Electronic Circuits and Tutorials
Electronics Schematics - S

Signal Generators Circuits

10 octave Audio Generator Speeds Tests: 07/07/94 EDN-Design Ideas

1KHz Sine Wave Generator: Simple circuitry, Low distortion, battery operated Variable, Low impedance output up to1V RMS.

3 to 12 MHz Signal Generator:

555 Tone Generator 8 Ohm Speaker: 

68HC11 Function Generator:

Bus Request Signal Generates Logic Waveforms: 06/20/96 EDN-Design Ideas

Chaos Generator:

Convert periodic waveforms to square waves: 08/16/2001 EDN - Design Ideas / 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 drive several TTL-compatible loads.

DCC Waveforms and Voltages For DCC Systems:

DDS and converter form signal generator: 02/20/03  EDN-Design Ideas / Many applications require low-frequency signal generators that can deliver high-performance, high-resolution signals. This Design Idea presents a circuit that generates frequencies of 0 to 1 MHz. Sinusoidal, triangular, and square-wave outputs are available.

DDS device produces sawtooth waveform: 07/10/03  EDN-Design Ideas / Ramp or sawtooth waveforms are useful for a broad range of applications, including automatic-test equipment, bench test equipment, and actuator control. Discrete components typically set the waveform frequency. Unfortunately, drift in these component values over time and temperature limits the accuracy of the output frequency.

DDS using AD9835:

Digital Signal Processor (DSP) for Radio Communications:

FIFO Makes Cheap Waveform Generator: 12/21/95 EDN-Design Ideas

Frequency Generator, 555IC: Fair Warning: this site has pop-up ads

Function Generator:

Function Generator #2:

Generate CID / CIDCW Analog Signals: 10/22/98 EDN-Design Ideas

Generator Features Programmable Duty Cycle: 11/23/94 EDN-Design Ideas

HF Signal Generator: 

Improved PL Tone Decoder:

linkwitz Cosine Burst Generator: part of speaker measurement set described in the construction article

Low Cost Function Generator:

Low Distortion, Amplitude Stable Sine Wave Oscillator:

Low Frequency Sine Wave Generator:  The two circuits below illustrate generating low frequency sine waves by shifting the phase of the signal through an RC network so that oscillation occurs where the total phase shift is360 degrees.

Make a simple ramp generator for stepper motors: 04/04/2002  EDN - Design Ideas / Stepper motors are synchronous motors that step at the pulse rate of the driving signal. For the motor to move quickly, the stepping rate must be fast. However, because of motor and load inertia, the motor often cannot go from 0 rpm to the desired number of revolutions per minute in one step.

Microphone Circuit Test Oscillator: 440 Hz Tone generator for testing XLR microph1-lines

MonoStable Flip Flops (One Shot): 

Musical Tone Generator:  Fair Warning: this site has pop-up ads

Occasional Pulse Circuit: 

PIC Controlled DDS VFO, 0 to 6 MHz:

Precision Waveform Converter uses Sawtooth Wave: 03/01/96 EDN-Design Ideas

Programmable Ramp Generator has 14 Bit Linearity: 09/12/96 EDN-Design Ideas

Pulse Stretcher Increases ECL Gate Gains: 01/20/94 EDN-Design Ideas / stretches the output pulses of an ECL comparator by operating the ECL line receivers with unusually large pulldown resistors to the -15V supply. The large load resistance maximizes the gains of the emitter-follower output stages and speeds up the rising edges. At the same Time, the low pulldown current, together with the input and wiring capacitances, slows the falling edges. These actions stretch the positive pulses by approximately2 nsec/stage.

RF oscillator uses current feedback op amp: 10/03/2002  EDN - Design Ideas / A current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage follower—in 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, low-output-impedance amplifier..

Sawtooth Generator Spans a 70 DB Range: 07/07/94 EDN-Design Ideas

Scheme yields Frequency Locked Triangle Waves: 02/02/98 EDN-Design Ideas

Self Oscillating Amplifier for Distortion Testing: allows the home constructor to make quite accurate measurements, without having to spend a lot of money on a low distortion oscillator

Ceramic Filter Beat Frequency Oscillator:

Signal Generator for Signal Tracer:

Signal Processor Adds LED Display: 06/05/96 EDN-Design Ideas

Simple Technique Generates Precise HART Waveforms: 07/22/02 Electronic Design - Ideas for Design / Designed to complement conventional 4- to 20-mA analog signaling, the Highway Addressable Remote Transducer (HART) protocol supports two-way digital communications for process measurement and control devices.

Sine Wave Generator With Crystal Accuracy:

Smooth Tone Click less CW Side Tone Generator: This circuit is about as good as it gets for generating Morse code tones. It may be used as a code practice oscillator, a Tone generator for a keyer, or a SideTone oscillator for a transmitter.

Square wave modulator has variable frequency and pulse width: 08/08/2002  EDN - Design Ideas /  A few years ago, I worked at a disk-drive company. We had a plating facility that required square waves to drive the high-voltage plating operation. The challenge was that the square wave's pulse width had to be variable, along with the duty cycle. Also, the amplitude of the pulses had to be adjustable..

Square Wave Oscillator:

Square Wave to Sine Circuit:

Summer Linearizes Ramp & Triangle Generators: 12/08/94 EDN-Design Ideas

SwOpAmp Makes Square Wave Generator: 02/15/96 EDN-Design Ideas

Test Pattern Generator:

Testcard Generator:

Timers Generate Variable Sweep Frequencies: 08/01/96 EDN-Design Ideas

Tiny Programmable Oscillator Operates From 5 kHz To 20 MHz: 08/06/01 Electronic Design - Ideas for Design / By merging a digital potentiometer with an oscillator chip, a very small programmable oscillator (1 µMAX and one SOT-23 package) can be realized. In addition to consuming very little board space, the circuit requires only three signals from a. . .

Transconductance amp gives oscillator reciprocal response: 04/17/03  EDN-Design Ideas / The circuit in Figure 1 is a variation on the familiar integrator/comparator triangle-wave oscillator, which you typically implement with two op amps. An integrator and a comparator connect in a positive-feedback loop; the comparator drives the integrator and vice versa. A fixed amount of hysteresis exists in the comparator, producing a triangle wave at the integrator's output...

Tri Waveform Generator: 

Triangle & Square Wave Generator:

Triangle / Square wave Generator:

Triangle Waveform Generator:

Triangle/square-wave oscillator serves dual purpose: 11/22/99 Electronic Design - Ideas for Design / 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. . .

Video Generators: many test picture generation circuits

WiFi Can Antenna:

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