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Category: Oscillator Circuits / Sine wave Views: 2425 Rank: 0 A voltage-output DAC normally generates an output voltage that is a fraction of the input-reference voltage. In many designs, however, it is necessary to multiply the input voltage by a programmable gain, or, in other words, to create a variable-gain stage. You can easily implement a variable-gain stage using a low-cost voltage-output DAC (Figure 1). visit page.
Related circuits Sine reference is synchronous with ac line Many applications require a sinusoidal reference voltage synchronized to the ac line voltage. You cannot derive such a reference voltage directly from the ac line because the waveform of the ac line is distorted because of nonlinear loads connected to the line and because the amplitude of the... 18-MHz oscillator with automatic level control A recent Design Idea described a method for designing simple, high-frequency LC oscillators with few passive components (Reference 1). However, for best results, practical hardware design of a stable oscillator requires more parts and greater complexity. Figure 1 shows a stable, 18-MHz oscillator... Function Generator Sine / Triangle / Square / Saw ( PIC16F870 ) After the recent demise of our multifunction signal generator, we decided to make one of our own. The circuit uses a PIC16F870 (about $3), an R/2R resistor ladder network (for a real fast and cheap D/A), and a few other parts. You can check out the schematic and the current source file. Also... synthesizer generates 19-kHz pilot tone for FM baseband signal This Design Idea presents a low-cost method of generating the basic 19-kHz pilot tone. The 19-kHz pilot tone comprises a baseband signal, and the L+R and LR signals consist of DSBSC (double-sideband-suppressed-carrier) modulation centered at 38 kHz. For a receiver to correctly demodulate the... Very Low Distortion Oscillator This oscillator uses a bridge circuit with an optoisolator as a gain-control device. The resultant distortio Cascading two identical integrators will thus result in an overall phase shift of 180° and an amplification of unity (p U1A, an op amp, oscillates at the frequency at which the phase shift in the Wien bridge network is exactly zero degrees. Changing bridge component values changes the oscillator frequency. In this circuit, we need change only the two resistors to do this. S1A chooses a value among Rl through R6,... Simple compensation extends oscillator`s range A simple technique provides phase compensation for the oscillator in Figure 1a. In this circuit, a tungsten lamp regulates the amplitude of a crystal bridge oscillator. This type of oscillator produces a very low-distortion output at a very stable frequency. The op amp must have a negligible... Arduino pwm output to 0-10V for dimmable ballasts
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