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Old 12th April 2013, 02:07 PM   #11
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double or triple check correct position of your parts at PCB

doing this a liitle bit careless costs me a matched pair of 2sk170 at input of a SYMASYM. At my pass clones all goes easy till now
may be i take more care at pass
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Old 12th April 2013, 02:09 PM   #12
tool49 is offline tool49  Canada
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I'd go one step further ask someone else to double check your placement before powering the project. A fresh eye will often see something that you will miss (even multiple times!)
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Old 12th April 2013, 02:12 PM   #13
Zen Mod is offline Zen Mod  Serbia
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mistakes

I made them all

learned nuttin'

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Old 12th April 2013, 02:34 PM   #14
Pemo is offline Pemo  Mexico
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Twisted pairs.
Power Ground
Audio Ground.
Is that right Andrew?
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Old 12th April 2013, 05:25 PM   #15
Mr. dB is offline Mr. dB  United States
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Quote:
Originally Posted by Pemo View Post
Twisted pairs.
Power Ground
Audio Ground.
Is that right Andrew?
Or dirty ground and clean ground, to keep rectifier noise out of the audio ground.

Which one do you connect to the speaker ground? I've seen both...
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Old 12th April 2013, 06:06 PM   #16
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Measure all resistors with multi-meter before soldering to PCB.
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Old 12th April 2013, 08:49 PM   #17
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Before switching on for the first time, check for open circuit between heat sink and middle (source) pin on output transistors to ensure that thermal pads are in fact electrically insulating.
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Old 13th April 2013, 04:00 PM   #18
Rixsta is offline Rixsta  United Kingdom
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Quote:
Originally Posted by Andersonix View Post
Before switching on for the first time, check for open circuit between heat sink and middle (source) pin on output transistors to ensure that thermal pads are in fact electrically insulating.
Thanks, yes this is one of them Iv'e not forgotten, mostly that im scared of blowing a Mosfet when it can fry them all like dominoes and cost you a bit.

Will read what you all put when I have time, Cheers i needed to see some of this stuff myself!
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Old 13th April 2013, 04:45 PM   #19
Floric is offline Floric  Europe
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- Before applying voltage for the first time, check for short circuits with your Ohmmeter.

- Never apply voltage to a pcb without spacers to the desk.

Not that I already did it...
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Old 13th April 2013, 11:57 PM   #20
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1. Read the pin out on the datasheet (IE 7812 and 7912 voltage regs have different pin outs) my first project and first error!

2. make sure you connect the proper ground to the circuit in a dual mono amp (when I cased up my dual mono Mini A, DUH!)

3. be VERY CAREFUL with Caps, Goggles are your friend...be Careful if you did not buy them BRAND spanking new. Build yourself a isolation area to apply voltage to them slow.

4. Dont pull an "all-nighter" and then try to power up your build, walk away comeback after lunch and double check the basics first!

5. Get a Variac, Bulb Tester, Fuse board, and make a test rig.
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