Table of Contents:ġ.2.1 Long Tailed Pair Differential Amplifier. Despite its questionable audio performance, it seems to be well suited to duty in overdrive circuits. As such, it was used in huge volumes of Japanese audio equipment. 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. 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 4558 dual amp is linked with the history of the guitar pedals development. The first RC4558 monolithic dual opamp was developed by Raytheon Semiconductors in 1974. This chip has industry standard pinout, meaning that there are several different suppliers manufacturing pin compatible 4558 devices and also it can replace other standard dual op-amps like the TL072, NE5532 or the OPA2134. The high voltage gain (100 dB typ.), good input impedance (5 MΩ typ.) and versatile power supply (± 4 to 18 Volts) make it perfect to fit in pedal circuit designs. The JRC4558 integrated circuit by Japan Radio Company is a dual operational amplifier internally compensated and constructed with bipolar transistors on a single silicon chip.
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