Magnetic pickup pre-amplifier circuit

A preamplifier for magnetic pickups of record players is shown here. The uA 741 is used as an AC coupled non-inverting amplifier operating on a single supply. The amplifier gain is decided by the feedback components in which C2 controls the low frequency roll-off characteristics while C4 reduces the gain at high frequency end to compensate for the p

ickup characteristics. R3, R4 and R5 form a voltage divider to give a bias of about half the supply voltage to the non-inverting of uA741. The output at pin6 therefore stands at half the supply voltage. R5 and C3 form a supply line filter to reduce the hum level ans also to eliminate growling  in case the preamplifier circuit is operated on a common supply with other circuits.

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