Square wave

Triangle / Squarewave Oscillator

Here is a simple triangle/squarewave generator using a common 1458 dual op-amp that can be used from very low frequencies to about 10 Khz. The time interval for one half cycle is about R*C and the outputs will supply about 10 milliamps of current. ..

Variable Square wave oscilator with 555

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 capacitor with a higher value. The formula to calculate the frequency is given by: 1/f = 0.69 * C * ( R1 + 2*R2). The duty cycle is given by: % duty cycle = 100*(R1+R2)/(R1+ 2*R2). ..

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 IC1. This versatile IC even has a sweep input, but is not used in this circuit. The IC contains an internal squarewave oscillator, the frequency of which is controlled by timing capacitors C1 - C4 and the 10k potentiometer. The tolerance of the capacitors should be 10% or better for stability. ..

Frequency Divider

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 triggers the monostable consisting of IC5B and IC5C, which provides a sort output pulse. The output of IC5A goes high, resetting the three counters and the count then begins again. To program the counter it is first necessary to work out the binary coded decimal (BCD) equivalent of the required division ratio. ..

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 square pulses. Main characteristic the generator it is, that the circle of operation can be regulated so as to he is constituted from until ten interrupted pulse. This pulses are particularly useful for the adjust amplifiers, loudspeaker, rooms of hearings etc. ..

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 Generator with CMOS 74C14

This circuit is based on CMOS IC 74C14. The output of this circuit is from 0V to +12V, and is fed to the 10k level pot by a 10k resistor. This reduces the level to 6V P-P, which is equal to 3V RMS. The input circuit is designed to ensure that the Schmitt input is supplied from a 1/2 supply voltage (6V), so the applied AC will swing evenly about this point and produce a symmetrical square wave...

Adjustable Sine Square Wave Oscillator

This is a adjustable sine square wave oscillator circuit...

The circuit has both square-wave and triangle-wave output. The left section is similar in function to a comparator circuit that uses positive feedback for hysteresis. The inverting input is biased at one-half the Vcc voltage by resistor R4 and R5. The output is fed back to the non-inverting input of the first stage to control the frequency. ..

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 a single 2-input logic element. The logic function is determined by an analogue voltage applied to the GPIO4 pin when the device is first reset, it isn't sampled again after this so logic can't be changed on the fly. The 3 MSBs of the A/D conversion give eight distinct voltage levels that map to specific logic functions...

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 resistors...

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 the IF transformers without any attenuation, no matter what the tuned frequency of the circuit...

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 the signal source. There is also a "squared" output available, with "pwm" inputs to further vary the posibilities. To use the second multiplier, the "grinder", feed the input from the output of a VCO. Adjusting the "drive" and "lag" pots will give variation to the output signal...

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...

The circuit in Figure 1 produces timing signals with a sound like that of a mechanical metronome. IC1 is a 555 timer that oscillates at approximately 3200 Hz. The two 3-kW resistors and the 0.047-µF capacitor set the frequency. IC2 divides the frequency of IC1`s output by 2. IC2 produces a square wave with an exact 50% duty cycle. The frequency of the output of IC2 determines the sound of each beat. A higher frequency yields a sharper sound, like beating on a small drum; a lower frequency produces a deeper sound, like beating on a large drum...