Hi everyone,
I'm planning my first amplifier build using a chip amplifier. I'm looking for some guidance on selecting the appropriate power supply for my project.
To help with recommendations, here are my requirements and what I'm considering:
Chip Amplifier: I've chosen the [Specify the exact chip amplifier IC I plan to use, e.g., Texas Instruments LM3886, STMicroelectronics TDA7498E.
Power Requirements: According to the datasheet, the chip amplifier requires a power supply voltage of +/- 28V, 24V DC and can deliver a maximum output power of the maximum output power per channel 50W per channel into a load impedance of the speaker impedance I plan to use 8 Ohms.
Number of Channels: I'm planning the number of channels, stereo (2-channel) amplifier.
Desired Performance: I can use it successfully and conveniently.
Based on these requirements, what type of power supply and specifications would you recommend? Are there any specific models or brands I should consider or avoid?
Thanks in advance for your help!
I'm planning my first amplifier build using a chip amplifier. I'm looking for some guidance on selecting the appropriate power supply for my project.
To help with recommendations, here are my requirements and what I'm considering:
Chip Amplifier: I've chosen the [Specify the exact chip amplifier IC I plan to use, e.g., Texas Instruments LM3886, STMicroelectronics TDA7498E.
Power Requirements: According to the datasheet, the chip amplifier requires a power supply voltage of +/- 28V, 24V DC and can deliver a maximum output power of the maximum output power per channel 50W per channel into a load impedance of the speaker impedance I plan to use 8 Ohms.
Number of Channels: I'm planning the number of channels, stereo (2-channel) amplifier.
Desired Performance: I can use it successfully and conveniently.
Based on these requirements, what type of power supply and specifications would you recommend? Are there any specific models or brands I should consider or avoid?
Thanks in advance for your help!
Good rule of thumb is 2x transformer VA for total power. 50 watts of amplifier so 100 watts of power.
2x channels 200 watts, or 200 VA transformer 160 to 180 VA common off the shelf , next jump usually 250 VA
Not like your gonna be blasting 50 watts all the time.
Normal linear power supply with basic full wave rectifier/ capacitors 20 0 20 AC transformer be close to +/_ 28 0 28 rectified DC
So 20 0 20 transformer 160 to 250 VA with linear power supply.
Likely hundreds of power supply boards on the net with basic rectifier and capacitors.
18 0 18 transformer be about 24 0 24 after rectification
20 0 20 transformer about 28 0 28 after rectification
22 0 22 transformer about 30 0 30 after rectification
either will work
Avel Lindberg transformers very common here in the states with our distributors.
Far as I know Avel Lindberg likely manufactured in your region.
2x channels 200 watts, or 200 VA transformer 160 to 180 VA common off the shelf , next jump usually 250 VA
Not like your gonna be blasting 50 watts all the time.
Normal linear power supply with basic full wave rectifier/ capacitors 20 0 20 AC transformer be close to +/_ 28 0 28 rectified DC
So 20 0 20 transformer 160 to 250 VA with linear power supply.
Likely hundreds of power supply boards on the net with basic rectifier and capacitors.
18 0 18 transformer be about 24 0 24 after rectification
20 0 20 transformer about 28 0 28 after rectification
22 0 22 transformer about 30 0 30 after rectification
either will work
Avel Lindberg transformers very common here in the states with our distributors.
Far as I know Avel Lindberg likely manufactured in your region.
Hi I'm a newbie in the diy audio as well.
Kinda curious why you chose to implement 2x mono to make up an Stereo build when TI has a bunch of stereo chips? I'm kinda puzzled if you wanted a class AB or class D amp because i saw u shortlisted Texas Instruments LM3886 (Class AB) vs STMicroelectronics TDA7498E (Class D) chip.
I also understand there was a period where amplifier design using TPA3116 (Class D) flooded all nations😱 and now there is an upgraded version. TPA3126. That would make your life easier referencing to TPA3116 designs?
Anyways, I pointed out about the classes of amp is due to the heat dissipation issues, you won't want to have real bad Johnson noise from bad thermal sink design...
Kinda curious why you chose to implement 2x mono to make up an Stereo build when TI has a bunch of stereo chips? I'm kinda puzzled if you wanted a class AB or class D amp because i saw u shortlisted Texas Instruments LM3886 (Class AB) vs STMicroelectronics TDA7498E (Class D) chip.
I also understand there was a period where amplifier design using TPA3116 (Class D) flooded all nations😱 and now there is an upgraded version. TPA3126. That would make your life easier referencing to TPA3116 designs?
Anyways, I pointed out about the classes of amp is due to the heat dissipation issues, you won't want to have real bad Johnson noise from bad thermal sink design...
This board sounds good and is ideal for your project
https://www.ebay.de/itm/40323871287...IkhxjHJTLq&var=&widget_ver=artemis&media=COPY
https://www.ebay.de/itm/40323871287...IkhxjHJTLq&var=&widget_ver=artemis&media=COPY
For a stereo setup using something like the LM3886 or TDA7498E, a regulated power supply with clean DC output is important. For LM3886, a dual rail ±28V linear PSU would be ideal, while for TDA7498E, a single 24V switching PSU (SMPS) with enough current rating (at least 4–5A) should work well. Brands like Mean Well are generally reliable. Just make sure to account for proper heat dissipation and follow datasheet guidelines. Good luck with your build!