Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
DIY HV Variable Cap
DIY PMA alternator
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
Square Wave Oscillator Circuits
Square Wave Oscillator Circuits
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.
Simple setup tests bit-error rate
Traditionally, the reception quality of a digital receiver is expressed in terms of BER (bit-error rate). This figure is the proportion of received bit errors in a given period. Typically, you measure the BER in the lab by applying an RF signal, modulated by a pseudorandom code, to the receiver under test. This Design Idea suggests an...
Telephone Ring Generator Using Switching Supply
The telephone ring generator shown below generates the needed high voltage from a simple switching mode power supply (SMPS) which employs a CMOS Schmitt Trigger square wave oscillator, 10 mH inductor, high voltage switching transistor (TIP47 or other high voltage, 1 amp transistor) and a driver transistor (2N3053). The inductor should have a low...
Simple circuit controls stepper motors
Stepper motors are useful in many consumer, industrial, and military applications. Some, such as personal-transportation systems, require precise speed control. Stepper-motor controllers can be simple (Figure 1), but they require a variable-frequency square wave for the clock input. The AD9833 low-power DDS (direct-digital-synthesis) IC with an...
RS-232 Powered Temperature Sensor
A state-of-the-art silicon temperature sensor like MAX6577 measures a remote temperature far from the host system. The temperature sensor converts this temperature into a square wave with a frequency proportional to the absolute temperature of its package, while drawing little supply current from the power source. The amplitude of the output...
12 to 120 Volt Inverter
It will supply 15 watts of AC power to a device. It should power lamps, shavers, small stereos and small appliances. If you draw to much power the circuit will shut down all by itself. The output of this circuit is a square wave so there may be some noticeable hum on audio units plugged into it.
An LCD requires an ac electric field to excite the organic compound in the display. Applying a dc voltage could permanently damage the LCD. The circuit in Figure 1 is a simple configuration to test the performance of an LCD. The circuit produces biphase square waves with negligible dc content. The circuit is based on a CD40106 hex...
This circuit was designed to obtain a valve-like distorted sound from an electric guitar or other musical instrument. For this purpose a very high gain, three-FET amplifier circuit, was used. The output square wave shows marked rounded corners, typical of valve-circuits when driven into saturation.
Wave Multiplier for music synthesizers
For the primary multiplier, the "folder", connect the input to the triangle wave output of a VCO. Connect a LFO, envelope generator or even a DC voltage to the folds input. The result will be a harmonically rich signal at the "F out" output. A second input based on a lag circuit allows square waves and other hard-edged waveforms to be used as...
Voltage programmable square wave generator
Here's another daft yet interesting PIC12F675 idea I came up with. When I wanted to show someone how logic gates worked I could only find a NAND gate which wasn't very handy for demonstrating AND's OR's, NOR's and ExOR's. I also wanted to have a play with the A/D converter on the 12F675 so I came up with the idea of a PIC that could function as...
Function Generator, capacitance and inductance meter
This site contains complete schematics and code for a 68HC11 based frequency counter, square wave synthesizer, sine wave synthesizer, programmable filter, capacitance and inductance meter, with a digitalker speech synthesizer output. Project specifications are given below.
Square wave oscillator
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 with a other generator, sine wave frequencies or square pulses, continuous or interrupted...
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 desired and count reached all the inputs of IC4 become high, so the output goes low. This...
Function Oscillator using 8083
Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in four switched ranges. There are both high and low level outputs which may be adjusted with the level control. This project makes a useful addition to any hobbyists workbench as well. The waveform generation is produced by...
Square Wave Generator Using CMOS 74C14 Single Integrated Circuit Chip
Many ways to create a square wave output, but by far the simplest is to use a CMOS Hex Schmitt trigger inverter. These are fast, and with the outputs in parallel, will provide enough drive to ensure that the rise and fall times are very short indeed. This is one design circuit for the square wave generator. This is the figure. This circuit is base
Simple Adjustable Sine/Square Wave Oscillator Circuit schematic with explanation
This circuit provides sine and square wave at frequency of below 20Hz up to above 20KHz. The benefit of this circuit diagram is that you can adjust the output frequency by varry the variable resistor of R6.
