Hey guys, I am totally new to the game and I've been looking for a while to try and find information to help me build a class D amp to power some speakers 4ohm rated at 45watts I have at home.
My requirements for the system are 30w x2 channels using a 12v DC supply and a 3.5mm audio jack. I would like to use readily available parts and since its my first time I am not too phased about over complicating it and having extremely good quality but I don't want it to sound like a tin can😆😆. If anyone has previously posted a thread that could help or would like some more information from my side and is willing to share their knowledge, Please let me know and I look forward to joining this community!!
My requirements for the system are 30w x2 channels using a 12v DC supply and a 3.5mm audio jack. I would like to use readily available parts and since its my first time I am not too phased about over complicating it and having extremely good quality but I don't want it to sound like a tin can😆😆. If anyone has previously posted a thread that could help or would like some more information from my side and is willing to share their knowledge, Please let me know and I look forward to joining this community!!
There's nothing wrong with a tin can attached to a bit of string. It sounds better than some of the designs on here !
Have you checked out Aliexpress for an off-the-shelf product?
Have you checked out Aliexpress for an off-the-shelf product?
Your post is good intended but aren't we all DIY-ers?
I'm sure some good designs must exist here. 🙂
Hugo
The OP said he was 'new to the game' although he doesn't say what his experience is.
Class D amps use SMD chips I believe so not for a beginner.
A kit might be okay but from scratch - no way without the experience and soldering SMD skills.
Photos of pcb's on Ali will give him an idea of what's involved.
Class D amps use SMD chips I believe so not for a beginner.
A kit might be okay but from scratch - no way without the experience and soldering SMD skills.
Photos of pcb's on Ali will give him an idea of what's involved.
I think the thread starter might just want to connect a finished class d module and build an enclosure.
A tpa311x module from ali or amazon is probably perfect for this application!
A tpa311x module from ali or amazon is probably perfect for this application!
Yes, might, his choise.
Meanwhile, browsing the net I found this:
https://www.allaboutcircuits.com/projects/how-to-build-a-class-d-power-amplifier/
Even if Brix78 wants a Ali kit, there's some usefull info about ClassD.
Along the way, he might learn a thing or two 🙂
Hugo
Meanwhile, browsing the net I found this:
https://www.allaboutcircuits.com/projects/how-to-build-a-class-d-power-amplifier/
Even if Brix78 wants a Ali kit, there's some usefull info about ClassD.
Along the way, he might learn a thing or two 🙂
Hugo
I would like to build one hence why I don't want an off the shelf Amp. I am currently studying mechatronic engineering and although I have good idea about how amps work, components and yes soldering skills, the course is fairly limited and this is a project for me to expand my knowledge.
As I have now mentioned I have some skills but all theoretical and I really want to put some practical experience to them. I have thought of a kit but for me I see it almost as an easy way out of that makes sense but I am considering it 😂
As I have now mentioned I have some skills but all theoretical and I really want to put some practical experience to them. I have thought of a kit but for me I see it almost as an easy way out of that makes sense but I am considering it
the link explains the principles in a nice way, but the practical circuit is quite basic.
A fixed frequency pwm with LMC555 as sawtooth generator provides bad linearity.
LM393 comparator are the cheapest and worst available etc.
No protection circuits in sight - etc
All in all this might work - but with mediocre sound quality.
If Brix would like to build a ClassA amp, I would be able to point him to a few good and simple designs.
Unfortunately, I have no experience with ClassD but I'm sure you could do the same.
If you know which ones to avoid, you surely must know the better ones, without SMD 🙂
Hugo
Unfortunately, I have no experience with ClassD but I'm sure you could do the same.
If you know which ones to avoid, you surely must know the better ones, without SMD 🙂
Hugo
I would definitely avoid Class D and make an A or AB for your first project possibly using one of the LM3886/1875/ TDA7377 chips in BTL mode.
https://www.diyaudio.com/community/threads/best-12-volt-amplifier-chip-for-portable-amp.322682/
https://www.diyaudio.com/community/threads/best-12-volt-amplifier-chip-for-portable-amp.322682/
Any chance you have links to a circuit diagram? I believe a class A Amp is very clear just not very efficient but should be OK for my purposes
I build myself a JLH and I have yet to find a better sounding amp. And I heard many.. 🙂
It's only 2X 10W but plenty for my use.
https://sound-au.com/tcaas/index.htm
It's only 2X 10W but plenty for my use.
https://sound-au.com/tcaas/index.htm
Yes I like the JLH amps. I built the high power ESL version a few years ago but it wasn't really upto the job of driving a complex load like a hybrid ESL (ML Aeons)
BUT you can't run them off 12v DC so will need to rethink your power supply.
PCBs are widely available on ebay etc.
BUT you can't run them off 12v DC so will need to rethink your power supply.
PCBs are widely available on ebay etc.
I'm sure a good SMPS would do. 🙂
Cheap and available in many voltage and current varieties.
I build mine with an existing F5 supply and only had to switch boards.
Cheap and available in many voltage and current varieties.
I build mine with an existing F5 supply and only had to switch boards.
I swapped the 500va linear supply of my Krell KSA50 clones for a pair of 300w 'audio grade' + -36v SMPS from this company:
https://hifimediy.com/product-category/power-supplies/
I was testing them yesterday and was happy with the noise spectrum and level.
They seem expensive, but a 500va Toroid, rectifiers, and .1F of smoothing caps wasn't much less and both of the SMPS modules fit inside the amp chassis.
They also have a +-12v output which I used to operate the speaker protection and drive a 5v cooling fan via a separate small LM317/337 regulator module.
https://hifimediy.com/product-category/power-supplies/
I was testing them yesterday and was happy with the noise spectrum and level.
They seem expensive, but a 500va Toroid, rectifiers, and .1F of smoothing caps wasn't much less and both of the SMPS modules fit inside the amp chassis.
They also have a +-12v output which I used to operate the speaker protection and drive a 5v cooling fan via a separate small LM317/337 regulator module.