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2MHz square-wave generator
With the values shown the circuit generates a 2-MHz symmetrical square wave. Changing capacitors Cl and C2 to 0.01 ÂµÂ¥ results in a frequency of 500 Hz.
Simple triangle-square wave oscillator
By making Rt variable it is possible to alter the operating frequency over a 100 to 1 range
Cmos 555 astable generates square waves
A CMOS timer generates true square waves because, unlike the bipolar 555, its output swings from rail to rail.
This circuit traps a single positive pulse from a square-wave train. Following the rising edge of an input command, the pulse-out signal emits a replica of one positive pulse of the clock signal simultane ous with the clock signal"s next rising edge. The 0 input command signal sets the Ql output of flip-flop "----IClA.
1Khz Square-Wave Generator
When the output is high, R3 and R4 are in parallel, and CI charges via Rl until the current in R2 equals that a
Three phase square-wave output generator
This circuit gives a 3 phase square-wave output for a variable speed motor drive. Operation is straightforward, the 4017 counter is synchronously reset after six clock inputs. The she outputs are combined to give the required waveforms. It is interesting to note that although NOR gates are shown, OR gates will give effectively the same result.
Sine-square wave oscillators
This circuit will provide both a sine and square wave output for frequencies from below 20 Hz to above 20 kHz
Astable Multivibrator Or Free-Running Square-Wave Oscillator Circuit
This free-running square-wave oscillator uses two npn transistors. Output frequency is approximately 300 Hz
Varying the 100 K pot changes the discharge rate of Ct and hence the frequency. A square wave output is generated
Improved non-inverting integrator
In the circuit in Fig. 1, ICla produces the integral term required but also has the side effect of producing a proportional term not required, so this term is subtracted by IClb leaving a pure integral. If the ratio R2/R5 does not exactly match the ratio of R3/R4, the subtraction will not be complete and a small amount of the proportional term will reach the output. The result of this with a...
Triangle-square wave oscillator
This circuit generates simultaneously, a triangle and a square waveform. It is self starting and has no latch up problems. IC1 is an integrator with a slew rate determined by CT and RT and IC2 is a Schmitt trigger. The output of IC1 ramps up and down between the hysteresis levels of the Schmitt, the output of which drives the integrator. By making RT variable, it is possible to alter the...
When this circuit is turned on, the natural offset of the devices serves as an automatic starting voltage. Assume that
The circuit will provide both a sine-and square-wave output for frequencies from below 20 Hz to above 20 kHz. The frequency of oscillation is easily tuned by varying a single resistor. This is a considerable advantage over Wien-Bridge circuits where two elements must be tuned simultaneously to change frequency. Also, the output amplitude is relatively stable when the frequency is changed. An...
Line frequency square-wave generator
With only three components and a buffer, a line frequency square wave having a 1:1 duty cycle may be derived from the power supply. During the alternate half-cycle, however, A is effectively clamped to - 0.7 V by Dl in the bridge which offsets the forward voltage across D2 giving an input to IC1 of approximately 0 V.
Triangle- And Square-Wave Generator Circuit
The circuit will generate precision triangle and square waves. The output amplitude of the square wave is set by the output swing of op amp Al, xndRl/R2 sets the triangle amplitude. The frequency of oscillation in either case is approximately l/0.69ftC. The square wave will maintain 50% duty cycleeven if the amplitude of the oscillation is not symmetrical. The use of a fast op amp in this...
This self-starting fixed frequency oscillator circuit gives excellent frequency stability. Rl and Cl comprise the frequency determining network while R2 provides the regenerative feedback. Diode Dl enhances the stability by compensating for the difference between Voh and Vsuppiy
Square wave generator III
The generator described here is intended for multiburst signal square waveform generation and can be used as a device for characterizing the response of TV monitor amplifiers as shown. The circuit is an RC oscillator with NAND gates (IC4-4011), with its capacitor C changed periodically by means of bilateral switches (IC2, IC3-4016). The control inputs of bilateral switches are driven by the...
Big loop oscillator
L1 is a loop of 10 to 20 turns of insulated wire with a diameter anywhere between 4" to 4'. Oscillator frequency (7 to 30 MHz) shifts substantially when a person comes near or into the loop. This oscillator together with a resonant detector might make a very good anti-personnel alarm.
60Hz Square-Wave Generator Circuit
This generator circuit uses an overdriven amplifier to produce a 60-1 Iz square wave from the 60-Hz ac line.
TTL inverter stages, Ul and U2, are cross-connected with a crystal Yl. A resistor in each stage biases the normally digital gates into a region where they operate as amplifiers
Since the output range swings exactly from rail to rail, frequency and duty cycle are virtually independent
Square wave oscillator
This generator is operable to over 100 kHz. The low frequency limit is determined by Cl
This relaxation oscillator circuit uses diodes to produce charge and discharge paths for CI. The duty cycle is set vi
3 square waves generator
The circuit provides three square wave outputs with 120Â° of phase difference between each other. Reference clock frequency is twice that of the required frequency. This can be obtained from a crystal oscillator with a chain of dividers or by using LM 555 in 50% duty cycle astable mode.
Square-wave generator with 555
A single timing resistor ensures that the output is a square (50% duty cycle) wave at all frequency settings.
Triangle-square wave VCO
The VCO has two buffered outputs; a triangle wave and a square wave. Frequency is dependent on the output voltage swing of the Schmitt trigger, IC2. Superior performance can be obtained by replacing Ql with a switching FET.
The NE555 is connected in the astable mode and uses only three timing components (RA, RB, and Ct. A 0.01-/aF bypass
Variable Duty-Cycle Square-Wave Generator
CI alternately charges via Rl/Dl and the upper half of R5, and discharges via R1/D2 and the lower
Variable Square Wave Generator Circuit
This simple square-wave generator produces a variable frequency output of 2800 Hz to 80 kHz with the values shown.
Adjustable TTL clock
Symmetry of the square-wave output is maintained by connecting the right side of R2 through resistor R3 to the output of the third amplifier stage. This changes the charging current to the capacitors in proportion to the setting of frequency-adjusting potentiometer R2. Thus, a duty cycle of 50% is constant over the entire range of oscillation. The lower frequency limit is set by capacitor C2
4-Decade Square-Wave Generator
This circuit will generate a square wave of 2 Hz to 20 kHz. The circuit uses an op amp in a relaxation-oscil
This circuit uses a positive-feedback loop closed around~a combined comparator and integrator. When power is applied, the output of the comparator will switch to one of two states, to the maximum positive or maximum negative voltage. This applies a peak input signal to the integrator, and the integrator output will ramp either down or up, opposit" of the input signal. When the integrator...