BC639 – an NPN medium power transistor used in driver stages of video or audio amplifiers due to its high current with 1 A maximum, low voltage with 80 V maximum, and enclosed in a TO-92 SOT54 plastic package.BC212 – a PNP complementary Silicon planar epitaxial transistor used in AF small signal amplifiers and drivers, as well as in low power universal applications.TL072 – a low noise JFET input operational amplifier with features such as common-mode input voltage range, high slew rate, operation without latch up, compensated internal frequency, high input impedance at the JFET input stage, low noise, low total harmonic distortion, protected from output short circuit, low input bias and offset currents, wide common-mode and differential voltage ranges, and low power consumption.Phono Preamplifier – an electronic circuit that equalizes and amplifies the analog output of the cartridge in a phonograph turntable where the output is increased to intensity equal to other audio sources like CDs and tapes and to restore the original signal, RIAA equalization is required.

Recording Industry Association of America (RIAA) – the trade group that represents the recording industry in the United States.

The circuit was designed to produce a hi-fi phono preamplifier circuit with RIAA equalization standard suitable for moving magnet cartridge that produces good sound.

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