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Chip Amps Amplifiers based on integrated circuits

LM1875 Ebay dual channel pcb question
LM1875 Ebay dual channel pcb question
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Old 19th September 2017, 11:56 AM   #1
nenad88 is offline nenad88  Serbia
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Default LM1875 Ebay dual channel pcb question

Hello can someone tell me is this board any good? Have anyone tried it?

2Pcs LM675 LM1875T TDA2030 TDA2030A Audio Power Amplifier PCB Board DIY | eBay

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Old 19th September 2017, 02:17 PM   #2
AndrewT is offline AndrewT  Scotland
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Maybe the question you could ask is: does the seller/Retailer offer any customer support, or any documentation, or a schematic?
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Old 19th September 2017, 06:23 PM   #3
nenad88 is offline nenad88  Serbia
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no, they are selling bare boards
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Old 25th September 2017, 02:25 PM   #4
nenad88 is offline nenad88  Serbia
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Click the image to open in full size.
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@AndrewT does this helps?
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Old 25th September 2017, 02:39 PM   #5
OlegSh is offline OlegSh
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LM1875 Ebay dual channel pcb question
C9, C10 should have much higher values if you care to have some bass output. The BOM indicates those as 1uF but I would go even higher. Also looking at the schematic and the PCB I do not see small value decoupling capacitors next to the IC's power pins. You need them in addition to the 22uF electrolytics mentioned in the BOM for better performance.

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Oleg
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Old 11th August 2018, 08:16 AM   #6
Valeron is offline Valeron
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i have the verry same board. My issue with this is: i hear random pops in my speakers. Even when i flick cerain lightbulb switch, or the fridge starts. Any ideas on the cause?
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Old 13th August 2018, 11:05 AM   #7
Mihkus is offline Mihkus  Estonia
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You need mains filter before transformer or after transformer... Better if before on mains side.

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Last edited by Mihkus; 13th August 2018 at 11:08 AM.
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Old 15th August 2018, 01:08 PM   #8
Clueless but avid is offline Clueless but avid  Germany
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Id get the cheapest mono-kit, the one with the little blue pcb. The components are ok and the layout is really tight. No copper where it shouldn't be. Two mono- kits are not even 5/$. As transformer I'd take a 120VA (or more) toroid with 18 - 0 - 18Volts. For the first try a single transformer should do it for both amps. If you like what you hear and want more, you can upgrade 'till your purse is bleeding.

Circuit Board Handmade Mono Channel Stereo Audio HIFI Amplifier Module LM1875T 735031963917 | eBay

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Old 15th August 2018, 02:51 PM   #9
Mihkus is offline Mihkus  Estonia
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When 2 chips are in stereo configuration and on same pcb... It makes them unsymmetrical...
So dual mono configuration is a nobrainer.
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Old 21st August 2018, 05:44 PM   #10
Garygo is offline Garygo
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I am thinking of buying these kits to make a 2.1 amplifier. What would you recommend for level control ?
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