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Post by Chris on May 17, 2015 7:54:39 GMT
Yeah,came as a kit that I've soldered. Found the chip tricky as the space between the individual pins is so small.  |
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Post by Chris on May 17, 2015 7:56:34 GMT
I'm scared to post a pic of my soldering.
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Post by Greg on May 17, 2015 12:12:07 GMT
Have you checked the polarity of the electrolytic caps and the diodes?
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Post by Chris on May 17, 2015 13:34:49 GMT
Got a bit confused with the pics but will do that later.
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Post by MartinT on May 17, 2015 17:44:44 GMT
Ok, the Netgear PSU is 12V with the positive pin the centre one. 1A current ability should be fine to get it going.
You really need a meter in order to test that you have 12V getting through to the PCB.
The electrolytic looks to be the right way round in the photo, but I cannot see the diode and LED markings to check their orientation.
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Post by MartinT on May 17, 2015 17:46:04 GMT
STOP PRESS!
It looks like the diode and resistor have been swapped around (D2 & R3).
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Post by Eduardo Wobblechops on May 17, 2015 19:07:35 GMT
Well spotted.
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Post by Chris on May 17, 2015 22:09:27 GMT
Conflicting bloody pics on eBay. Will look again and try and sort it.
Tried it one way,didn't work,so moved them. Still didn't work. Damn.
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Post by Greg on May 17, 2015 22:27:44 GMT
Chris, clearly as Martin pointed out you built with R3 and D2 in the incorrect position. Correction may not resolve the problem because you may have buggered some components owing to your mistake. Furthermore, you need to be sure of polarity on the diodes and capacitors. Do you have an instruction guide? If so, please publish it here as it will help us to help you further.
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Post by Chris on May 18, 2015 5:35:49 GMT
No instruction guide Greg. I followed the pics on EBay but they confused me.
If it's forked its forked - it was an interesting wee thing to try and I HAVE learned a wee bit from my mistakes. Can see myself just buying another one and starting again but I'm offshore again shortly so it'll be after that. Can see myself buying a multimeter as well.
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Post by MartinT on May 18, 2015 5:46:23 GMT
There's another problem, Chris: the IC amp isn't flush against the heatsink meaning that it will overheat and shutdown the moment you try and use it in real life for driving speakers. You need a little heatsink compound (or, at a push, Vaseline) between the module and the heatsink and tighten it up.
Provided the IC isn't borked (only likely if you reverse the 12V DC, although that diode may be in circuit to protect from it), the amp should be rescue-able. If you give up in despair you can post it to me (or one of the Scottish clan) to take a look at. Meanwhile, can you post the link to the eBay item so that we can try and find the circuit diagram?
EDIT: sorry, found it. |
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Post by MartinT on May 18, 2015 5:51:07 GMT
This helps. Note the direction of D2: when you swap R3 and D2 around, make sure you reverse the direction of D2 when you put it in place. Stripe to stripe. Also, check the direction of the LED: there should be a flat in the body which matches the line drawn on the circuit board. |
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Post by Chris on May 18, 2015 7:20:09 GMT
Cheers Martin! Appreciate the offer but I will plod on with this. I'm finding learning about my mistakes interesting.
Bloody trying but interesting!
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Post by Eduardo Wobblechops on May 18, 2015 9:56:34 GMT
I'm not far away if you need a hand Chris.
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Post by Chris on May 18, 2015 11:47:14 GMT
Thank you!
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Post by Greg on May 19, 2015 21:33:40 GMT
No instruction guide Greg. I followed the pics on EBay but they confused me. If it's forked its forked - it was an interesting wee thing to try and I HAVE learned a wee bit from my mistakes. Can see myself just buying another one and starting again but I'm offshore again shortly so it'll be after that. Can see myself buying a multimeter as well. Hi Chris, Just a thought. If you give up on this kit option, search eBay further because similar modules are available at a similar price all fully constructed. All you need to do is work out the hook up wiring and the board has screw terminals to accommodate that. Easy to do. Greg |
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Post by Chris on May 20, 2015 4:58:14 GMT
Cheers Greg - the main reason with this was just to push myself a wee bit so I didn't really ever expect it to work. I have learned a wee bit though and will go back to it whenever I get 5 minutes. I wanted a bit of soldering practice as well!
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Post by spendorman on Aug 30, 2015 16:58:05 GMT
I bought a similar amp on ebay, but fully built, was les than £2.00, works really well. Fed it in to a pair of Rogers BBC LS3/6's, very good sound. Best with above 12V for these speakers as they are not very efficient.
I did buy another of the same amps, seems dead, not investigated it further. Bought a further one, and that is OK.
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Deleted
Deleted Member
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Post by Deleted on Aug 30, 2015 17:30:20 GMT
Hows it going Spendorman, i see the pussy still taking life easy?
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Post by spendorman on Aug 30, 2015 17:44:52 GMT
Thanks for asking, not so good, she unexpectedly died 3 weeks ago. Very upset
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