By J. Hood
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Extra resources for Audio Electronics
Collector-base leakage current noise, which is influenced by both operating temperature and DC supply line voltage 5. surface recombination noise in the base region. 32 Tape Recording Where these are approximately calculable, the equations shown below are appropriate. 59 x 10-19 Coulombs),fis the operating frequency and R the input circuit impedance. In practical terms, a satisfactory result would be given by the use of silicon bipolar epitaxial-base junction transistor as the input device, which should be of PNP type.
Several approaches can be chosen. One is to employ an amplifier with a very high output impedance, the output signal characteristics of which will not be influenced by superimposed output voltage swings. Another is to interpose a suitable high value resistor in the signal line between the record amp. and the head. This also has the benefit of linearising the record current versus frequency characteristics of the record system. If the record amplifier has a low output impedance, it will cause the intruding bias frequency signal component to be greatly attenuated in its reverse path.
Generally, however, discrete component designs will be preferred and used in high quality machines, although low-noise integrated circuit devices are now attaining performance levels where the differences between IC and discrete component designs are becoming negligible. 22. In higher speed reel-to-reel recorders, where the signal output voltage from the replay head is higher, the need for the minimum replay amplifier noise is less acute, and low-noise IC op. amplifiers, of the type designed for audio purposes will be adequate.