Top Circuits Page 53
- Page 53
-
Circuit diagram used CA3140 op amp and diode array, produces a low distortion sine wave. Table shows the values of R and C, access to frequencies from 50Hz to 30kHz. Zener diod..
-
-
Converting periodic waveforms to square waves is an integral part of extracting a clock signal from data, creating waveform generators, and making timing-pulse generators. Any square-wave-conversion circuit is more valuable when the square wave`s duty cycle....
-
To "round" your square wave, you need to integrate it twice; once to produce a triangular wave, and a second time to produce a parabolic waveform. (A parabolic wave looks pretty much sinusoidal.) You can do this passively using a simple network such as the....
-
This simple circuit generates a good and stable 1V peak-to-peak square wave at 100Hz, 1KHz and 10KHz using a single 1.5V cell as power supply. An useful feature of this circuit is that frequency changes can be obtained by switching only one capacitor at a....
-
The circuit in Figure 1 satisfies all these criteria. The circuit delivers a unipolar (adjustable from 0 to 12V) pulse with adjustable frequency and pulse width. The first half of a dual, retriggerable monostable multivibrator, IC1A, generates the frequency....
-
This project is a piece of test equipment. It`s a square wave oscillator with 6 selectable frequencies from 1Hz to 100kHz, incrementing in decade values. It`s most useful application is as a Signal Injector for radios and TV`s. A square wave is the most....
-
-
This circuit uses LEDs to display logic states for high, low, rising pulse, and falling pulse, it is generally useful for debugging logic circuitry...
-
1kHz square wave signal source circuit Illustrated is a use CD4060 composed of standard square wave signal source circuit. CD4060 ? foot, foot crystal rr external and compensat..
-
1kHz square wave signal generator As shown by the time base circuit NE555 plus the time constant circuit (47 kfl O.Q15 UF) composed of] hair kHz square wave signal generator. ..
-
Using two gates from a CMOS 4011 NAND chip, a simple aquarewave oscillator can br made. Alternatively a CMOS 4001 chip can also be used, or a TTL equivalent. In this circuit the mark space ratio can also be independantly controlled by varying the value of....
-
The generators of square pulses, are used in a lot of applications, between which the adjustment of conditions of entry in the digital circuits and the control of amplifiers acoustic frequencies. This circuit is a generator that it produces, in combination....
-
-
This circuit will divide the frequency of a TTL compatible square wave signal by a factor from 0 to 999. The circuit comprises three decade counters IC1 to IC3 and a few NAND gates. The three 7490?s are cascaded and count is the input signal. When the....
-
This is a very simple circuit utilising a 555 timer IC to generate square wave of frequency that can be adjusted by a potentiometer. With values given the frequency can be adjusted from a few Hz to several Khz. To get very low frequencies replace the 0.01uF....
-
How it works: the circuit as shown in FIG. VT1, VT2 and resistor R1 constitute a constant current source for charging the capacitor C2 for linear; VT3, VT4 and resistor R2 constitute a constant current source for ..
-
Common non-sinusoidal oscillator circuit, waveform and frequency formula - square wave oscillator - self-excited multivibrator ..
-
The VFC (voltage-to-frequency-converter) circuit in Figure 1 achieves a wider dynamic range and a higher full-scale output frequency100 MHz with 10% overrange to 110 MHzby a factor of 10 over any commercially available converter...
-
Unijunction transistors are very intresting. They love to be used in oscillators, and it doesn't takes too many part or very much coaxing to get their sawtooth outputs. This litle squealer will tell you how much voltage it'a connected to. The higher the....
-
Who would like to build a sidetone oscillator with a minimum amount of parts should try the NE567 integrated circuit. The NE567 is a PLL circuit with an internal VCO for a operating frequency less than 500 kHz and it is normally used as an audio tone....
-
Incandescent lamp has been used to reduce harmonic distortion in sine oscillator circuit. The nonlinear resistance characteristic of the lamp filament help the circuit to shape the signal to approximate the ideal sine wave. Here is the classic Wien-bridge....
-
It may be easy to find a precision voltage reference for your application; however, a programmable precision reference is another matter. The circuit in Figure 1 yields a precision reference with an LSB of 62.5 µV. The circuit is a 16-bit DAC using three....
-
A battery-powered, pushbutton-triggered TTL/CMOS-compatible source of debounced 5V logic pulses is a simple but handy piece of test equipment to have in any tool kit (Figure 1). The circuit`s battery-powered operation complicates what would otherwise be a....
-
Almost any 2x16 character LCD module with Hitachi HD44780 controller chip will work. The LCD pin numbers on the schematic are not valid for all LCD modules. Please check the actual signal names on your particular LCD module. The selected DFCW frequency....
-
This is an image Schematic. No Description available...
-
This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This simple circuit would be a great touch to any home audio project. Using a dual polariity....
