Frequency Doubler Operates on Triangle Waves #2:  12/05/96 EDN-Design Ideas / (added 10/06)

Frequency Doubler Operates on Triangle Waves:  03/14/96 EDN-Design Ideas / (added 10/06)

High fidelity triangle Wave generator consumes only 6 µA:  10/16/03 EDN Design Ideas  /  (added 10/06)  Ideal triangle waves involve infinite d2V/dt2, so high-fidelity triangle waves entail very high bandwidths. Micropower circuits have fairly low bandwidth, so generating good triangle waves with such circuitry becomes problematic. The circuits of Figure 1 show two methods of generating triangle waves....

Precise Triangle Wave Generation:  National Semiconductor Application Notes,28-Jun-1996 / (app note added 3/03)

Scheme yields Frequency Locked Triangle Waves:  02/02/98 EDN-Design Ideas / (added 3/03)  The circuit in Figures 1 and 2 generates frequency-locked triangle waves of constant amplitude. It uses readily available TTL and other older-technology parts.  The circuit portion in Figure 1 comprises the frequency dividers, counters, and converter. The portion in Figure 2 contains current sources, output circuits, ....

Summer Linearizes Ramp and Triangle Generators:  12/08/94 EDN-Design Ideas / (added 3/03) 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.... 

Transconductance amp gives Oscillator reciprocal response:  04/17/03 EDN Design Ideas  /  (added 1/05)  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:  The Tri-Waveform Generator can be used for a number of different uses. The one that I use it for is a signal generator to test circuits. The frequency range is 20 to 20khz. and can be adjusted by R1. The duty cycle or the time that the waveform is high and the time that the waveform is low can be adjusted by R4. The purpose of R2 and R3 are to clean up any distortion on the sine wave output. To do this you must hook up the sine wave output to and oscilloscope and adjust R2 & R3 to make the sine wave as accurate as possible. (added9/04)

Triangle and Square Wave Generator:  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. Triangle amplitude can be altered by adjusting the 47K resistor, and waveform offset can be removed by adding a capacitor in series with the output. (added 3/03)

Triangle and Squarewave Generator:  (circuit / schematic design added 6/06)

Voltage Controlled Triangle/Square Wave Generator:  (circuit added 10/06)