wien oscillator 1khz circuit

As is well known that oscillators bridge WIEN, used to generate sine wave signals at low frequencies. Basically consisting of a bass amp, which creates positive and negative feedback. A simplified bridge circuit WIEN seen in Fig. 1. The netting of positive feedback provides the frequency of oscillations. In the simplest case used the same resistors and capacitors, the oscillation frequency is: F = 1/2pRC (1). Increased step down from the panel of negative feedback and is calculated from the relationship: A = RA + RB / RA (2). To maintain the oscillations and synchronos not distorted output signal, enhancing the levels should be slightly higher than the degradation caused the netting of positive feedback. If used the same values ​​of resistors and capacitors in the field of positive feedback, support should be about 3. In practice, the setting of default in payment is made automatically by using a nonlinear element (incandescent lamp, thermistor, or other suitable circuit), which added to the negative feedback loop. In Fig. 2 we see the oscillator circuit. The amplifier has two steps in mating DC. The first step IC1 is an operational amplifier. The second is the output includes two complementary transistors Q1-Q2, a symmetrical arrangement, which allows the oscillator to lead loads greater than 50R. The non-linear element is needed for automatic adjustment of support, formed by the parallel combination of D1-2 and R1. The use of R1 in parallel with these diodes reduces the nonlinearity of the set and keeps a low level of deformation (1-5%), depending on the different parameters that have two channels. The frequency of the oscillations can grow up to 20KIZ without increasing the distortion and correspondingly reduced to low frequencies, provided the coupling is DC. With the materials that give the panel material, the oscillator generates frequency 1KHZ. The frequency can be changed by changing the values ​​of resistors and capacitors, avoiding electrolyte, suffices to keep the relationship R1 = R2 and C1 = C2. The capacity of the capacitor is calculated by F = F 1/2pRC where the output frequency. The current drawn by the circuit is between 10 and 50 mA, when the load is 50R. The supply is + /-9V and can be done by two batteries or by a simple steady power supply. To set the generator must use an oscilloscope, where you’ll see the waveform by adjusting the trimmer TR1, until we see the waveform, with less distortion. If there is an oscilloscope, then just put a 47R resistor in series with the output and a speaker 8W / 0.5W. Change the trimmer TR1 until we hear the oscillation in the loudspeaker, but to go a little longer to adjust trimmer.

Electronic Parts
R1= 1.5Kohm
R2= 12Kohm
R3-4-5= 10Kohm
R6= 2.7Kohm
R7-8= 10ohm
TR1= 10Kohm Trimmer
Q1= BC550C
Q2= BC560C
C1-2= 10nF 100V polyester
C-3= 100nF 100V
All R is metal film 1%
D1-4= 1N4148
IC1= TL071-NE5534-LM741

Ultra Low Frequency Receiver Circuit

The frequency of 0.1 Hz to 10Hz and 16Hz signals are received useful. The first operational amplifier, well screened, should be near the antenna (1-3m long) and be installed with the rest of the circuit with a 5-wire shielded cable.

Set the trimmer 100k, so that the DC-setting does not change the outcome of the OPA124, as the rotational speed of the 220k pot.

A low pass filter, which can range from a notch filter for the provision of the network was sound. The values in parentheses represent a 60 Hz. 1% of components must for the 3 resistors and 3 capacitors of the notch filters.

A voltage-controlled oscillator produces an audible frequency of the input signal follows and it is very useful when the portable device even though I made that just walking is enough to signal is buried felt. The output signal goes first to a meter and then to connect to a data logger, an almost essential part of the recipient is available.

The sensitivity is more than enough to be turning a TV discovered in the area. There are also numerous other mysterious signals of unknown origin. The input protection diodes are special low leakage type, and should not be replaced by standard diodes.

These diodes may be omitted if the antenna is carefully and away from strong electric fields to be installed. The diodes are on the meter Schottky diodes and an aversion to very small signals (mostly noise) are not connected will provide the data logger.

Pin connector for OPA124: 1 and 5: DC-Kit, 2 and 3: inverting and inverting, 6: Output, 8: substrate. Pin connector for LF412: 2 and 3: inverting and inverting, 1: Output, 5 and 6: inverting and inverting, 7: Output

RC Notch Filter (Twin T) Circuit

The two T-notch filter can be used to block unwanted frequencies or if placed in an op amp as a bandpass filter.

The notch frequency occurs where the capacitive reactance equals the resistance (Xc = R) and if the values are close, the attenuation can be very high and the notch frequency virtually eliminated.

Insertion of the filter depends on the load, the output is connected to the subject so that the resistors must be of much lower value than the load for minimal loss.

For audio frequencies, the filter may act as a bass and treble boost circuit by attenuating the midrange. With 1.5K resistors and capacitors 0.1 uF, the band is in stop-10dB 500 Hz to 2 kHz. The depth and breadth of the reaction can be slightly adjusted to a value of 0.5 R and adding some resistance at the C-values.

