Here is one another basic project call bass booster using op-amp 741 IC. The circuit bass booster increases beat frequency without affecting high frequency.
Description of Bass Booster Circuit using Op-Amp 741 IC
The circuit of bass booster shown in figure 1 is divided into two main section i.e. bypass high frequency and boost section. The input of this circuit is connected to the output of pre-amplifier circuit and it’s output to input of power amplifier circuit. When audio signal is given to the input, high frequency is passed through capacitor C1 and low frequency is passed through resistor R1. Operational amplifier IC, 741 (IC1)Â is used to boost the low frequency. Resistor R2 is used as feedback resistor where VR2 is used to control the boost power.
When high frequency signal is detected at pin 2 of IC1, it bypass to ground through capacitor C2. Switch SW1 is used to ON/OFF the boosting affect. It is necessary to used shielded wire in input and output. VR1 is used to stabilize over loading.
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Simulation of Bass Booster Circuit using Proteus ISIS:
Tips for Better Bass in Corner: The base response of a loudspeaker can be improved by placing the speaker enclosure in the corner of a room where the walls meet. the walls extend outwards and from the mouth of a huge horn, with the speaker acting as the driving source. The effect raises the acoustic load on the speaker and couples more audio energy into the surrounding air. This arrangement is especially useful for reinforcing the base tones of a small speaker.
Although the best corner to locate a speaker is one where the walls meet, do not overlook other areas that might create the horn loading effect – where a wall and ceiling meet, or at the junction of a partition or room divider and the floor. If the speaker cabinet is portable, a convincing experiment is to move it toward a corner while it is playing. The improvement noticed in the last few feet can be surprising.
PARTS LIST OF BASS BOOSTER CIRCUIT USING OP-AMP 741 IC
| Resistor (all ¼-watt, ± 5% Carbon) |
| R1 = 150 KΩ
R2 = 6.8 KΩ R3 = 100 KΩ R4 = 220 KΩ R5 = 10Ω R6 = 2.2 KΩ VR1 = 1 KΩ VR2 = 10 KΩ |
| Capacitors |
| C1 – C3 = 0.01 µF (Ceramic Disc)
C4 – C6 = 10 µF, 16V (Electrolytic capacitor) |
| Semiconductors |
| IC1 = 741 (General Purpose Operational Amplifier IC)
T1 = BC148 (General purpose silicon NPN transistor) |
| Miscellaneous |
| SW1 = ON/OFF Switch |
what is i/p & o/p For this ckt plz reply
As i had listed above “The input of this circuit is connected to the output of pre-amplifier circuit and it’s output to input of power amplifier circuit.”
Can you give some specifications regd. the pre-amplifier and power amplifier for this circuit and also some suggestions regd. them
I want to this circuit as my miniproject.Can you help me regd. specifications of i/p pre-amplifier and output power amplifer
what is the function of VR2 in this circuit.
As i had already mention in circuit description section, “VR2 is used to control the boost power.”
What is the purpose of transistor section?
In the bass booster circuit utilizing the 741 operational amplifier, the BC148 transistor (T1) functions as a buffer stage. Its primary role is to prevent overloading of the op-amp by providing impedance matching between the op-amp and the subsequent stages.
Is this circuit working in proteus?We are not getting any output
Does this circuit really work in proteus?as we are not getting any output using the same circuit..if you did any changes please specify
Thank you for your question! The circuit was successfully simulated in Proteus on our end, but there are a few key areas to double-check if you’re not seeing the expected output. Here are some steps to help troubleshoot:
Component Values and Placement: Verify that the component values match those specified in the schematic, especially the capacitors and resistors, as these are crucial for correct frequency response in audio circuits like bass boosters.
Power Supply Connections: Ensure that the power supply is properly connected and that all ground points are connected to a common ground. Often, floating grounds or misconnected power pins can prevent the circuit from working correctly.
Simulation Settings: Sometimes Proteus requires specific simulation parameters to run audio circuits effectively. Try adjusting the simulation time step or transient analysis settings to capture the frequency response accurately.
Double-Check Connections: In Proteus, connections that appear visually correct might not be connected due to missed nodes or wiring issues. Double-click each connection or use the “netlist” tool to verify that all components are correctly connected.