Sawtooth Generator Spans a 70 DB Range:  07/07/94 EDN-Design Ideas  /  (Electronic Circuit diagram added 03/03) The circuit in Fig 1 demonstrates a simple method for generating a voltage-programmable sawtooth waveform having a dynamic range greater than 70 dB. In addition to the sawtooth waveform, the circuit also produces corresponding triangle- and square-wave outputs. The three ICs and associated components cost a total of about $13. IC1's astable-multivibrator-type V/F converter produces a square wave whose frequency is accurately proportional to the converter's analog input and produces a differential 1.8 V p-p triangle wave of equal frequency across its timing capacitor CT. IC2's video-difference amplifier level shifts and amplifies this square wave to produce a 20 V p-p triangle wave. A high-pass filter differentiates this signal to generate an in-phase square wave. The triangle wave and differentiated signal drive the analog input and reference-comparator inputs of IC3's gain-of-one balanced modulator....  

Scheme yields Frequency Locked Triangle Waves:  02/02/98 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)  

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 (Electronic circuit added 5/02)

series regulator with Q900 :  This is a series regulator with Q900 being the control element, 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. (Electronic circuit design added 02/05)

Servicing and Repairing Pagers Using the Agilent 8648A Option 1EP:  Agilent Application Note   (Circuit / schematic design added 6/06)

Signal Frequency Beat Frequency Oscillator:  (added 2/05)

Signal Generator :  This is a lovely project for home constructors keen on building their own test and measurement (T&M) equipment. It makes use of the ICL8038 signal generator chip, manufactured by Intersil. An improved version, made by Exar corp. is available (XR8038A). It can be used to produce three types of waveforms, sine, square and triangle. The frequency, amplitude and duty cycle can be varied, and selection of waveform is done digitally. To further reduce the complexity, a 3-to-1 switch may be used in place of the digital selection circuitry. I made use of the digital selection mechanism because switches available on the market are prone to dirt accumulation and poor contact quality. Besides, the digital method is a lot cooler! (added 2/06)

Signal Processor Adds LED Display:  06/06/96 EDN Design Ideas  / (added 5/05)  Designers using the Texas Instruments TSS400, a versatile 4-bit sensor-signal processor, may find the circuit in Figure 1 useful as a replacement for, or an adjunct to, the IC's built-in display capabilities.

Simple Circuit Generates Clean Sine Waves:  06/19/97 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)  

Simple Compensation Extends Oscillator's Range:  12/05/96 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)

Simple Interface between D/A Converter and Microcomputer Leads to Programmable Sine-Wave Oscillators:  AN-319 - Analog Devices Application Notes  (Circuit / schematic design added 6/06)

Simple sine synthesizer generates 19 kHz pilot tone for FM baseband signal:  04/14/05 EDN Design Ideas  / (added 5/05)  Low distortion, single-frequency sine source for stereo FM.

Simple Squarewave Generator:  Three switchable frequencies: 100Hz, 1KHz, 10KHz 1.5V battery operated, minimum parts counting  (circuit design added 3/05)

Sine reference is synchronous with ac line:  02/15/00 EDN-Design Ideas  / (added 2/06) 

Sine Synthesizer Generates 19 Khz Pilot Tone for FM Baseband Signal:  04/14/05 EDN Design Ideas  / (added 5/05)  Low distortion, single-frequency sine source for stereo FM.

Sine Wave Generation Techniques:  National Semiconductor Application Note 04-Nov-1995 (circuit / schematic added 2/03)

Sine Wave Generator #2:  (Electronic Schematic / circuit added 4/02)

Sine Wave Generator:  (Electronic circuit added 7/03)

Sine wave step up converter uses Class E concept:  02/17/05 EDN Design Ideas  / (circuit / schematic added 6/05)  Many power applications ranging from luminescent and fluorescent lighting to telephone-ringing voltage generators require a more or less sinusoidal-drive voltage. These applications typically require a waveform of only moderate quality, and its frequency isn't especially critical. However, avoiding waveform discontinuities that cause unwanted current peaks, excessive device dissipation, and EMC...

Sine/Cosine Wave Oscillator:  (Electronic circuit added 7/03)

Sine-wave generator outputs precise periods:  04/26/01 EDN-Design Ideas  / (added 2/06)   

Smooth Tone Clickless CW SideTone 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. (Electronic circuit added 5/02)

Specifying Quartz Crystals:  Maxim Application Notes / 726 / Dec-08  (Circuit / schematic design added 6/06)

Spot-frequency Sine Wave Generator:  300Hz, 1KHz, 3KHz "output stable" test equipment tool. 9V battery powered portable unit (circuit design added 3/05)

Square Wave Modulator has Variable Frequency and Pulse Width:  08/08/02 EDN Design Ideas  /  (added 1/05)  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 #1:  (Electronic Schematic / circuit added 4/02)

Square Wave Oscillator #2:  (added 04/05)

Square Wave Oscillator (555):  (Electronic circuit added 4/05)

Square Wave Oscillator:  (Electronic circuit added 4/05)

Square Wave to Sine Circuit:  (Electronic Schematic / circuit added 4/02)

Squarewave Generator:  Three switchable frequencies: 100Hz, 1KHz, 10KHz 1.5V battery operated, minimum parts counting  (circuit design added 3/05)

Square-Wave modulator has variable frequency and pulse Width:  08/08/02 EDN Design Ideas (added 1/05)  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....

Stable 18 MHz oscillator features automatic level control clean sine wave output:  06/23/05 EDN Design Ideas  / (added 10/05)  Analog oscillator has stable RF output.

Study of the Crystal Oscillator for CMOS CoPS:  National Semiconductor Application Note 04 Nov1995 (circuit / schematic added 2/03)

Summer Linearizes Ramp and Triangle Generators:  12/08/94 EDN-Design Ideas / (added 2/06)  The ramp generator in Fig 1a and the triangle-wave generator in Fig 1b charge capacitor C1 linearly. The key to the circuits' linearity is an op-amp adder that sums a reference voltage with the voltage on C1. For Fig 1a's ramp generator, the adder comprises op-amp IC1, R4, R5, and associated components. The adder sums capacitor C1's voltage, VCAP, via R4 with a constant voltage, VSET, via R5. (Size R2 through R4 to suit your application.) The voltage at the output of the adder is thus.... 

SwOpAmp Makes Square Wave Generator:  02/15/96 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)