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Class D Switching Power Amplifiers and Power D/A conversion

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Old 9th August 2011, 09:24 PM   #421
lost eden is offline lost eden  United Kingdom
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Originally bought this TDA8920BTH for a ghettoblaster, thinking I could run it off +24V DC from 2x SLA - wrong! Decided to put it in a box with a cheap RS toroid & Chinese filter board rather than let it go to waste. The datasheet claims 215W 'typical' into 6R bridge at 10% THD, so >200W into 4R bridge seems not entirely impossible. I have no use for such an amp, but it was fun to build & I'm sure I'll be asked to provide a small soundsystem for a house party at some point in the future! Maybe even a sub amp if I ever decide to build a sub.

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Old 23rd August 2011, 09:01 PM   #422
fooeywuffle is offline fooeywuffle  United States
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Default Really Old Class D Amp

I built this thing around 20 years ago. It still works. I just thought maybe somebody would be interested in an Old School design. FETs at the time I couldn't get to work right, so all is bipolar transistors and J-Fet Op Amps. Power supply does have 2 of those TO-3 BUZ things driven by a transformer. It is for Bass at cutoff of 500 Cy, but is actually good to 3 Kc. 60 watts a channel. I use it to drive a pair of Eminence 18 inch woofers in my 57 Chevy.
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File Type: jpg 57.jpg (35.1 KB, 663 views)
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Old 23rd August 2011, 11:55 PM   #423
nwboater is offline nwboater  Canada
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fooeywuffle - love your 57 Chev. My parents bought an identical one new when I was in high school. Yours looks quite cherry!

Sorry for going off topic. Oh yeah, your amps are cool too!

Rod
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Old 24th August 2011, 12:12 AM   #424
ttan98 is online now ttan98  Australia
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Default Class D runs on 24V Battery

Hi,
This is my version of Class D based on Sure Electronics 50 watter, runs on TP2050 chipset.

It runs on 4*12V batteries connected 2 in series and parallel to give me 24Vdc.
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Old 24th August 2011, 04:26 PM   #425
fooeywuffle is offline fooeywuffle  United States
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My grandmother bought the 57 Chevy for me in 1967. I refurbished the whole thing myself except for the seats. painted it in my back yard. Had to add AC when I moved here to Palm Springs CA. That was a job.
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Old 4th September 2011, 10:40 PM   #426
Chris Adams is offline Chris Adams  United States
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Default hifimediy T3 mono blocks

Just finished these and they sound wonderful. Connexelectronic SMPS500Rs for power supply.

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Old 5th September 2011, 06:19 PM   #427
zerokelvin99 is offline zerokelvin99  United Kingdom
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Excuse my ignorance Chris, but is the massive capacitance between the PSU and amplifier board really needed? I was under the belief that SMPS onboard supplies were normally sufficient at supplying large amounts of power when required?

Cheers,
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Old 5th September 2011, 06:36 PM   #428
Chris Adams is offline Chris Adams  United States
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They look massive, but only in size. I removed the 10000uF electrolytic caps and replaced with 35uF film and oil ASC caps. I experimented with different caps on a Hifimediy T2 and liked the sound with the film caps. And you are correct, caps not needed with the SMPS but I wanted to keep the relay in place so I used this option.
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Old 5th September 2011, 08:10 PM   #429
zerokelvin99 is offline zerokelvin99  United Kingdom
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Thanks for the reply, I see now :-)
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Old 6th September 2011, 10:43 AM   #430
DQ828 is offline DQ828  Australia
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I found that increasing the amount of capacitance on the D class that I built helped the performance significantly, in fact the manufacture suggested it.
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