2.1 TDA2030 amp from ebay

[eladmi]

Hi,

I just bought this amp from ebay (TDA2030A 2.1 AUDIO POWER AMPLIFIER KIT 18W+18W+36W A59 bei eBay.de: Amplifiers (endet 04.12.10 15:29:08 MEZ)). II would like to build my first diy amp with this kit. I have a few question though. Will it be possible to swap the TDA2030 with TDA2050 chips? What would be a proper heatsinks for those chips? I was thinking about two 16V 4.5A notbook chargers as power supplies (FOR 16V 4.5A IBM THINKPAD T42 2374 2373 CHARGER ADAPTER on eBay (end time 19-Dec-10 08:29:42 GMT)). Will those work?

Sorry for those (probably) silly questions!

Thank you

eladmi

[eladmi]

Can I directly attach a troroidal transformer with 2 x 12 V? I was thinking about 120 VA.

Thank you

[abraxalito]

There are 4 chips but only 3 outputs. Do you have a schematic?

Yes, its possible to use TDA2050s in place of the 2030s, then you could run at a higher output power, capacitor voltage ratings permitting. Myself, I'd go for the TDA2030a as its better bang for the buck. The kind of heatsink size you need would be very roughly 100mm square with 20mm long fins, black anodized finish.

A 120VA transformer at 12V won't be suitable unless you're going to use the TDA2030a or TDA2050 - its output voltage will be potentially too high for the 2030.

<edit> Ah, I see the design already uses TDA2030a. The TDA2050 won't give much improvement in output power into 8R as it has just 3V higher supply rating. It will give more improvement into 4R as its output current limit is 5A vs 3.5A for the 2030a.

[Minion]

Originally Posted by abraxalito

There are 4 chips but only 3 outputs. Do you have a schematic?.

I believe that 2 of the chips are in Bridge mode for a subwoofer .....

[abraxalito]

Originally Posted by Minion

I believe that 2 of the chips are in Bridge mode for a subwoofer .....

Aha, well then the subwoofer really can't be lower impedance than 8R. Better to fit the TDA2050 into these positions to get better current output, the two bridged TDA2030as will be panting a little...

[eladmi]

Thanks for the replies.
The 2 tda2030 for the sub seem to be bridged. I will attach a schematic as soon as i get the kit. I already orderd 4 TDA2050. They were really cheap. Is it poosible to connect the toroidal transformer directly to this pcb? Would it be a good idea to swap the 6800U/25V capacitors with 10000U/25V-35V?

eladmi

[eladmi]

Hi,

I got my kit today. But there is NO complete schematics or wiring diagrams. There are some information from the manufactures website http://www.xydzy.com . I will post more details on this tomorrow.

part list via google translate:

Supporting double-sided circuit boards x 1
6700U/25V capacitor (Japan Chemical) x 2
0.1u capacitor CBB Thomson metal x 4
Thomson 1u metal CBB capacitor x 2
680 European metal film resistors x 4
22K metal film resistors x 10
1 euro metal film resistors x 4 ???
22u electrolytic capacitor on chemical x 6
50K stereo potentiometer x 1
Plum socket (red, white and 1) x 2
TDA2030A or 1875 x 4
NE5532P x 2
4A/600V rectifier bridge x 1
Terminal Block 2 x 2
Terminal Block 3 x 1
Fixed columns and exquisite metal screws 1 set
Insulating silicone sheet x 4
Insulating Aprons x 4
Kit assembly instructions x 1 (no real instruction though)



Some schematics I found on the website:




bridged TDA2030a



power unit

eladmi

[eladmi]

Some more pics including the installation instructions







regards

eladmi

[pacificblue]

Since rectifier bridge and smoothing caps are present on the PCB, you should directly connect a transformer to it. The second picture in your post #7 shows that the manufacturer recommends 2 x 10-12 V AC voltage.

Replacing the smoothing caps with bigger ones won't hurt, if they fit.

[eladmi]

I got an 2 x 12V 120VA toroidal transformer with soft start. Do I have to change any resistors if I would like to use the TDA2050 chips?

Thanks

eladmi