-
I built this cable for my Casio QV-200 digital camera, it should work for many Casio models. It`s basically a inverting buffer/converter to/from RS-232 voltage levels from/to CMOS levels. Why Casio didn`t put this inside the camera like everyone else does is....
-
Both ac and dc motors in modern industrial systems often receive their control from PLCs (programmable-logic controllers) in a control room safely away from the process. If an operator must manually set the motor speed while observing the process, the....
-
Current-limit switches are virtually ubiquitous in system controls. They provide a safe means for regulating the current delivered to a load circuit. The switches allow the load current to increase to a programmed limit but no higher. Typically, the current....
-
One of the requirements that is easily overlooked is the need to identify your station during your video communications. From what I have seen, some R/C wireless video users are neglecting to broadcast their ham radio call sign. Essentially, USA hams must do....
-
Digitally programmable current sources that feature automatic trimming and retain the setting despite power-down cycles are useful in applications such as RF- and laser-communications drivers. The circuit in Figure 1, for example, is particularly suited for....
-
Crosstalk from digital data signals into the clock signal of a data-conversion system can cause hard-to-diagnose problems. This obscure problem is different than the crosstalk from digital data signals into the analog signal path, which was the subject of....
-
The digital delay presented here is expected to be sufficient for most applications, and although the delay is fixed at 20ms, this is the most usable delay period. This is the equivalent of being about 7 metres away from the rear speakers, and they will have....
-
The circuit is a simple, but accurate Digital Guitar Tuner. It samples the input, which can be directly from the mics of an electric guitar, or from a microphone, it you`re using an acoustic guitar. It can ofcourse also be used for tuning other instruments.....
-
Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is always on to separate Km. from hm. The rightmost display D1....
-
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is....
-
What is the effect of digital signal bits cross-talking into the analog section of a data-conversion system? There is a lot written into the data sheets of ADCs and DACs on how to minimize it. But, when asked what is the result, most laymen have the insight....
-
This design was never completely finished, so consider it to be in the very early experimental stage. I don`t sell kits, programmed PLD`s, or provide support for this project, and I will never be published. But if you want to take a bash at making it....
-
Many designs require FIFO elastic buffers to form a bridge between subsystems with different clock rates and access requirements. However, in some applications, you need FIFO buffers for data conversion. One example is the case in which you need to connect....
-
I have had this project hanging around for ages and have tried to submit it for publication without much enthusiasm so I will make everything available here for the individual constructor. The complete Pascal source code for the compiler program is available....
-
You may find that there are too few, if your power is very noisy (as can happen in a car environment) it may help to place a 0.1uF and/or 10uF capacitor before and/or after the voltage regulator. At the moment I`m not using these but at this point I`ve only....
-
A typical device that requires less than 5v and draws less than 25mA is an LED. A LED must be supplied with an exact voltage for it to operate correctly. Because it requires LESS than 5v, a dropper resistor (current limiting resistor) must be included in....
-
This page features a replacement circuit for the LM3909 LED Flasher / Oscillator using discrete components. The circuit is functionally the same as the integrated LM3909 but has a minor variation of the components used. Naturally the circuit will not be as....
-
The circuit in Figure 1 provides not only a complementary drive signal but also a deadtime delay on both rising and falling edges. The high-speed inverter gates use IC1, a 74HC04 CMOS circuit, and 1N5819 Schottky diodes D1 and D2. The 74HC04 inverter....
-
This logic probe uses a single CMOS IC and shows three logic conditions, High, Low and Pulsing. In addition if the probe input is neither hi or low (the high impedance state of tri-output logic ic`s) then no LED`s will light. Power from the logic probe is....
-
The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be very precise and tolerant of voltage transients. These IC`s are easily damaged by short voltage spikes. A fuse will blow when its current rating is exceeded, but....
-
This project is designed to program the 8-pin PIC12c508A and 18pin PIC16F84 microcontroller chips to support the projects we have designed, however it will also program a number of other 8-pin & 18-pin microcontrollers and the full list can be seen when....
-
Many embedded-microcontroller applications require generation of analog signals. An integrated or stand-alone DAC fills the role. However, you can often use PWM signals for generating the required analog signals. You can use PWM signals to create both dc and....
-
A digital storage oscilloscope (DSO) is a very important
piece of test equipment that can do the jobs that a normal CRO
just can`t handle. Such as capturing single shot and widely
spaced waveshapes, and looking at non repetitive....
-
The logic designer is filled with features. It would not be possible to list all the possible combinations of the unit as the various building blocks on the board can be interconnected to obtain a wide variety of counting and testing stages. You will be able....
-
This LOGIC PULSER capable of delivering pulses of various compositions, to any type of circuit you wish to test.
Basically it is designed to complement the LOGIC PROBE and can be used in situations where the LOGIC PROBE is not so effective.
