摘要：数的运算放大器和一些外部元件，您可以建立具有可变频率和占空比的脉冲发生器。Maxim/Dallas > App Notes > AMPLIFIER AND COMPARATOR CIRCUITS AUTOMOTIVE Keywords: pulse generator, VCO, voltage controlled oscillator, op amp, operational amplifier, frequency, Mar 26, 2003 square wave, opamp, op amps APPLICATION NOTE 1960 Simple Pulse Generator Has Low Parts Count With a few op amps and some external components, you can build a pulse generator with variable frequency and duty cycle. The natural choice for generating a pulse of variable frequency and duty cycle is a good bench-top pulse generator. If you don't have a generator or must build one into your system, however, you can do it with a few op amps and some external components (Figure 1). Figure 1. This simple and versatile pulse generator includes only 15 components. U1 and Q1 form a voltage-c……