This IC was undoubtedly chosen in the beginning by Japanese design engineers because it was one of the cheapest dual opamps on the market with acceptable audio performance.Īs such, it was used in huge volumes of Japanese audio equipment.ĭespite its questionable audio performance, it seems to be well suited to duty in overdrive circuits. Many designers included this part in some of the most successful effects like the Orange Squeezer, DOD YJM 30, Boss OD1, Tube Screamer or Peavey equipment. The first RC4558 monolithic dual opamp was developed by Raytheon Semiconductors in 1974.
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