time-base signal generator

The attached figure 1 is the 60Hz digit-clock time-base circuit composed of the 12-bit binary serial counter/frequency divider CD4040 and six phase reverser CD4069 and so on. In the circuit, the CD4069's gate I and gate II constitute the crystal oscillator with oscillating frequency in 32768Hz. Chart 2a is another kind of 60Hz pulse generating circuit. It consists of the integrated circuit CD4060 and crystal oscillator with the resonance frequency in 30720Hz. CD4060 is 14-bit binary serial counter, frequency divider and oscillator. The CD4060's interior divides into two parts, one part is 14-level counter/frequency divider, and its frequency division coefficient is 16¯16348.   (View)

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The monostable multivibrator

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

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Small electronic coupling oscillator circuit diagram

Published:2011/12/8 20:23:00 Author:Ecco | Keyword: Small , electronic coupling oscillator

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45MHz FET oscillator circuit

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

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

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

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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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Triangle wave - square wave generator circuit

Published:2011/11/24 20:53:00 Author:Ecco | Keyword: Triangle wave , square wave , generator

The circuit is composed of 3 operational amplifiers, and changing resistor R can change the frequency.   (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

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)

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The pulse generator circuit with sharp pulse and sawtooth pulse

Published:2011/11/27 21:05:00 Author:Ecco | Keyword: pulse generator , sharp pulse , sawtooth pulse

The upper limit of the two pulses' frequency generated by the gate circuit is 5MHZ, the lower limit depends on the size of the capacitor . Sharp pulse width is about 50ns, which is output directly from TTL and non gate; sawtooth pulse is generated by impedance converter, which is a Schmitt trigger with high input impedance, so that it has a good sawtooth linearity . Gate device substitution : FLH731-49713S, FLH491-49702.   (View)

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The pulse generator ( Figure 1.6 ) circuit with output multiple waveforms

Published:2011/11/27 20:49:00 Author:Ecco | Keyword: pulse generator , multiple waveforms

It uses the programmable unijunction transistor Th to form a pulse waveform generator circuit which can output multiple waveforms. Figure (b) shows the pulse waveforms output by a, b, c, d points which are shown in Figure (a) circuit. In this case, UB = 50V, pulse frequency f = 1000Hz, pulse peak U = UP = 20V. Component parameters R1 = 0.164MΩ, R2 = 0.256MΩ, R3 = 4.9MΩ, R4 or R5 = 8Ω, C = 410pF.   (View)

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The crystal oscillator with switch

Published:2011/11/24 21:30:00 Author:Ecco | Keyword: crystal oscillator , switch

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Adjustable crystal oscillator

Published:2011/11/24 21:30:00 Author:Ecco | Keyword: Adjustable crystal oscillator

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Crystal l00kHz interval calibration oscillator

Published:2011/11/27 20:42:00 Author:Ecco | Keyword: Crystal , l00kHz , interval calibration , oscillator

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Transistor- FET transistor oscillator

Published:2011/11/27 20:41:00 Author:Ecco | Keyword: Transistor, FET transistor , oscillator

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The audio signal generator circuit with low output resistance

Published:2011/11/28 21:01:00 Author:Ecco | Keyword: audio signal generator, low output resistance

As it is output from the emitter follower, the output resistance is very low. Output voltage can be decided by R1, R2 piezoelectric resistance. If you want to get sinusoidal signal without distortion, you can access resistor R3, its value is determined by the test adjustment. In the case of parameters, the frequency of the circuit is about 500Hz.   (View)

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Rectangular wave generator ( Figure 1.9 ) circuit

Published:2011/11/28 20:54:00 Author:Ecco | Keyword: Rectangular wave generator

In the circuit, T1, T2 form the oscillator, and T3 is the output stage. Network consists of high-pass filter (C3, C4, R6 + R7) and low-pass filter. Its output is added to T3 base by C6, R8 to get the required rectangular wave oscillation signal collector of T3.   (View)

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