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8051 / 8052
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Astable Oscillator Circuits
Colpitts Oscillator Circuits
Crystal Oscillator Circuits
Hartley Oscillator Circuits
RF Oscillator Circuits
Sine Wave Oscillator Circuits
Square Wave Oscillator Circuits
Volt Controlled Oscillator Circuits
Wein Bridge Oscillator Circuits
Pierce Oscillator Circuits
Electronic locks 555 monostable circuit diagram
Child lock voltage comparator 555 monostable circuit, a counter, JK flip-flop, UPS power supply design digital logic circuit, electronic door control, and a variety of addition
Keying oscillator circuit
Circuit as shown by the double oscillator is keyed monoflop CC4098, Quad 2-input NAND gate CC4011 and other composition. The circuit is the frequency and duty cycle adjustable
12kHz IF signal generator circuit diagram
Circuit as shown by the l2kHz the intermediate frequency oscillator, an alarm circuit. It uses variable feedback oscillation circuit, the oscillation frequency is mainly determ
Using an inverter transistor monostable circuit diagram
Circuit diagram all three parts of the series resonant crystal and triple CD4049 inverter connection. Supply voltage range is 3-15V. Compact, low-power RF oscillator portable b
Sine wave schematic
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
Multiple waveform generator circuit diagram
Circuit is shown at the same time produce a square wave, triangle wave, sine wave and outputs, especially for electronics enthusiasts and students do with an oscilloscope to ob
1.8kHz signal generator circuit
Circuit shown in Figure select the best working conditions and a reasonable allocation of the temperature coefficient of resonant circuit components. Both ends of the resonance
Monostable circuit diagram of a light control
Combined monostable multivibrator 555 and a pair of light control and light control comparator monostable phase. Depending on the time of the circuit can be used to enable load
Monostable circuit diagram composed of two 555
Common monostable circuit in two ways: manual start type and start pulse type. Single-shot pulse start
Common non-sinusoidal oscillator circuit waveform pulse wave oscillator blocking oscillator transformer
Common non-sinusoidal oscillator circuit, waveform and frequency formula - pulse wave oscillator - blocking oscillator transformer
Non-sinusoidal oscillator circuit waveform pulse wave oscillator single-junction oscillator
Common non-sinusoidal oscillator circuit, waveform and frequency formula - pulse wave oscillator - single-junction transistor blocking oscillator
Common non-sinusoidal oscillator circuit waveform sawtooth oscillator use blocking oscillator
Common non-sinusoidal oscillator circuit, waveform and frequency formula - sawtooth oscillator - use blocking oscillator
Common non-sinusoidal oscillator circuit waveform sawtooth oscillator use multivibrator
Common non-sinusoidal oscillator circuit, waveform and frequency formula - sawtooth oscillator - use multivibrator
Common non-sinusoidal oscillator circuit waveform square wave oscillator self-excited multivibrator
Common non-sinusoidal oscillator circuit, waveform and frequency formula - square wave oscillator - self-excited multivibrator
100 MHz RF oscillator with ATtiny12
A frequency reference for tuning up the RS-232 to 100 MHz RF desktop channel adapter elsewhere on this site, when I found this Saronix crystal oscillator in my junk box. A few minutes with AVRStudio produced an ATtiny12 to make a tone - even fewer parts than using an NE-555. With the addition of a transistor to gate the output, I was set to go....
High Speed Logic Astable Multivibrator (MC74HC04)
The MC74HC04 IC is a low cost CMOS Hex Inverter. I used this type mainly because, it is what I have, although you can use LS type but, with a little modification or exemptions..
Twin Cristal VXO
This is an image Schematic. No Description available.
A Colpitts VCO for Wideband (0.952.15 GHz)
Modern set-top DBS TV tuners require high performance, broadband voltage control oscillator (VCO) designs at a competitive cost.To meet these goals, design engineers are challenged to create high performance, low-cost VCOs.
Crystal Controlled Time Base Oscillator
This is an image Schematic. No Description available.
HCMOS Crystal Oscillators
With the advent of high speed HCMOS circuits, it is possible to build systems with clock rates of greater than 30 MHz. The familiar gate oscillator circuits used at low frequencies work well at higher frequencies and either LC or crystal resonators maybe used depending on the stability required. Above 20 MHz, it becomes expensive to fabricate...
Pierce-gate oscillator crystal load calculation
The crystal used in the topology of Figure 1 can be either a fundamental AT-CUT or BT-CUT. A BT-CUT crystal has poor frequency stability over temperature compared to an AT-CUT. This topology uses a parallel crystal and not a series crystal.
Specifying Quartz Crystals
This article explains the specifications and characteristics of crystals and crystal oscillators, and aids in specifying crystals and working with crystal vendors. The article covers the significant performance characteristics of crystals, which include resonance frequency, resonance mode, load capacitance, series resistance, holder capacitance,...
Hartley oscillator requires no coupled inductors
Examine a traditional Hartley oscillator circuit, and you`ll note its trademark: a tapped inductor that determines the frequency of oscillation and provides oscillation-sustaining feedback. Although you can easily calculate the total inductance required for a given frequency, finding the coupling coefficient, k, poses technical difficulties and...
The I.F. amplifier is similar to the one used in the 80M receiver project . The original design has been modified by putting a couple of LED`s in the source circuit of each Mosfet. The voltage drop across the LED`s keeps the source voltage at about two volts. This results in a much greater AGC range. This arrangement was suggested by N6BIU....
High Voltafe Generator
This is a series regulator with Q900 being the control ele- ment, Q901 a driver, and Q902 an error amp. ZD900 forms the emitter reference voltage source. Since the generated high voltage and other voltages are linked by means of the magnetic field of T900, any change in H.V. will be reflected back to all of the other voltages.
This circuit was used to stop all the BFO drift. The circuit is extremely stable. Turn the receiver off, and then on at any time and temperature, the BFO frequency is exactly the same. The resonator is a Murata CSB 455E. Murata's series number is CSBLA_E 430-509kHz. The data sheet is a .pdf file and the information on this resonator starts on...
RF oscillator uses current-feedback op amp
A current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage followerin practice, a symmetrical emitter follower (Figure 1). The configuration samples the output current, converts it to voltage across a large impedance, and amplifies it to the output using a high-power,...
Convert periodic waveforms to square waves
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 is variable and controllable. Figure 1 shows a circuit that has these attributes and can...
Simple Square wave Generator
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 time. Current consumption is about 600µA.
Square-wave modulator has variable frequency and pulse width
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 of the pulse train. The 100-k potentiometer, R1, along with R2 and C1, sets the...
SQUARE WAVE OSCILLATOR
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 suitable for testing the IF (Intermediate Frequency) strip as the signal will pass through...
Pulse Reading Logic Probe
This circuit uses LEDs to display logic states for high, low, rising pulse, and falling pulse, it is generally useful for debugging logic circuitry.
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
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