This is a simple design for pre amp. But in this design, it can be used for magnetic pickup for record players. The circuit based on uA741 IC that is used as an AC coupled non-inverting amplifier operating on a single supply. The figure of the circuit is shown in below;
The operation of the circuit is 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 pickup 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.
In this circuit, there are notes for attention. First, the circuit is assembly on a good quality PCB or common board. Second, mount the IC1 on an IC base. The circuit can be powered from a 12V battery or 12V DC power supply. Up to 24 V DC can be given to power the circuit. I prefer 12 V DC. Mono sockets can be used to connect the input and output.
The operation of the circuit is 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 pickup 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.
In this circuit, there are notes for attention. First, the circuit is assembly on a good quality PCB or common board. Second, mount the IC1 on an IC base. The circuit can be powered from a 12V battery or 12V DC power supply. Up to 24 V DC can be given to power the circuit. I prefer 12 V DC. Mono sockets can be used to connect the input and output.
No comments:
Post a Comment