The Circuit Works
The complexity of the circuit is at an advanced level, it is not recommended for those who don't have experience in electronics and in assembling amplifier circuits, you must have minimal knowledge at an advanced level to assemble this type of power amplifier.
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Fig. 2 - Schematic diagram 440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 Transistors |
The Power Supply
In Figure 3 below, we have a suggestion for a power supply that we use in our projects. In this article, besides having the schematic diagram with the Printed Circuit Board, you will understand how to easily calculate your own Power Supply, with the desired voltage.
You can in the link below:
Fig. 3 - Symmetrical Power Supply for Power Amplifiers |
Components List
- Semiconductors
- U1 .......................... TL071 Integrated Circuit
- Q1 .......................... BD139 NPN Transistor
- Q2 .......................... BD140 PNP Transistor
- Q3, Q4, Q5, Q6 ..... IRFP9240 Mosfet Transistor
- Q7, Q8, Q9, Q10 ... IRFP240 Mosfet Transistor
- D1, D2 ................... 1N4744 15V Zener diode
D3, D4 ................... 1N4148 diode
- Resistor
- R1, R33 ................. 47KΩ (yellow, violet, orange, gold)
- R2 .......................... 1KΩ (brown, black, red, gold)
- R3, R4 .................... 2K7Ω (red, violet, red, gold)
- R5, R6 .................... 2KΩ (red, black, red, gold)
- R7 ........................... 6k8Ω Trimpot
- R8, R9 .................... 22KΩ (red, red, orange, gold)
- R10, R11 ................ 33Ω (orange, orange, black, gold)
- R12, R13 ................ 220Ω (red, red, brown, gold)
- R14, R5 .................. 820Ω ( grey, red, brown, gold)
- R16 ......................... 3.3Ω (orange, orange, gold, gold)
- R17, R18, R21, R22, R25, R26, R29, R30 .... 39Ω (orange, white, black, gold)
- R19, R20, R23, R24, R27, R28, R31, R32 .... 5W 0.33Ω (orange, orange, silver, gold)
- Capacitor
- C1, C5 .................... 100pF Ceramic Capacitor
- C2, C6, C7 .............. 1uF Ceramic Capacitor
- C3, C4, C9, C10 ..... 470uF / 65V Electrolytic Capacitor
- C8 ........................... 100nF Ceramic Capacitor
- Miscellaneous
- P1 .......... 2-pin PCB soldering terminal blocks
- P2 .......... 3-pin PCB soldering terminal blocks
- Others .... Printed Circuit Board, heat sink, wires, etc.
- Semiconductors
- U1 .......................... TL071 Integrated Circuit
- Q1 .......................... BD139 NPN Transistor
- Q2 .......................... BD140 PNP Transistor
- Q3, Q4, Q5, Q6 ..... IRFP9240 Mosfet Transistor
- Q7, Q8, Q9, Q10 ... IRFP240 Mosfet Transistor
- D1, D2 ................... 1N4744 15V Zener diode
D3, D4 ................... 1N4148 diode - Resistor
- R1, R33 ................. 47KΩ (yellow, violet, orange, gold)
- R2 .......................... 1KΩ (brown, black, red, gold)
- R3, R4 .................... 2K7Ω (red, violet, red, gold)
- R5, R6 .................... 2KΩ (red, black, red, gold)
- R7 ........................... 6k8Ω Trimpot
- R8, R9 .................... 22KΩ (red, red, orange, gold)
- R10, R11 ................ 33Ω (orange, orange, black, gold)
- R12, R13 ................ 220Ω (red, red, brown, gold)
- R14, R5 .................. 820Ω ( grey, red, brown, gold)
- R16 ......................... 3.3Ω (orange, orange, gold, gold)
- R17, R18, R21, R22, R25, R26, R29, R30 .... 39Ω (orange, white, black, gold)
- R19, R20, R23, R24, R27, R28, R31, R32 .... 5W 0.33Ω (orange, orange, silver, gold)
- Capacitor
- C1, C5 .................... 100pF Ceramic Capacitor
- C2, C6, C7 .............. 1uF Ceramic Capacitor
- C3, C4, C9, C10 ..... 470uF / 65V Electrolytic Capacitor
- C8 ........................... 100nF Ceramic Capacitor
- Miscellaneous
- P1 .......... 2-pin PCB soldering terminal blocks
- P2 .......... 3-pin PCB soldering terminal blocks
- Others .... Printed Circuit Board, heat sink, wires, etc.
Fig. 3 - 440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 Transistors |
Files to Download, Direct Link:
If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.
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My Best Regards!!!
Hi can you mention the resistor wattage details
ReplyDeleteHello SRIRAM!
DeleteAll resistors are 1/8W, except resistors R19, R20, R23, R24, R27, R28, R31, R32. which are 5W.
My best Regards!
Hi!,
ReplyDeleteI orded some pcb's via pcbway. Just finished populating them. I can't really makeup out of the schematics where the V+ and V- should be connected on the pcb. Should the V+ be on the top left corner of the pcb?
Hello @MARIUSM
DeleteThe +Vdc is the one that sits next to the bolt support hole, you looking facing the connector, and the left side. My regards.
Hi!, I ordered pcb's via pcbway. Just finished populating them. If I plug in the power connector the mosfest gates keep shorting themselfs, if I unplug the powercable the short is gone. Any idea why that happens?
ReplyDeleteHello @MARIUSM,
DeleteThis can be numerous problems, but on the part, check carefully if there is any inverted component, if there is any component in short, if the connections are correct, or if it has any component that is not original.
My best regards.
Hi!, to what value should is ajust the potentiometer?
ReplyDeleteHello @MARIUSM,
DeleteThe Bias setting should be measured with the multimeter on the transistor Q1 between base and emitter, a voltage of approximately 600mV.
My best Regards!
Hi, thanks for the information! I didn't knew the commenting took this long, apologies for the many comments. The potentiometer I used wasn't precise enough. I checked the signal with a function generator and a oscilloscope. Distortion can happen very quick in this design. Also the footprint of the 470uf elco sitting right after the main power lines, is quite small. Elco's with a voltage rating of 63V are bigger. Also the drill holes in the corner of the pcb are very tiny. Besides that does it sound very clean.
ReplyDeleteHello @MARIUSM
DeleteWe greatly appreciate your feedback!
Messages often take time, due to hundreds of messages of "Span messages", which they send with an associated link.
Unfortunately, this disturbs others who need to communicate with us.
Every day, we are trying to improve our website, which has been growing a lot.
Don't worry, feel free to send messages, and we can discuss matters pertaining to the circuits.
Best Regards!