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PC Speaker electronics to amplifier conversion
PC Speaker electronics to amplifier conversion
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Old 20th December 2015, 05:42 PM   #11
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Default PC speaker outside

A picture of the PC speaker enclosure
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Old 21st December 2015, 01:43 AM   #12
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Update: cutting out of the music during playback was due to a fault in the CD player - an old laptop PC used as cd player.
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Old 28th December 2015, 04:52 AM   #13
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Another attempt to locate the soldering points for an external DC 12 volt power supply instead of the AC transformer power was not successful. There is a large capacitor near the set of 4 diodes and I am not sure what is connected to what. Better leave it as it is, and connect two speaker output terminals to the top of the box. Paint the box and then I am done. Next on to the speakers.
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Old 29th December 2015, 04:44 AM   #14
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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This instructable says to connect the battery output (9V in this case) to the AC input of the board. Will this cause any problems? I could possibly go this route with this current powered speaker amplifier project and save a lot of trouble.

Last edited by BasicHIFI1; 29th December 2015 at 04:44 AM. Reason: Added corrections
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Old 1st February 2016, 07:07 AM   #15
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Default Comlpleted PC speaker to amplifier conversion

Connected speaker outs to speaker posts on the case. Works fine. 70 dBA SPL at 1 metre.

How does it sound? Well with my speakers on another thread, I am getting a clear output using only the two 6" woofers used as open baffle.
Already it is better than any of the mini stereo systems on the market.
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Last edited by BasicHIFI1; 1st February 2016 at 07:27 AM. Reason: Added info
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Old 24th March 2016, 11:58 AM   #16
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Apparently DC input can be supplied to the AC input terminals. In this case, the speaker can be run off DC - such as batteries or an adapter.

Power Topics for Power Supply Users: Can I Operate my AC-DC Power Supply with a DC Input?
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Old 24th March 2016, 01:45 PM   #17
OffGridKindaGuy is offline OffGridKindaGuy  United States
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What I usually do is disassemble the unit so I can get a voltage reading at the filter cap. (Unit filleted open and plugged into the A.C. source as in normal operation) That gives me an idea of what D.C voltage I can apply..

If the unit has a full wave diode bridge, (Like the one in your example) D.C. can be applied at the connections of the original transformer with no regard to polarity. The full wave bridge make it impossible to connect the D.C. incorrectly..
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Old 25th March 2016, 04:19 PM   #18
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Thanks, Picture of board in post #6., 4 diodes looks like full wave.
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Old 26th March 2016, 12:59 PM   #19
BasicHIFI1 is offline BasicHIFI1  Sri Lanka
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Update: It works! A 9 volt battery powers the speakers, and it does not matter how it is connected. It also works off 3 volts. Burned out a speaker running this way - could there be a connection? (no pun intended).

All set to transfer the electronics to a sleek amplifier case, one that can be wall - mounted.
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Old 27th March 2016, 01:05 AM   #20
Richard Ellis is offline Richard Ellis  Argentina
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Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
I'd done one with the 2822 making it go.....some 600mW worth....still able to drive my Infinity QB. "Reimagened" ...........

....,...........Rick.......
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