It is an....
-
This circuit is a Logic Probe. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of the circuit that we want to analyse: same Vcc and same GND. To check the logic level, we must....
-
This project is based on a probe logic states, capable of measuring levels from TTL (5v) to state levels of PLC's (24v). For this we have employed the use of the PIC 12F683 microcontroller, which by its nature is capable of operating at low voltages, in this....
-
When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With this probe the logic states are audible. This probe is designed for TTL circuits only but could be modified for CMOS. The....
-
Despite exhaustive searching, every reasonably priced solenoid valve for controlling propane during pushbutton start required 12VDC, beyond the capabilities of a normal pump battery. I know that there are methods to generate HV pulses which will actuate the....
-
You're simulating a circuit, it requires several digital gates, but you don't have a mixed-mode simulator. What to do? One solution involves creating simplified versions of the logic functions. To do this, we look to the NMOS transistor implementation of....
-
This circuit diagram for a logic tutor kit was made from MS Word graphics...
-
As illustrated, 555 and R4, R5, C1 and so connected as a controllable multivibrator mode, which force reset terminal 4 feet to explore pen, control terminal 5-pin external level high and low logic level input related...
-
Logic pen also known as logic detection probe, it is a common tool in the digital circuit detection logic state of each point. Digital circuit logic state is generally divided into three types: namely, a high level "l", the low level "0"..
-
As shown in Figure is a large high-brightness LED driver circuit for a sufficient drive current, integrated circuits using a 7447A or 74247. Digital display tube has eight ligh..
-
As shown, in FIG a decimal seven storage - Decoding - drive unit 74 143, this unit has a constant output for all segments. Each at a voltage of 5V when the current is about 15 ..
-
This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. The tuning voltage is supplieb via RV2, a 10k potentiometer connected to the 12 Volt power....
-
This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now replaced by the MK484. The design is simple and sensitivity and selectivity of the receiver are good. All general....
-
This circuit shows an active antenna that can be used for AM, FM, and shortwave (SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. This circuit is designed to be used on receivers that use untuned wire antennas,....
-
A wide variety of low power wireless communication systems have surfaced in recent years. Automotive keyless entry, home security, bar code readers, and child monitors are just a few of the many applications for this technology. Most low power wireless....
-
This is a description of an experimental AM receiver for VLF. It is crystal controlled to receive 181.818 kHz (more or less) and operates as either a single conversion superhetrodyne or a direct conversion receiver. The bandwidths are expected to be 15 Hz to....
-
The basic MK484 (Replacement for the ZN414) connected in its minimum configuration as a radio receiver for the A.M. Broadcast band and the upper half of the United States' FCC Part 15 Lowfer (1600-1750 meter) band. Its a circuit straight out of the....
-
A MW AM radio like those you buy, or used to buy. Use just BC549 trannies, with the BC559 complement being allowed in the audio output stage. Buying RF antenna coils, oscillator coils and intermediate frequency transformers would be cheating - wind your own.....
-
This circuit can be used to recieve AM stations in an FM radio. Is a regenerative circuit that samples AM signals of all frequency and retransmits them in the FM band or in TV band...
-
Typical QRP receivers include Direct Conversion (DC) and simple Superheterodyne types. These receivers often have quite a wide AF bandwidth which can make inteligiblity somewhar restricted, especially under difficult QRM conditions. Many commercial amateur....
-
The circuit for a powerful AM transmitter using ceramic resonator/filter of 3.587 MHz is presented here. Resonators/filters of other frequencies such as 5.5 MHz, 7 MHz and 10.7 MHz may also be used. Use of different frequency filters/resonators will involve....
-
The regenerative detector uses a field effect transistor (FET). Like with the better valve designs, feedback is controlled by a variable capacitor. A ferrite rod was used to allow reception of local stations without an external antenna. This FET stage forms....
-
AM base for small-signal amplitude modulation, the circuit as shown C is a high frequency bypass capacitor. ..
-
AM diode ring circuit consists of four diodes to form a ring road, so called diode ring modulator circuit. AM diode ring circuits greater advantages. Due to the characteristics of the diode and discrete circuits, etc., often have to use resistive element....
-
AM MC1496 analog multiplier integrated circuit configuration shown in Figure 21-39. Channel two-input, ? pin DC bits are 6V, can be used as a carrier channel two input channels..
-
AM radio shows monolithic circuit. The broadcast signal received by the antenna foot iciCD fed by a high efficiency mixer, the output from IF, IF transformer after filtering, a..
-
AM radio shows of the IF amplifier and detector circuit. Mixer from the mixer IF output signal level of the intermediate frequency transformer after the device Ti, is applied t..
-
CXA1019 Japan SONY companys high-performance, high sensitivity FM AM radio special manifold. CXA1019 high integration, includes FM/AM tuner circuit, a mixer circuit, a mute cir..
