Man I buy a lot of shit and quite a bit stays unused that i wouldn’t mind giving away
I just clicked on this link and got blocked by robu.
Blocked, what does it mean? Link works fine for me.
I like where you’re going with this but its beyond my scope.
Right now I have things pretty much decided so most of my questions will come after I have something to show/hear.
I’m trying to keep cost down and be beginner friendly. One step at a time.
Not sure what is going on. I am using the corporate zscalar VPN. Seeing the ‘Sorry, you have been blocked’ from cloudflare.
The public IP address is different today. Still no access. IIRC, I had bought some stuff from them a few months ago using the same PC and VPN.
Could someone using zscalar check if they can access the site? The public IP is one of their chennai gateways.
I went down the rabbit hole and made a few changes. Dropped all the cutting cables stuff.
Went to the local market and picked up the boards. Will recommend buying online instead for single piece.
PAM8610 x2
Smd bass treble board
Bluetooth micro usb 5v board
Forgot to take jst wires and knobs from local. Don’t know if they were supposed to be included with bass treble board.
Ordered some stuff from Makerbazar.in
- Knobs x2
- 4 way speaker terminal block x2
- Female DC jack connector
- Male DC screw type connector
- 3.5mm audio jack module
- Micro power switch with led 4 leg
- JST female 3 pin with wire x2
- JST female 2 pin with wire
- Spade lug crimp connectors 2.8mm x10
Spend so far
- Boards 360rs (local)
- Speakers 120rs (giveaway)
- Usb charger 5v 2a + aux cable x2 150rs (giveaway)
- Makerbazar.in 215rs (including 60rs shipping)
I have
- Power adaptor 12v 4a
- Micro usb cable
- Ferrero plastic box
Bluetooth and amp will be separate with their own power supply and connected via 3.5mm aux cable. Volume control will be from source. Amp box will be plug and play (dc jack, 3.5mm jack and speaker terminal). Easy to upgrade/test speakers and higher spec adaptor.
Bluetooth is complete unit and it works fine from my limited test.
While I wait some advice needed.
All the boards are 12v. Bass treble board has separate audio in and audio out. Also has all jst connector so can wire double (jst + under board) easily.
How should I wire all this up and will it matter?
Power
- Female dc jack > power switch > all 3 boards direct
- Female dc jack > power switch > bass treble (jst) > PAM8610 > PAM8610
- Female dc jack > power switch > PAM8610 > PAM8610 > Bass treble (jst)
Audio
- 3.5mm module > bass treble in (jst) > out (both jst and under board) PAM8610 x2
- 3.5mm module > bass treble in (jst) > out (jst) PAM8610 > PAM8610
I have forgotten to buy basic/speaker wire. Will get this done at a friend’s office next week, then take it from there. His staff has solder experience/tools but limited knowledge.
Note - there are lots of audio boards out there, do make a note of their power voltage requirements. Eg the tpa3110 is another 15w+15w board but it needs 24v power to run as per specs.
Your bluetooth module is 5V.
Best I guess would be in star configuration.
From 12V adapter
- One positive-negative pair to 1st PAM8610
- One positive-negative pair to 2nd PAM8610
- One positive-negative pair to bass treble board
Make sure your positive negative pairs are twisted like this, so it somewhat reduce the noise.
For your audio signal, from the source, which could be your bluetooth module.
- it will go to the IN of the bass treble board
- then from the OUT of the bass treble board to both the IN’s of the PAM8610, similarly like before, two pairs.
One thing is for sure, after seeing the result, you will either never do anything like this ever again, or you will be hooked to make more stuff. 
Either way you will learn a lot.
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Update - I did all of this on thursday at a friend’s office. His staff did it on my instructions.
Things I forgot to buy
- nuts for the knobs
- speaker wire (fiend had these) + twisting
- thimble for power switch (bigger size)
- somehow lost the nut that came with the power jack
- heat shrink tube (friend had these)
- heatsinks
- proper 3.5mm female jack (couldn’t find any)
We made the whole amp without speaker terminal. I checked with one speaker connected direct to a board and it sounded fine, then did the rest speaker terminal wiring. Didn’t have time left to test and took it home.
At home I realized there is noise, same with source (3.5mm) plugged or not. From zero to low volume (laptop control) it is audible (annoying) and at mid to high volume, I can’t hear it but I know it’s there. Separately there is also random loud grounding noise, and I have to move things to get rid of it. This is probably a wiring issue somewhere.
The always on noise could be from the chip (pam8610) itself, there are online reviews complaining of the same. It could also be from the tone board or all 3 boards. Will try swapping out with another amp (tpa3110) later.
While fiddling I broke the aux module wires, it was hot glued and came off, so further troubleshoot is on pause till I get time to meet my friend again, will probably buy the tpa3110 before then.
The speakers did sound loud and great for what they are. Used with laptop connected via aux. I’m happy with the experience but will most likely go for complete diy amps in future.
Help - I got confused with audio wiring. The tone board has 3 pin jst (no marking), audio in and out and the wire I have is red brown black. I presumed these are red - right, brown - ground, black - left. I connected audio in to the 3.5 module incorrectly (TRS- RLG instead of TRS-LRG). Tone control audio out 3 pin jst to the amp and direct from under board to second amp. Again with red - right, brown - ground, black - left. Followed the color from the tone board as thats fixed. Surprisingly balance on laptop was correct, right for right speaker and left for left speaker. I have wired something wrong.
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This was inevitable.
But there are ways to improve.
- You main power supply could be noisey. One way is to isolated power supply for each module. Or in fact removing the bass treble board temporarily to see the results.
- Thin ground wires can pick up all kinds of interference, thicker gauge can help.
- Some kind of filtering circuit.
I am not an audio expert either, but from what I have seen, issues like this are pretty typical in first time projects. It’s all about trial and error, and you will likely need to iterate on your setup to get everything dialed in.