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Chip Amps Amplifiers based on integrated circuits

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Old 10th November 2017, 05:34 AM   #1161
twocents is offline twocents  South Africa
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What the heck?  It's less than lunch!
Quote:
Originally Posted by jwicaksana View Post
there's a website that has an automatic calculator for this, and it works really nice. Just sharing in case you have a bad room like mine, near field can be the way to go.
Interesting, thanks Jonathan. Could you PM me a link to the website please?

Very OT, but bonjonno's post made me wonder about speaker placement and imaging. When there are stuff like TV cabinets or other furniture between (and close to) stereo speakers - does that have a negative effect on the soundstage and imaging?
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Old 10th November 2017, 05:56 AM   #1162
jwicaksana is offline jwicaksana  Indonesia
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Speaker Placement Calculator

This is the website. I used the realtrap 38% option.
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Cheers,
Jonathan
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Old 10th November 2017, 09:13 PM   #1163
zek is offline zek
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Better use this
Cardas Room Setup Guide
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Old 20th January 2018, 06:22 AM   #1164
Dunk02 is offline Dunk02  Australia
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Just thought I would share my TDA7297 build. Just a bit of fun. Not an audiophile.

I bought an assembled PCB on line and used timber scraps and few common electrical parts for the case.

I performed the recommended capacitor additions and upgrades, changed the volume pot, and put it in a minimalist enclosure.

At the back is a speaker terminal block, power switch and power jack (5.5x2.5). On the front panel I have added the power LED and 3.5mm input jack, as well as the volume pot (not sure I like the black).

Inside I changed the LED to a low intensity 5mm green without changing the onboard current limiting resistor. Vent holes top and bottom neat the heat sink.

Currently running off a small 7.5AH VRLA 12 battery.

Into a pair of Warfdale 415 100w 8ohm 87dB bookeshelf speakers the amp draws max 1.87A at 12.5V that is 23.4 Watts peak consumption measured at he battery. Inrush current is 17.5A. I had the iPhone at max volume playing Brothers In Arms.

Reasonably loud in a small room.

Any suggestions for a nicer volume dial? Once have decided on one I will trim the pot to length.

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Old 20th January 2018, 07:35 PM   #1165
Dunk02 is offline Dunk02  Australia
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I’d maybe like to make a pair of speakers and a regulated linear power supply to go with this.
Does anyone have any suggestions (off the shelf, kits, specs, etc) on either?
Thanks

Last edited by Dunk02; 20th January 2018 at 08:04 PM.
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Old 22nd January 2018, 09:30 PM   #1166
stellarelephant is offline stellarelephant  United States
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Quote:
Originally Posted by Dunk02 View Post
I’d maybe like to make a pair of speakers and a regulated linear power supply to go with this.
Does anyone have any suggestions (off the shelf, kits, specs, etc) on either?
Thanks
Cool build. If you want to continue with the theme of mighty sound in a small package, you might look into speaker designs built around the Aura NS3 or Dayton's versions of the same driver, ND90. They perform unbelievably well for their size, especially as near field monitors. A couple popular full range projects are the Carmody Sprite (which I built) and Wolf PC speakers. A popular build adding a tweeter is the Helium. There is another one out there using a planar tweeter even, which I hope to try. Check the PE forums for lots of examples.
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Old 23rd January 2018, 08:26 AM   #1167
Dunk02 is offline Dunk02  Australia
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Thanks for the suggestions. The Heliums look like a nice speaker but The components will be easily purchased from Australia.
How do these diy speakers compare to the Dayton BR452?
Or the Overnight Sensations kit?

Last edited by Dunk02; 23rd January 2018 at 08:48 AM.
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Old 23rd January 2018, 06:31 PM   #1168
Dunk02 is offline Dunk02  Australia
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Meant to say “not readily available”
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Old 25th January 2018, 02:34 AM   #1169
stellarelephant is offline stellarelephant  United States
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Sorry, I didn't consider your location. I think the driver I mentioned would blow the doors off of B452 or pretty much any other cheap drivers under 6.5". They have crazy excursion. AFAIK the OS plays in a higher class. It uses pretty nice drivers, packs unusual bass for its size, and its sound is definitely well loved by many.
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Old 25th January 2018, 04:22 AM   #1170
Dunk02 is offline Dunk02  Australia
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Thanks, much appreciated advice. The OS speakers are much larger than the ones you suggested. I think I will go back to investigating those in your post.

Last edited by Dunk02; 25th January 2018 at 04:30 AM.
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