• Document: FET Compressor Authors: Victor Kempf, Sergey Luzan (C) 2005 The proposed compressor designed to compress the dynamic range of the signal electric guitars with passive and active electronic...
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FET Compressor Authors: Victor Kempf, Sergey Luzan (C) 2005 The proposed compressor designed to compress the dynamic range of the signal electric guitars with passive and active electronics. The compressor can be successfully used for signal processing bass guitar. In the design of the compressor the authors relied on the most simple circuitry, ensuring optimal for the guitar signal specifications. The device requires no configuration and proper installation starts immediately: Modes of DC are set automatically. Technical characteristics Table 1 Power, in: 7 ... 9 Current consumption, mA: <6 The maximum input signal, dv.ampl. (U num = 9V): 7 *** Noise given to the input mV: 2 Operating threshold (Threshold), mV: 5 ... 30 Compression ratio (Ratio): 1:1.5 1:6 ... Settling Time (Attack), ms: 1 ... 40 Recovery time (Release), sec: 0.7 ... 3 *** When using T1 cutoff 4 ... 5 V Fig.1. Schematic diagram of the compressor Amplification channel audio Channel gain is based on field-effect transistors, because, according to the authors, these devices are among the most suitable semiconductors for signal processing guitar. In this scheme was based on the principle of the shortest circuit of the signal. The input signal is fed directly to the converter resistance of T1, T2. Bias voltage of the cascade is generated automatically as T1 - a transistor with a high voltage cut-off (4-5B). The current through T1 is determined by simple current source to "malootsechnom" T2 is the initial current flow T2. Use as a current source load T1 significantly reducing distortion at the output of the repeater at work on relatively low-resistance load R 4 + R RNA. P T2 at high signal levels. The main amplifier - selected m-stage (T3, T4), to the greatest extent, in their opinion, meets the requirements of a smooth transition from linear mode to limit that provides the low noise, large gain, high linearity and harmonious distribution of the harmonic spectrum. To improve the linearity of the cascade in the origins Fri put small local environmental protection current. Next, push-pull signal is fed to the repeater, made ​on the T5 and T6 and eliminates the effect of the load compressor to work m-stage. Repeater practically does not introduce additional distortion even when the signal at the output of m- stage with a double amplitude close to the supply voltage. Regulator As a regulatory element is selected p-channel TP in the assembly KR504NT4V (KR504NT3V)-mode voltage controlled resistance. The choice of p-channel Fri caused, first of all, the ability to control this type of transistor, a positive voltage to the gate. In this case the source of the regulatory Fri connects directly to a shared bus, which eliminates any effect on the sound of chains that form in such cases, the necessary capacity on source when using n- channel controllers. The second p-channel TP in the assembly is used to generate the initial bias on the gate regulating Fri The control channel Management is implemented at the OS K1401UD2 quadruple (analogue - a common foreign Shelter LM 324), capable of working in a range of output voltages from 0 to U Pit-1, 5V. At the entrance to the control channel is added another follower, complementary Fri T7 and T8, designed to eliminate the effect of rectifying the output of the cascade compressor. OP1 collected on full-wave rectifier, which allows to obtain the output signal of both OP1 rectified half-waves with an amplitude equal to the amplitude of the signal at the output of the compressor. The signal is then fed to the repeater ER2, loaded with standard smoothing circuit "attack" - the "restoration» (Ra 1 + D 3 + R 13) + (R 14 + Ra 2) / / C7. ER3 excludes the impact of the following stages to work smoothing circuit. To ensure the most appropriate ratio of compression, the output of the repeater ER3 level control signal can be reduced by an adjustable divider R 15 R 16. Cascade on ER4 is a block correction is supplying the gate p T2 signal on half of the runoff Fri (reception can significantly reduce the distortion knob). Correction voltage is generated as follows: Stock p signal T2 is divided into a chain of R 18 R 19 and about 1 / 8 of this signal is fed to the non-inverting input of ER4. Given the fact that the non- inverting input of the KU OU4 = 4, the output signal ER4 formed with a level of about half the si

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