-
4096 times the input frequency PWM clock signal, counts up (Q three ), until the base is full ICi-IC3 (sweet day), the output point d a MAX clock signal, which on the one hand ..
-
33. DA converter circuit ; Shows the basic structure of the multi-channel D/A converter circuit, it can be more consistent with the encoded signal is converted into a digital s..
-
High-speed DACs, such as Analog Devices` AD9776/78/79 TxDAC family, offer differential outputs, but, for low-end ac applications or high-precision level-setting applications, a single-ended current-output DAC with a differential-conversion circuit provides a....
-
The DS1602 and DS1603 from Dallas Semiconductor offer a simplified hardware solution for keeping time as well as tracking powered up time of a system. The DS1602 and DS1603 can be read and written directly by a microprocessor or microcontroller using simple....
-
This design idea describes a simple circuit to generate a programmable negative control voltage. It takes the output of a single supply digital-to-analog converter (DAC) and produces a variable negative voltage. The DAC output from 0V to +2.5V is converted....
-
The transmitter output drivers present a low impedance to inbound surges and must be able to drive sufficient current in the primary of the transmit transformer in order to produce the required output pulse at the network interface. The receiver inputs....
-
Early DACs contained standard R-2R ladder networks, and produced a negative output voltage. These early DACs, such as the MAX7837/7847 and the MAX523, require both positive and negative supply rails to accommodate their negative output. With the transition....
-
Precision DACs are essential in many consumer, industrial, and military applications, but high-resolution DACs can be costly. Frequency-to-voltage converters have good nonlinearity specificationstypically, 0.002% for the AD650and are inherently monotonic.....
-
In an R-2R DAC design with supply voltages exceeding ±5V, large voltage glitches (up to 1.5V) can occur during the DAC`s major-carry transitions. These glitches can propagate through the output buffer amplifier and appear at output. The slewing of the level....
-
Despite the popularity of digital devices, real world signals are typically represented by analog signals. Digital control systems process real world analog signals by using an analog-to-digital converter (ADC) to convert analog signals to digital.....
-
You can effectively double the sample rate of a DAC by interleaving two DACs into a single unit. Updating each DAC on an alternating basis and switching to the appropriate output double the effective throughput of the overall system. It is essential to....
-
The availability of a seemingly limitless variety of monolithic DAC chips makes it easy to implement most digital-to-analog-conversion applications with a single off-the-shelf device. Sometimes, an unusual set of requirements necessitates a multichip....
-
The dual, voltage-output DACs shown in the figure below employ a combination of power-conserving tricks to draw less than 20µA from a 5V supply. The circuit suits a need for programmable voltage generation in slow or static applications, such as the nulling....
-
This article discusses application circuits for Maxim force/sense digital-to-analog converters (DACs). Applications include: selectable fixed-gain DAC, programmable gain DAC, photodiode bias control, amperometric sensor control, digitally programmable....
-
A laser module designer can use a fixed resistor, mechanical pot, digital pot, or a digital-to-analog converter (DAC) to control the laser driver`s modulation and bias currents. The advantages of a programmable method (POT or DAC) are that the manufacturing....
-
The simple and inexpensive circuit in Figure 1 generates two PC-controlled analog reference voltages. You supply a wall-adapter supply and a parallel connector, and the circuit is ready to run. The circuit uses two 12-bit AD7243 DACs, which require only one....
-
S/PDIF is an acronym for Sony /Philips Digital Interface (or Sony /Philips Digital Interconnect Format). The full specification for the S/PDIF interface consists of hardware and software, but only the hardware side will be discussed here - the software is....
-
LVDTs (linear variable differential transformers) are electromechanical measuring devices that convert the position of a magnetic core into electrical signals. You generate these signals via excitation on the primary side. The results on the secondary....
-
D/A conversion circuit by the DAC0832 and op amplifier LM358, etc., there are two bad-out channel, unipolar voltage output. Digital output range: OO-H FFH, corresponding to an ..
-
ICi latch is used to lock the digital data clock signal rises ~ Qu holding data port AD7s23 thin film resistor ladder and c- Jing switch 08 constitute 8-bit DAC, the reference voltage ..
-
MP4 audio circuitry is shown, it is by the audio D/A converters and audio amplifier combination circuit, which has a body product circuit simple, suitable for use in small MP4 digital machines...
-
8 microcomputer data is 8-bit parallel output, in addition to the serial input of D -A converters, in general, have to enter the data into two groups, and to Chen whole. Requir..
-
8 shows a typical D/A conversion circuit, which uses DAC0830/DAC0832 chip, the microprocessor will output 8 -bit digital signal into an analog signal. ..
-
A/D converter circuit can be represented by a simplified circuit shown in Figure 4 is a (bit) parallel type A/D converter circuit, the so-called median is the number of bits in..