November 2007
Intermediate to advanced
736 pages
46h 32m
English
Content preview from Consumer Electronics
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AGC CIRCUIT FOR TAPE RECORDERS
When recording on tape, the current in the recording head must not exceed the value at which tape saturation occurs if severe distortion is to be avoided. This can be prevented by monitoring the current by means of a meter or l.e.d. and manually adjusting the recording level. Another method is to use a circuit that electronically reduces the gain of the amplifier when the optimum recording level is exceeded.
Fig. 16.8 Bias and erase power from two oscillators with locked frequencies for stereo operation
To ensure that the distortion is recorded for only a short time, the gain control must respond very rapidly ...
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