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Chip Amps Amplifiers based on integrated circuits

TDA2030 Single Supply Amp
TDA2030 Single Supply Amp
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Old 7th May 2020, 10:12 AM   #1
richinca is offline richinca  United Kingdom
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Join Date: May 2020
Default TDA2030 Single Supply Amp

Hi, this is my 1st post outside the introduction forums so here goes.

I needed an amp to drive some nice old vintage speakers I had, but didn't have a suitable amp to drive them. Taking apart some ancient PC speakers, I found a pair of TDA2030 chips and quickly knocked up a circuit on some stripboard using the datasheet and got a little amp that I'm pretty happy with. I'm powering it at 25V single-supply, from 3x 18650 cells and a DC-DC boost converter. I live off-grid, so want music without having to run the inverter.

I'm now working on making a Mk.II amp using the other 2030. I found this tutorial (How to Design and Build an Amplifier With the TDA2050 - Circuit Basics) and have followed it, reworking the bias section for single-supply and choosing resistor values to balance the bias currents:

R9 + R5 = R3 + R4 + R2//R7

I'm about to go cut out the board now, I'll update this thread with my build progress. It's probably overkill for a 2030, but will be interesting to compare the two amps.
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Old 9th May 2020, 09:06 AM   #2
richinca is offline richinca  United Kingdom
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Join Date: May 2020
Here is the board after cutting out. My workflow is to design the circuit in KiCad to get an idea of physical layout, then transfer that onto the copper with a pencil to mark out where I need to cut. The pads are then cut out using a dremel tool and a small grinding bit. I'd like to learn actual etching one day, but this is a lot neater than my normal ugly-style contstruction! I cut a really wide track between signal ground and power ground, so hopefull will get some nice isolation there.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Fitting the parts was real easy and I was doing a final continuity check for shorts with the DMM when I found a big problem.... The 2030 chip was blown, with the output shorted to earth. I de-soldered the chip and tested it and the fault remained.

Some LM1875 have been ordered, so it looks like this will turn out to be a LM1875 build instead!
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Old 12th May 2020, 07:07 AM   #3
mjf is offline mjf  Austria
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Join Date: Jan 2009
Location: Austria
you can build in a res (330ohm......1kohm or sowhat) from the
output (cap 4700uF) to ground. this closes the dc-path and
reduces the turn on bump (so the cap is not charged up only
via the speaker.....)
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