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Chip Amps Amplifiers based on integrated circuits

eBay TDA2030 kit build
eBay TDA2030 kit build
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Old 30th October 2018, 10:44 PM   #1
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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Default eBay TDA2030 kit build

Hi folks

I found this kit n my box of bits, don't recall acquiring it, but the bag it was in had an ebay sticker on it.

I'm dubious about the components in these kits, the TDA2030s in this one look real enough, but who knows.

The caps bother me, I probably have the right values in stash to replace them.

The power supply to this thing confuses me, it has no regulator, just a rectifier and a pair of caps.
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Old 30th October 2018, 10:48 PM   #2
Juergen Knoop is offline Juergen Knoop  Germany
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and your question is?
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Old 30th October 2018, 11:36 PM   #3
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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1. Should I trust these kit caps or substitute better quality ones?

2. How does the power supply work without a regulator? What transformer rating should I choose - the power inputs are labelled AC, GND and AC. I have no idea of the wattage rating of this amp or how much current it will draw or what voltage it needs.
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Old 31st October 2018, 12:02 AM   #4
Juergen Knoop is offline Juergen Knoop  Germany
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1. use them, hopefully the kit vendor knows his business
2. a 2x12V transformer in the 30W range should be ok and there is no need for a regulator as long you don't exceed +/-17V or so DC supply voltage for the TDA
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Old 31st October 2018, 12:09 AM   #5
DreadPirate is offline DreadPirate  United States
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Your time is better spent playing around with high quality Class D chips like the TPA3118.
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I would give it all up for just a little bit more...
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Old 31st October 2018, 12:34 AM   #6
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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I decided to ditch the kit caps as one of the Chong 3300uF was missing and one of the 22uF was deformed.

I replaced the 3300uFs with a pair of Nover 2200uF 35V, the 2.2uF with rubycon 3.3uF 50v and the 22uFs with 47uF 25V Nippon Chemicons. The 0.1uF orange caps I replaced with 1.0uF Konek MKT polyester.

I have a 2x12v toroidal that is rated for 30VA, would that suffice?

Thanks for the tip on the TPA3118, I know nothing about chip amps.
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Old 31st October 2018, 12:41 AM   #7
FauxFrench is offline FauxFrench  France
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The TDA2030 was a good chip some 20 years ago. Today, it is just a memory from the past. You already have it so get it together and gain some experience. It is hardly worth any upgrade.
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Old 31st October 2018, 12:45 AM   #8
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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It's together now, I just need to mount it onto something for testing, probably a piece of wood and hook up a suitable transformer, then cross my fingers it works!
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Old 31st October 2018, 04:23 AM   #9
asuslover is offline asuslover  Romania
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eBay TDA2030 kit build
Ian, I do believe those chips are fake....
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Old 31st October 2018, 06:43 AM   #10
PRR is offline PRR  United States
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Quote:
Originally Posted by Ian Greenhalgh View Post
...The power supply to this thing confuses me, it has no regulator, just a rectifier and a pair of caps.
Nearly ALL power amps work this way.

AC to rectifier and large cap gives DC. Not ripple-free dead clean, and varies with wall-outlet variations and amplifier demand, but with a little care in the amplifier this is perfectly satisfactory.

Most power amp topologies are fairly resistant to rail ripple. We face Collectors to the rails and the exact voltage is not critical. Heavy NFB reduces what sneaks in.

Adding regulators forces loss of voltage. At the high current of a Power amp, this is major added power required and major added heat. Dollars spent on bigger power transformer, regulators, heatsinks can instead be applied to the power amp's PSRR. Throw in some current-sources, R-C filter input stages, the tricks are endless.
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