high GAIN stereo bass TREBLE Board Price list

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This Bass Treble and Gain circuit was designed by Respected Peter J Baxandall , 

You will find many versions of it on Google and able to make most of them on this PCB. 

The Stereo Gain circuit is powerful enough to run any type of amplifier.

• Bass Treble Boost / Cut -   15dB symmetrical curve Boost / Cut. 1khz cutoff  frequency. 
• High signal GAIN -  17dB signal GAIN.  9 volt Peak to Peak Max output.
• Universal amplifier usability - can be used with any amplifier made of IC or transistors.
• On-board regulated power supply - Full wave rectifier, 3 voltage regulators. 
• USB / Bluetooth connectivity - +5 Volt regulated supply to use USB / Bluetooth audio modules,.
• Standard Components -  All components used are available online or at your local electronics store.  
• No SMD components - Only through hole components used, making soldering and replacement hassle free.  
• Cost effective - This amplifier can be made in a fraction of cost compared to similar amplifiers available in market. 

                                                                           CLICK HERE to download high gain stereo bass treble circuit diagram 

This circuit has three main sections namely - Regulated power supply, Bass treble section and Gain section.

Regulated power supply section -

AC input supply at J3 is converted to DC by diode D1,D2,D3,D4 and filtered by C3,C4,C5,C6. voltage regulators U1 and U2 give fixed output of +15 & -15 volts respectively. 

U3 is used to provide +5 volts to USB, Bluetooth or any other type of audio modules. regulated dual supply from DC jack J6 can be used for other applications. 

in simple words, regulated supply section converts AC to DC and provides +15v & -15 volts supply to other sections. +5 volt for other applications.

Bass treble section - 

This classic bass treble circuit designed by respected Peter J Baxandall was First published in Wireless World in 1952. You can see, nothing significant has changed since then. the following description is for one channel.

Input signal received through C1. At high frequencies the impedance of C12 is small and the bass control RV2 is effectively shorted out and R7, R8 give unity GAIN. At low frequencies RV2 is active with maximum boost / cut is set by end-stop resistors R7, R8.

At high frequencies again, C10 has a low impedance and treble control RV1 is active, with maximum boost / cut is set by end-stop resistors R3, R4. at low frequencies C10 has a high impedance, so RV2 has no effect.

U4 works as negative feedback amplifier. the amplified signal is sent to next stage. 

in simple words RV1 is active at high frequencies and RV2 is active at low frequencies thus we get boost / cut in treble and bass respectively.

GAIN Section-

Another great circuit of respected Peter J Baxandall. this GAIN circuit amplifies the input signal to drive power amplifiers with minimum noise and distortion.

U5B U6B works as buffer and gain of U5A U6A is determined by R20 R22 & R21 R23 respectively. C20 & C21 ensures high frequency stability. this shunt feedback amplifier has gain of 17dB regulated by preset RV3 &RV4.

in simple words, signal received from bass treble section is amplified by ic U5 & U6. output at J5 can be connected to any power amplifier input.

Bengal Tiger - 400 watt hifi amplifier board, high performance and ultra low distortion for power applications.

Macaque - 200 watt hifi amplifier board, similar ultra low distortion circuit for medium power applications.

Tusker - 100 watt TDA7294 amplifier board, Single ic, compact size amplifier for low profile high power applications. 

Fox2 - 20 + 20 watt TDA2030 stereo amplifier board, low cost solution for low power stereo amplifier applications.

• Full wave Diode Bridge Rectifier
• Triple Voltage regulators
• 12v to 15v  Positive and Negative voltage regulators can be used
• +5v dedicated supply for USB / Bluetooth Audio modules.
• 12 0 12 or 15 0 15 VAC 500 mA Transformer Recommended.

• Baxandall type Symmetric Tone Control 
• Maximum Bass Boost - 15 dB
• Maximum Treble Boost - 15 dB
• Phase -Inverted  Phase output
• Cutoff  Frequency - 1 Khz

• Shunt Feedback gain circuit
• Maximum Gain - 17 dB
•  Phase - Inverted Phase output 

          IC 

• U1 - L7812, L7815

• U2 - L7912, L7915

• U3 - L7805

• U4, U5, U6 - NE5532, TL072, JRC4558, LM833, OPA2134

   * - Please read datasheet carefully before use.  

•  Type of PCB  - Single sided, Glass Epoxy FR-4 Grade A  
• PCB size -  90 mm x 90 mm ( 3.5 inch x 3.5 inch ), PCB Thickness = 1.6 mm 
• Thickness of copper on PCB - 35 micrometer 

PCB designed with thick copper tracks & large solder pads to facilitate straightforward  placement and soldering of components.