If the circuit is an operational amplifier is used as a bandpass filter, the response should be reduced to avoid oscillation.

Signal (or energy) transmitted through and reflected from a discontinuity

For the week ,I would like to present many Frequency circuit for developper who will take it use to test your electronic projects.

For this TDR circuit is simple and easy to use for electronic instrument to measure or test equipment of electronic projects

Power to the circuit
This circuit is best done with 4.5 V battery or three 1.5 V batteries in series. The + of the battery goes to IC1 pin 14 The pin 7 of IC1 is grounded circuit connected to the ground Circut. Remember, 100 nF (ceramic or polypropylene) ensure capacitor between pin 7 and 14 IC1 transfer to stable power supply for the circuit.
Circuit process
TDRS used in all phases of the life cycle of an onboard power and construction to maintenance and troubleshooting. Historically, the TDR for only large companies and a high level engineers is reserved. This was due to the complexity of the operation and the high cost of instruments.

Time Domain Reflectometer(TDR) Circuit

If a cable made of metal and has at least two conductors can be tested by a TDR. TDRS will be charged and measure all types of twisted pair and coax cable. TDRS locate major or minor cabling problems including; shorted sheath faults, broken pipes, water damage, loose connectors, crimps, cuts, broken wires, cables, system components, and a variety of other disorders. TDR can be used on the nature of the problem and in any place along the Calbe to locate the error.

TDR works on the same principle as radar. If the wrist at the end of the cable, or a fault in the cable, all is within or part of the pulse energy reflected back to the instrument. Any change in cable impedance is to reconsider some energy back toward the TDR and is displayed. What determines the impedance, the amplitude of the reflection. The TDR measures the time it takes for the signal to travel along the cable, see the problem, and reflection. The TDR reflected signal and then displays the information on the waveform display.

The circuit in this article will be used with a normal oscilloscope. Build the circuit on which it is used as the source and use the oscilloscope as a waveform monitor. Circuit diagram:

Time Domain Reflectometer(TDR) diagram

Function of the circuit.
1.Brief description of the operation: Pulse source for time-domain reflectometer
2.Circuit Protection: Output is short circuit proof
3.Circuit Complexity: Simple an IC design can be built on small pieces veroboard
4.Circuit performances: works very well with cable 5 meters to 500 meters (cable not tested, you must work for miles, according to the original article)
5.Availability component: most available components
6.Design test: on the track ideas in Electronic Design Magazine, 1 October, published in 1998. I own a custom built version of the show, which I use in this document. 7.The circuit is tested with a series of veins.
8.Applications: Cable fault location and cable transmission imepdance measurements.
9.Extra equipment required for operation: Oscilloscope needed to make all measurements.
10.Power supply: 4.5V battery
11.Output pulse amplitude: 4.5 Vpp to untermiated lines around 2.2Vpp terminated lines
12.Output pulse length adjustable from 10 ns to 5 us
13.Output Impedance: 50 ohms to 100 ohms adjustable from
14. Resolution: Better than 5 ns (about 1 meter cable)
15.Estimated component cost: about $ 20 including switches, housing, buttons
16.Safety considerations: No special security risks

Square Wave Generator (100Hz) circuit

A requirement in many applications is a spontaneous source of a series of continuous signal with a regular and definable waveform. One of the most important of these is a square wave.
   
The circuit on the right will control a comparator with positive and negative feedback to the output voltage. Since the negative feedback path uses a capacitor, while the positive feedback path, but there is a time change from the comparator triggered her condition. As a result, the circuit oscillates, or changes the status back and forth on a predictable price.

Three-phase 100Hz frequencies with 9V battery count, minimal parts

This simple circuit is a good and stable 1V peak to peak square wave at 100Hz, 1kHz and 10kHz with a single cell 1.5V power supply.
A useful feature of this circuit is that frequency changes can be achieved only by switching on a capacitor at a time.
The power consumption is about 600μA.

zener oscillator circuit

These two circuits are interesting from an academic point of view. Their practical implementation is rather critical and it is not easy to get steady operation. Circuit (a) requires a “cooked” zener: connect it first to a constant current generator, then increase the current until the voltage across the zener starts to decrease.

Reduce the supply current and wait a few minutes until it really warms up. The zener is now ready for the circuit: increase the voltage slowly until it oscillates (1KHz in the circuit shown). You may need to decrease the voltage once oscillation takes place. With suitable circuit components it will oscillate up to 20MHz. Circuit (b) will oscillate at a very low frequency, normally 2-5Hz, provided the voltage is increased very slowly, loading is critical and you may find that a slightly different lamp will work better.

    Higher voltage zeners work better than low voltage zeners and the circuits operate only with the specified types.

The reasons for the oscillations are unknown, although, for circuit (b) it is felt that some kind of reversible thermal breakdown is at work.

