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Chip Amps Amplifiers based on integrated circuits

Another BPA200 post: Need some advice on finalizing design
Another BPA200 post: Need some advice on finalizing design
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Old 9th February 2018, 12:36 AM   #21
00940 is offline 00940  Belgium
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It looks like the antek transformer would be alright, tying red and orange to make the CT. I guess the footnote is to avoid people unbalacing the transformer by using only one secondary or playing with weird configuration with the primary.

Btw, the antek transformers might come cheaper. The 400VA is 51$, the 800VA is 84$ and the 1000VA is 100$ but you have to order from them.

As a side note, I've stopped etching my own boards. The price and quality of the cheap fab houses in China is just unbeatable, especially for small boards. The only downside is the one month wait time to get the board (even worse now with the Chinese new year).

Edit: the suggestion of using the drv134 is to get a differential signal so that you can use all inverting lm3886 and not half inverting, half non inverting. The lm3886 is slightly better in inverting config.
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Old 9th February 2018, 12:45 AM   #22
sr2002 is offline sr2002  United States
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So, would you suggest using something like ExpressPCB and then ordering through them? Any other software suggestions and places to order PCBs in the US?

Also, any recommendation on the mute circuit strategy that I had mentioned earlier?

I'll check out the Antek transformers, I think they have an ebay store too.
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Old 9th February 2018, 12:52 AM   #23
tomchr is offline tomchr  Canada
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Quote:
Originally Posted by sr2002 View Post
So, would you suggest using something like ExpressPCB and then ordering through them? Any other software suggestions and places to order PCBs in the US?
OSH Park makes good PCBs. I hear good things about KiCAD software but have no personal experience with it. Some swear by Eagle, but last I tried to use it, the UI made me lose my mind. Maybe the company that bought it decided to make it usable. I also seem to recall some quite usable demo versions of OrCAD and Altium being offered by their respective vendors. Both OrCAD and Altium are industry standard, so if you get over the learning curve, you'll have a useful skill that could be applied in the job market should you so desire.

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Also, any recommendation on the mute circuit strategy that I had mentioned earlier?
See Post #12.

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I'll check out the Antek transformers, I think they have an ebay store too.
Why bother with ePay? Just go through their website. The Antek Transformers are incredibly value for the money and John usually ships them within one business day of order placement.

Tom
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Modulus-86: 40W/8Ω @ 0.000061% THD. HP-1: 3W/20Ω, 450mW/300Ω @ 0.000032% THD. DG300B and Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right

Last edited by tomchr; 9th February 2018 at 12:55 AM.
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Old 9th February 2018, 01:00 AM   #24
sr2002 is offline sr2002  United States
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Tom, thanks for the info I'll check OSH out.
For mute I was referring to what I mentioned in post #17 of having individual resistors and capacitors for each IC
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Old 9th February 2018, 01:05 AM   #25
tomchr is offline tomchr  Canada
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You can combine the mute RCs as I mentioned in Post #12 or go with separate mute RCs as you described in Post #17. I'm not seeing any issues with either approach.

Tom
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Modulus-86: 40W/8Ω @ 0.000061% THD. HP-1: 3W/20Ω, 450mW/300Ω @ 0.000032% THD. DG300B and Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 9th February 2018, 01:07 AM   #26
sr2002 is offline sr2002  United States
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I see. I was just checking Antek's website, any reason I shouldnt just go for a prebuild unregulated PS such as the PS-8N35 and then just add my Nichicon 10,000uf x 4 caps + rest of the PS circuit from the AN-1192 doc from the rectifier output.
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Old 9th February 2018, 01:10 AM   #27
sr2002 is offline sr2002  United States
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Nevermind actually, I dont think those are dual supplies
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Old 9th February 2018, 01:22 AM   #28
00940 is offline 00940  Belgium
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Quote:
Originally Posted by sr2002 View Post
So, would you suggest using something like ExpressPCB and then ordering through them? Any other software suggestions and places to order PCBs in the US?
Expresspcb is quite expensive and ties you to a pretty bad piece of software. They're fast and quality is ok on the other hand.

If you want an US factory, OSH park is a good compromise in between speed and cost. Quality is very good too. For small high quality boards in small quantity, it's really worth it.

If you don't mind waiting a bit longer, it's worth considering a Chinese seller, such as smart-prototyping (that's the one I'm usually using). Quality is a bit worse but that's no problem with such simple pcb.

To give you an idea, for 8 pieces of 5.5 inch square pcb (using mine as exemple), OSH Park will cost 82.5$ (for 9 pcs actually). Smart proto will make 10 pieces for less than 20$ shipped.

Software wise, I'm using Eagle myself but it's just because I started with it. I tried Kicad (much more flexible and powerful than Eagle freeware) but couldn't get used to the interface and the libraries management.
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Old 9th February 2018, 03:04 AM   #29
tomchr is offline tomchr  Canada
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Seeed Studio is another el-cheapo Chinese PCB manufacturer. I have no personal experience with them, but many here seem to like them.

If you are going to learn a piece of PCB layout software, learn one that outputs Gerber files. That's the file format used by the PCB manufacturers.

Tom
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Modulus-86: 40W/8Ω @ 0.000061% THD. HP-1: 3W/20Ω, 450mW/300Ω @ 0.000032% THD. DG300B and Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 9th February 2018, 04:57 AM   #30
asuslover is offline asuslover  Romania
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Another BPA200 post: Need some advice on finalizing design
maybe this will help : PA150 - 3x LM3886 PCB assembly guide
neurochrome.com (Tom) has a this THAT Driver instead of drv134.
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