Search found 2072 matches

by jwax
Mon Nov 21, 2016 1:55 pm
Forum: General Discussion
Topic: A grounding 'feel good'
Replies: 5
Views: 1329

Re: A grounding 'feel good'

Have you tested it? Maybe the plastic is conductive! :razz:
by jwax
Mon Nov 21, 2016 12:09 pm
Forum: General Discussion
Topic: A grounding 'feel good'
Replies: 5
Views: 1329

Re: A grounding 'feel good'

No doubt made in a country where looks trumps function. :(
by jwax
Sun Nov 06, 2016 5:56 am
Forum: General Discussion
Topic: 12VDC FROM 120 VAC (Solved)
Replies: 12
Views: 2254

Re: 12VDC FROM 120 VAC DILEMMA

Probably saw some of these transformerless AC-to-DC circuits:
http://www.brighthubengineering.com/diy ... ly/#imgn_2
by jwax
Thu Oct 06, 2016 1:00 pm
Forum: General Discussion
Topic: Need a Schematic for: NEWCOMB Model: B-100A AM Radio
Replies: 13
Views: 2789

Re: Need a Schematic for: NEWCOMB Model: B-100A AM Radio

I'd go for the fix with this: http://www.ebay.com/itm/OT8SE-Single-Ended-Output-Transformer-8VA-5K-7Kohm-3-2-8-16-45mA-imported/161821388842?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D39242%26meid%3D2db3fe53228d474aa2bb1d1ff8a64d2b%26pid%3D100005%26rk%3D5...
by jwax
Thu Oct 06, 2016 6:59 am
Forum: General Discussion
Topic: Need a Schematic for: NEWCOMB Model: B-100A AM Radio
Replies: 13
Views: 2789

Re: Need a Schematic for: NEWCOMB Model: B-100A AM Radio

If that is a 6V6 audio output tube, a 5,000:3.2 ohm output transformer will be fine.
Break out a drill to remove the spot welds, and insert screws/nuts to mount the new transformer.
by jwax
Tue Sep 27, 2016 9:50 am
Forum: General Discussion
Topic: Battery powered mower issue Solaris Brand.
Replies: 2
Views: 1020

Re: Battery powered mower issue Solaris Brand.

Monitor the drive to the motor, and see if the drive signal is varying?
by jwax
Fri Sep 23, 2016 6:37 pm
Forum: General Discussion
Topic: Grid-Tied AC microinverter
Replies: 4
Views: 1253

Re: Grid-Tied AC microinverter

Yes, definitely an off-grid situation. If you're wondering why not use an off-the-shelf Walmart or Harbor Freight inverter, the solar panels I have output 30-40 volts DC, and those inverters do not handle those voltages. A microinverter, however, is made for that input range. Good ideas folks, and w...
by jwax
Fri Sep 23, 2016 6:30 pm
Forum: General Discussion
Topic: A Slightly Uncommon Monitor Cleaning Problem
Replies: 7
Views: 1584

Re: A Slightly Uncommon Monitor Cleaning Problem

I'd be very cautious with any acetone anywhere near a plastic screen.
Never tried it in light doses, but unless you have the likes of lard or vaseline on the screen, avoid acetone.
by jwax
Fri Sep 23, 2016 11:09 am
Forum: General Discussion
Topic: Grid-Tied AC microinverter
Replies: 4
Views: 1253

Grid-Tied AC microinverter

These devices have a unique feature- they must first see 120 VAC, 60 Hz on their output, before they switch on and contribute power to that AC line. The purpose is to disable the output of a solar module in the event the grid goes down. If the inverter did not shut down, it would be supplying AC to ...
by jwax
Fri Sep 23, 2016 10:58 am
Forum: General Discussion
Topic: A Slightly Uncommon Monitor Cleaning Problem
Replies: 7
Views: 1584

Re: A Slightly Uncommon Monitor Cleaning Problem

Soap, and a water-damp microfiber cloth.
by jwax
Wed Sep 14, 2016 12:07 pm
Forum: General Discussion
Topic: need help looking for a DC input led power supply (12-24V)
Replies: 12
Views: 2734

Re: need help looking for a DC input led power supply (12-24

Why not build yourself a rechargeable Li-Ion battery pack? Size it to whatever your voltage/current needs may be.
18650 size Li-Ion cells are all over ebay for cheap.
by jwax
Thu Aug 11, 2016 10:13 am
Forum: General Discussion
Topic: Copper Theft
Replies: 7
Views: 1529

Re: Copper Theft

It does make perfect sense, especially for overhead lines, aluminum being lighter. Maybe Alcoa/Reynolds don't have the same political power with the utilities that the existing copper suppliers have.
by jwax
Tue Aug 02, 2016 9:55 am
Forum: General Discussion
Topic: Lithium-ion Charging
Replies: 5
Views: 1211

Re: Lithium-ion Charging

Thanks all! Treating my paralleled 3 cells as one seems the way to go. I have one of these coming: http://www.ebay.com/itm/151998973264?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT It also allows one to measure the actual capacity of cells, in Amp Hrs. The popular 18650 Li-ion can be h...
by jwax
Sun Jul 31, 2016 1:40 pm
Forum: General Discussion
Topic: Lithium-ion Charging
Replies: 5
Views: 1211

Lithium-ion Charging

Tired of replacing gel cells in a few 12 VDC projects, so switching to Li-ion. 3 cells (18650- 4 AH) in parallel, and 4 of those banks in series gives the desired 14+ volts. What is the best way to charge this pack? Have heard each cell needs to be monitored and charged individually, but if I have 3...