VCO circuit

Unijunction transistor are very interesting .They love to be used in oscillators,and it dosen’t take too many parts or very much coaxing  to get thrie sawtooth outout going.
This little squealer will tell you how much voltage it’s connected to. the higher the voltage, the lower frequency output you will hear.
5 or6 volts should start its high squcal going; 25 or 30 volts and it’ll be ticking like a metro-nome.You can take advantage of this voltage to frequency conversion and use this circuit as an audible volt-meter.Or,with a resitor across the input,it can be audible current meter.
For a slightly stranger effect,connect a large value capacitor(say 50 – 100 uF with a voltage rating larger than the voltage you intent to apply)
You’ll hear a swooping effect.Many differrent components can be placed across the input for differrent effects when voltage is applied,. Experiment and have fun.

SCR oscillater circuit

Silicon Rectifier (SCR) can easily oscillate if there is an inductor (a speaker coil in this case) that you just enough tension to bend more support to the current. critical in this way can begin a new cycle, and the oscillations in He works in a wide range of supply voltage and component values are not at all. Operating frequency of this circuit goes from 100 Hz to 10 kHz at 11V to 100V.

L1: 37 turns on T50-2 toroid
Source tap 12 turns up from earth

Coverage: 3-12 MHz approx.

Notes:
1. A vernier reduction drive is desirable.
2. Build signal generator in die cast aluminuim box for best stability.
3. Can work up to 148 MHz on harmonics if care is taken in construction.
4. any construction method should work but ensure components are rigid.

The resonator at the accumulator of the electronic transistor T3 is linked to the coil of the medium wave oscillator electronic transistor wireless, a secured 100pF capacitance C5 and the centre of a gang capacitance (C6) is formed.
The oscillator subdivision can easy for other intermediate-frequency filter with ceramic resonating chamber or be changed and that the T3 appropriate changes to the resonator at the collector of the electronic transistor. Little readjustment of the distorted shape caused by different values of resistances R6 and R7 be born on, if necessary.

PLL synthesizing oscillator with IC 4060B and 4522B Circuit

The IC 4522B is Programmable BCD Counter and IC4060B is 14 Bit binary counter and oscillator. IC4060B has the inverter for the oscillator and the 14-bit binary counter which divides the oscillator output. Make the circuit this time oscillate 4.096 MHz and it is using the output of the 12th bit (1/4096=1KHz) of the binary counter.

The VCO can vary by around 1 MHz. Minimum and maximum frequency determined by the value of R4, R5 and C4. Each relational expression is thus as below.

PLL synthesizing oscillator with IC MC145163 Circuit

Reference frequency
The circuit this time makes an oscillation frequency 10.24MHz.
Dividing ratio of the reference frequency
To change the frequency of the output by the dividing ratio of the comparison frequency in the 10KHz unit, the dividing ratio is fixing on 1024 at the circuit this time.

Dividing ratio of the comparison frequency
Because the 144-MHz bandwidth of the amateur radio is 2MHz(144.0MHz to 146.0MHz) in Japan, it makes the output frequency of the PLL 133.3MHz to 135.3MHz. (Frequency with the low of 10.7MHz)
The comparison frequency which is inputted to MC145163 is mixed with 119.3MHz by SN16913 and becomes 14MHz to 16MHz.
Because the phase comparison frequency is 10KHz, the dividing range of the comparative divider becomes 1400 to 1600.
The BCD specification value of 103 is fixed on 1 and the BCD specification value of 102 is made to be able to choose 4 or 5.

The BCD specification value of 102 becomes 0100 or 0101 when it is displayed by bits. The bit of 20 is made to be able to be changed into 0 or 1.101 and 100 specify 0 to 9 by the binary-coded decimal code.
The frequency of 200 channels can be specified by the 10KHz unit by above dividing ratio specification.

PLL synthesizing oscillator Circuit

Synthesizer oscillation circuit to introduce here is using the PLL frequency synthesizer (MB87014A). It is possible to make oscillate the stable high frequency signal.
    The PLL is the abbreviation of Phase Locked Loop. In the operation of the PLL, it compares the frequency of the reference frequency oscillator and the frequency of the voltage controlled oscillator by the phase. When there is a difference of the phase, it works as if to control the VCO and to lose the difference. It controls repeatedly(loop) like the oscillation frequency  phase comparison  voltage control  oscillation frequency.

It uses the crystal oscillator with the high stability for the reference frequency oscillator. Because it isn’t possible to make oscillate the high frequency only with the crystal oscillator, the stable high frequency signal can be made by comparing the frequency with the divider changing into the comparatively low frequency.

The frequency which was stable as the characteristic of the PLL synthesizer can be gotten but there is a point which can change the output frequency in changing the dividing percentage of the divider as another characteristic.
The circuit to introduce this time makes the dividing percentage the fixation.

It made the oscillator to introduce this time in the purpose to use as the oscillator of the transceivers for 144 MHz to use by the amateur radio. That the output frequency is 119.3 MHz is due to the following reason.
This PLL oscillator is used as the sub oscillator of the main PLL oscillator.