This circuit allows the use of a common cassette to pass the tape recordings to other media with the appropriate equalization (NAB). The circuit must be powered by a 30 V supply, but the consumption is only a few milliamperes. Input cables and output cables must be shielded. The numbers in parentheses are for the second channel of the integrated circuit. The circuit is suggested by National Semiconductor. We note that the LM381 is no longer a very common component in our market. The reader should check their availability before leaving for assembly. On board layout keep the shortest possible paths to occur no noise problems. This circuit allows you to use a tape to pass the tape recordings to other media with the appropriate equalization (NAB). The entrance has a sign with level sufficient to excite the most common amplifiers.