Sawtooth and Squarewave Oscillator
With the Control "On the PCB", set at these Positions* CX = CW Center CCW 100 pf = 6, 400 hz 12, 050 hz 26, 000 hz 470 pf = 1, 525 hz 3, 200 hz 7, 232 hz. 001 uf = 681 hz 1, 425 hz 3, 250 hz. 0022 uf = 348 hz 619 hz 1, 540 hz. 01 uf = 69 hz 146 hz 340 hz. 047 uf = 16 hz 34 hz 88 hz. 1 uf = 7 hz 14 hz 34 hz These were Measured Freq
Square wave generator with CD4070
Square wave generator with CD4070. with this circuit it can generate square wave up to 2 MHz In this example I use CD4070 CMOS. VDD :.
sine to square triangle wave
If you need a triangle wave signal or a square one but you only have a sinewave generator, use this converter to avoid the trouble of beginning from scratch. It is made up of two ICs: one LM13700 and one TL084. The amplitude of the squarewave can be varied through P1 while potentiometer P2 varies the amplitude of the trianglewave signal. The conve
cd4047 based squarewave inverter oscillator
This simple and cheap(but powerful) squarewave oscillator can give oscillation to any mosfet based inverter/ups. The circuit consists of one central I. C CD4047. I used HCF4047BE from ST microelectronics. This is an improved version of circuit spread over the internet of inverter by I. C 4047. This circuit has more efficiency than that one. Here...
convert square wave inverters to sine wave inverter
There`s pretty easy to make squarewave inverters` circuits in the internet. But to run most load like fan, TV, etc you need to have a sinewave inverter. Making sinewave or near-sinewave inverter is more complex and costly. But we can also convert squarewave inverters to sinewave inverters. A LRC resonant circuit is needed for this. The values dete
Two-phase squarewave oscillator
It`s one of the simplest circuits to get working but one of the more tricky to understand. This simple two-transistor oscillator has a technical name of astable multivibrator and provides a squarewave (of sorts) output in and out of phase. First up, keep in your mind that capacitors cannot change their voltage instantly. So we`ll assume that th
How to Make a Simple 200 VA Homemade Power Inverter Circuit Square Wave Concept
An efficiency of around 85 % and a power output of more than 200 watts is what you will get from the present design of a power inverter (home built). Complete circuit schematic and building procedure explained herein. You might have come across many articles regarding power inverters, however you might be still confused about making a power inverte
Simple Square Wave Generator Circuits
Using a field effect transistor at the input of a schmitt trigger, means a low value capacitor can be employed. The trigger by Q1 and O2 has a hysteresis of approximately 3V. This is controlled by the 3V zenen Mth C1 uncharged O1 is off and O2 is forward biased. The voltage at the source of Q1 is approximately +4V. O2 conducts, thus turning on TR
Simple Square wave Generator using transistors ~ Easy Electronics
An useful feature of this circuit is that the frequency can be changed by changing a capacitor value, a switch can be add to choose between various frequencies.
op amp square wave generator
This is a square wave generator circuit. The main component of this circuit is the 741, a general-purpose operational amplifier. This circuit employs a single power supply Vs that can range from +5V to +15V. The square wave output of this circuit is easy to adjust. `Timing` is defined by C1, R4, R5, R6, and R7 while duration is defined by R1, R2,
Standalone Circuit Converts Square Waves To Sine Waves
Many microcontrollers or PICs will have uncommitted digital-to-analog converter (DAC) outputs that can be used to generate sine waves. But these are generally low resolution (8 to 10 bits), yielding a total harmonic distortion (THD) in the 1% range. Or, using a fifth- or seventh-order switched-capacitor filter with a square-wave output ties up two
Triangle/Square-Wave Oscillator Serves Dual Purpose
In conventional triangular-wave oscillators, hysteresis from positive feedback in the Schmitt trigger determines the voltage levels and amplitude of the triangular waves. With this topology, it`s difficult to independently vary the voltage levels and amplitude of the output waveforms. To combat this limitation, a more versatile oscillator was...
555 Timer IC for Square Wave Generator Application
You can start to set your Square Wave Generator up using 555 timer IC through the circuit shown above. Find it match with the pinout of 555 timer IC. The osciloscope is then connected to the output of 555 timer IC in order to view the square wave. From the oscilloscope you can measure the wave frequency and verify it by varying the resistance in
op amp Getting PWM with an astable multivibrator (square wave generator)
To create a square-wave generator but I would like to modify it by getting an output that runs from 0 to +5V, as well as changing the signal so that I can change the duty cycle of the pulse(PWM).
Astable Oscillator Circuits
Colpitts Oscillator Circuits
Crystal Oscillator Circuits
Hartley Oscillator Circuits
RF Oscillator Circuits
Sine Wave Oscillator Circuits
Volt Controlled Oscillator Circuits
Wein Bridge Oscillator Circuits
Pierce Oscillator Circuits
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...
DIY HV Variable Capacitor
DIY PMA Alternator Plans
Digital Signal Integrity