Spacehead
100+ Head-Fier
- Joined
- Jan 1, 2010
- Posts
- 423
- Likes
- 16
Here are better pics:
http://dl.dropbox.com/u/7337908/IMG_6844.JPG
http://dl.dropbox.com/u/7337908/IMG_6845.JPG
It burned the led when there was only one, in LED1
In scratchpad I have diode bridge and LM317T configured to 24V. The wall wart outputs 26VAC.
I added 0.1uF caps to BUFG pins because all the buffers ran hot at one point. I need to measure the current draw...
I will get back to it...
There can be scratches.
I need to get some clean isopropyl alcohol soon.
Quote:
http://dl.dropbox.com/u/7337908/IMG_6844.JPG
http://dl.dropbox.com/u/7337908/IMG_6845.JPG
It burned the led when there was only one, in LED1
In scratchpad I have diode bridge and LM317T configured to 24V. The wall wart outputs 26VAC.
I added 0.1uF caps to BUFG pins because all the buffers ran hot at one point. I need to measure the current draw...
I will get back to it...
There can be scratches.
I need to get some clean isopropyl alcohol soon.
Quote:
May we see a top-side pic showing D1 and D2?
Clearly so. As messy as it's left your board, I wonder if you wouldn't have been better off not cleaning it at all as use that stuff. Instead of flux around the solder points, you have junk evenly spread over the board now.
I think you have little choice but to make another cleaning pass at it. Try to find something purer: tape head cleaner, high-purity isopropyl from a drug store, etc.
Heet gas additives are high-purity alcohol (yellow bottle = methanol, red = isopropyl), but I don't know how the 1% of "proprietary additive" affects its suitability as a PCB cleaner.
I also see the potential for several shorts:
- BATT wires, extra exposed length and solder splatter on the blue one
- several places around BUFG
- extra unclipped lead lengths and unshielded jumpers in the scratchpad area
Is that a scratch or wire strand near forward LED?