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Class D Switching Power Amplifiers and Power D/A conversion

Tiny TAS5558 +TAS5624 "Power_DAC"+SMPS
Tiny TAS5558 +TAS5624 "Power_DAC"+SMPS
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Old 26th March 2018, 12:07 PM   #11
irs20957 is offline irs20957  Russian Federation
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Quote:
Originally Posted by IVX View Post
Total: about $20 for PCBA.
This BOM very cheap for home made.
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Old 26th March 2018, 02:34 PM   #12
IVX is offline IVX  Ukraine
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well, I had Pro audio project with similar BOM cost, however, it was 2-way monitor 400W+100W + DSP+BT_TWS/aptx-ll. I mean the compact design is more expensive than normal one.
BTW, just sent PCB order to the supplier, so next 4-5 days will be ready BT Stream option
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Old 26th March 2018, 03:08 PM   #13
doctormord is offline doctormord  Germany
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Quote:
Originally Posted by IVX View Post
BOM is not really cheap yet, let's count together:
CM6631A for $5.5(really too expensive for 8051 junk with external flash!), and $3.5 for TAS5558(it is quite ok if 8ch involved but for only stereo, it's expensive too), TAS5624 $.78, CC2540 $.9, stm8s003f3 $.17, SMPS mosfets $.8 for a pair, irs2101s $.3, 4 coils Sagami 7g14c $1.6 for all, LLC and trafo maybe $1.2, aluminum caps $2 for all, PCB 2layers 2oz $1, +$1.5 for all others I guess. Total: about $20 for PCBA.
At which supplier do you order all those for that cheap?

Btw. 7G14C are discontinued.
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Old 26th March 2018, 03:26 PM   #14
IVX is offline IVX  Ukraine
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This is Taobao's prices, cm6635a 35RMB, TAS5624 5RMB etc. And I guess I know why Sagami stopped 7G14C, take a look closely at my "Sagami" on the picture, it is cloned "MIDEN" coils from Hangzhou Usually, I ordering custom flat/strip wire coils from SHZ Senija, or from Foshan, depends on a customer. Sometimes custom coils look unusual and futuristic
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Old 31st March 2018, 11:33 AM   #15
IVX is offline IVX  Ukraine
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BT stream is ready
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Old 1st April 2018, 01:33 PM   #16
IVX is offline IVX  Ukraine
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It seems BT A2DP streaming nearly always 44.1/16. I didn't found on my iPhone and Android way to switch Fs to 48kHz, which is supported along with 44.1kHz in IOS. So the only practically needed is 44.1/16, am I right?
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Old 1st April 2018, 01:59 PM   #17
irs20957 is offline irs20957  Russian Federation
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What sound at low volume levels?
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Old 1st April 2018, 02:05 PM   #18
IVX is offline IVX  Ukraine
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?
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Old 1st April 2018, 02:10 PM   #19
irs20957 is offline irs20957  Russian Federation
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Loss of resolution in low level signal?

I do not speak English well, sorry.

Last edited by irs20957; 1st April 2018 at 02:13 PM.
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Old 1st April 2018, 02:44 PM   #20
IVX is offline IVX  Ukraine
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well, it is 16bit but nothing special I think. However iPhone's A2DP stream sound worse VS USB 44.1/16, probably isn't so steady sound and isn't neutral as well. Maybe I've to check EQ settings in the iPhone's setup, I believe they affect the streamed audio. The original idea was an ultra-compact Hi-Fi "true-digital" amp with high-resolution USB input, and BT LE DSP control by iPhone/Android. So BT streaming just an auxiliary feature. USB 24/96 sounds quite wonderful, and 100.0% pop/click noise free, whatever you taking off power plug or off USB, just player stop and starting again when plug USB/Power in. So when you turning amp On, you've no idea about it does or doesn't work until start play music. This fact is pretty impressive to me.
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