Simple, practical effect ----- Modulation Devices

Simple, practical effect, Modulation Devices Keywords: simple, practical effect Simple, practical effect The sound output by the instrument is processed by electrical, and then adds a special sound effect in the sound of the instrument output. Such a device is referred to as an effect. There are many types of effects, while the analog circuit is used to achieve a device that uses distortion and over-excitation. Fig. 1 is a waveform having a distortion manner, and a portion having a large amplitude is intercepted to obtain a distortion waveform. This distortion is to utilize the nonlinearity of the amplifier and diode, and the circuit is shown in Figure 2. The op amp is used to enlarge the input AC signal whose gain: AV = L + (R2 + VR1) / R1 can be adjusted within 10-1000 times. If the gain of the amplifier is high, even if the amplitude of the input signal is unchanged, the amplifier will work in the non-linear segment of the characteristic curve, and the output will still be distortion. The IC1 uses TL072. When the voltage gain is 10 times, its high frequency cutoff frequency is 300 kHz, when the high frequency cutoff frequency is 3 kHz, and the fundamental frequency of the guitar string is within 1 kHz and has been covered. When the high gain is amplified, since a small input bias voltage is also enlarged, a high DC component appears at the output, so that the DC component is suppressed with R1, C1, which is low frequency cutoff frequency FCl = 1 / 2r1c1. According to the parameters in Fig. 2, FCL = 16 Hz, is below the scope of the incident. Diodes D1 to D3 constitute an asymmetric bidirectional clamp circuit. When the switch SW1 is throws to the A end, the output waveform of the amplifier is partially cut, producing a effect tone; when SW1 is turned to the B-terminal, the output waveform is asymmetricly cut. Asymmetric waveforms, there is more harmonic components, which will produce surround sounds. The IC1b constitutes follower to isolate the effect of subsequent power discharge circuit on the effect of the effect. VR2 is used to output amplitude adjustment. This circuit is connected in series between the instrument output and the power amplifier input, suitable for the effect of the string of the guitar. Turn the scroll bar to view the full circuit ------

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