Hi folks,
I’m looking to buy a mono class D board about 50W undistorted into 4 Ohms. Any recommendations for a UK seller (to reduce costs of import and shipping)?
The boards could be complete, but unpopulated is OK too.
Alternatively, can anyone recommend an good open-source layout in Kicad? Or a closed source layout with the potential to be licensable?
I’m basically trying to save time by avoiding designing the amplifier board myself, so I can focus on other parts of my current project.
I’m looking to buy a mono class D board about 50W undistorted into 4 Ohms. Any recommendations for a UK seller (to reduce costs of import and shipping)?
The boards could be complete, but unpopulated is OK too.
Alternatively, can anyone recommend an good open-source layout in Kicad? Or a closed source layout with the potential to be licensable?
I’m basically trying to save time by avoiding designing the amplifier board myself, so I can focus on other parts of my current project.
Hi,
You could use the Elektor class D amplifier based on the Infineon IRS2092 and IRFB4020 mosfet :
https://www.elektor.com/d-watt-150115-1
Farnell have the IRFB4020 mosfet in stock, but the IRS2092 IC is in short supply at the moment.
Regards,
Shadders.
You could use the Elektor class D amplifier based on the Infineon IRS2092 and IRFB4020 mosfet :
https://www.elektor.com/d-watt-150115-1
Farnell have the IRFB4020 mosfet in stock, but the IRS2092 IC is in short supply at the moment.
Regards,
Shadders.
Is 50w a hard rule because if not then you could go with Abraxilito tda8932. Gives about 25w as per Richard's design
I ought to mention Richard is far from UK based although he is a Brit. Gerbers are available for his amp or I have some spare. A lot of SMD 'warning'!
That’s a good thing (if you have a hot plate!) This thread? https://www.diyaudio.com/community/...d-tda8932-25w-8r-mono-amp-kits.359193/page-11
That's the one! That's the commercial thread, there's a link in post 1 to the development thread.
I saw this thread yesterday but kept quiet about my offering because its not really suitable for 4ohms. Into 4R, the output power would be roughly halved due to the on-board regulator current limiting. But you might try a 5A regulator like LT1084 to get more current.
Well if the OP is flexible there might be ways forward, so perhaps your optimism is better than my caution 😛
Hi! Actually I’m totally flexible. Nominal load will be 8 ohms but, but sometimes it will venture to 4 ohms or up to 16 depending on the speaker combination. So I was kind of stating the worst case.
Is the output filter the issue too?
I suppose I could use an off board supply? Making the regulator more beefy is a good option too.
Is the output filter the issue too?
I suppose I could use an off board supply? Making the regulator more beefy is a good option too.
So long as your power requirement isn't continuous, the design can be tweaked upwards for a little more power by adjusting (raising) the supply voltage. The TDA8932 itself is good for upto 36V but at that voltage it runs really rather too warm even when sitting idle due to the analog signal stages sipping almost 1.5W. The chip is designed to use the PCB as its heatsink. I run it about 21V so there is some margin left in - the 21V was chosen as about the maximum practical I could get a regulator to deliver from a nominal 24V input supply.
The output filter might be an issue, it mostly affects the HF response - with a lower impedance there's some HF 'droop' and with lighter loads, some boost. The TDA8932 has a minimum max output current of 4A, they don't say what it does typically so this'll be the limit after the regulator's beefed up.
As regards your other questions I'm happy to share design files and even do some redesign if there's potential volume but its made on easyEDA, not Kicad.
The output filter might be an issue, it mostly affects the HF response - with a lower impedance there's some HF 'droop' and with lighter loads, some boost. The TDA8932 has a minimum max output current of 4A, they don't say what it does typically so this'll be the limit after the regulator's beefed up.
As regards your other questions I'm happy to share design files and even do some redesign if there's potential volume but its made on easyEDA, not Kicad.
I didn’t realise it was one of the PCB heat sinks types. That does make it much more of a challenge. There are some nice thermal via techniques I have seen with heatsink attached on to the underside.
(I was toying with the idea of doing a Aluminium PCB, but it’s one layer only, no vias, and probably too difficult to get all the routing done.)
That’s a kind offer to share or do some designing. I think best place to start is just a stock board. Then see if the extra headroom is warranted. Would you give me an idea of costs? I guess shipping and import is an issue if not UK based. PM is fine 😊
(I was toying with the idea of doing a Aluminium PCB, but it’s one layer only, no vias, and probably too difficult to get all the routing done.)
That’s a kind offer to share or do some designing. I think best place to start is just a stock board. Then see if the extra headroom is warranted. Would you give me an idea of costs? I guess shipping and import is an issue if not UK based. PM is fine 😊
I've got boards if Richard is happy for me to send you some . I had them made at JLCPCB. There isn't a thermal pad thing to solder through to get the heat though vias. Just solder the pins
Hi Jim,
That’s super kind of you. I’m talking with Richard in PM, it might be easier if I just get a complete board from him to help do the testing quickly. But will be in touch. 👍🏻
That’s super kind of you. I’m talking with Richard in PM, it might be easier if I just get a complete board from him to help do the testing quickly. But will be in touch. 👍🏻