Search found 2858 matches

by haklesup
Fri Aug 14, 2020 11:59 am
Forum: General Discussion
Topic: Skycool
Replies: 10
Views: 2654

Re: Skycool

its a dr Seuss story about a place where a guy sells air, no trees either (that's the central plot BTW)

Opening theme song:
https://www.youtube.com/watch?v=92lO2Bum7v4
jump to 1:00 and 1:50 minute mark for my reference
by haklesup
Thu Aug 13, 2020 10:04 am
Forum: General Discussion
Topic: Skycool
Replies: 10
Views: 2654

Re: Skycool

thinking the vacuum of space can draw air up a tube totally ignores the mass of the air in the tube wanting to stay closer to earth. It would be like expecting a hand dug open well to gush water like an artesian well. "Give it time,,, they'll find a way to charge us for the air we breath now... And ...
by haklesup
Tue Jul 28, 2020 11:53 am
Forum: General Discussion
Topic: Paralleling circuit breakers
Replies: 13
Views: 529

Re: Paralleling circuit breakers

Sounds good, Fuses anywhere a hardware failure could cause high current. Breakers anywhere the load could overburden the source system, that's technically not a failure, more of an application problem. That addresses overcurrent, you should also monitor battery temperature if you want to maximize li...
by haklesup
Mon Jul 27, 2020 2:05 pm
Forum: General Discussion
Topic: Paralleling circuit breakers
Replies: 13
Views: 529

Re: Paralleling circuit breakers

its always better to use one protection device, they aren't resistors and one should not design like they are in a resistive network. Breakers cannot be used in parallel unless the datasheet for it indicates that it is allowed. Placing them in series is no better than having only one. As you indicat...
by haklesup
Tue Jul 21, 2020 10:32 am
Forum: General Discussion
Topic: The Eternal $19.00 Radio
Replies: 13
Views: 609

Re: The Eternal $19.00 Radio

were you sure they were not 4 layer boards (most were 2 layer but can't rule it out). Dummy transistors would still have raised their costs
by haklesup
Tue Jul 21, 2020 10:27 am
Forum: General Discussion
Topic: Linear power supply problems
Replies: 10
Views: 388

Re: Linear power supply problems

I agree the OEM transformer should do its original job but it could have shorted secondary windings which would change its output characteristics. A failure of the full wave bridge such that it acted more like a half wave would allow it to seem to work but at reduced power and greater noise. But loo...
by haklesup
Tue Jul 21, 2020 10:17 am
Forum: General Discussion
Topic: 4V phone charger
Replies: 5
Views: 198

Re: 4V phone charger

you'll drive yourself crazy if the only thing you are observing is how long it takes to charge, you need to start measuring charge voltage and current directly to learn more about the relationship in the context of your phone and what critical cutoff points are if you try to make the voltage variabl...
by haklesup
Thu Jul 16, 2020 1:37 pm
Forum: General Discussion
Topic: searchine for 2mm JST 5P male connectors
Replies: 16
Views: 747

Re: searchine for 2mm JST 5P male connectors

I think you're going to have to attach your own wires to the header component, then you can insulate with heat shrink or hot glue
by haklesup
Thu Jul 16, 2020 1:34 pm
Forum: General Discussion
Topic: Sole Treadmill Repair
Replies: 8
Views: 338

Re: Sole Treadmill Repair

ohming out the motor coils will help you understand if there is an open coil or shorted coil. In which case, its probably not worth fixing. Its probably a stepper motor, which are good for maintaining high torque during variable speed settings.
by haklesup
Thu Jul 16, 2020 1:30 pm
Forum: General Discussion
Topic: Linear power supply problems
Replies: 10
Views: 388

Re: Linear power supply problems

the chip should be very low cost and the passives should be able to check with a DMM. Maybe just replace the chip rather than try to prove its bad first might be quicker to eliminate that possibility. I doubt its the transistors but maybe. Draw a graph of load current vs output voltage, it may not s...
by haklesup
Thu Jul 16, 2020 1:23 pm
Forum: General Discussion
Topic: 4V phone charger
Replies: 5
Views: 198

Re: 4V phone charger

using the charger that came with the phone is the best way to get the most life out of the battery (its the only one you can count on as being engineered to work best), also keeping it cool as much as you can helps. Your old phone, I don't know about but battery management and battery technology in ...
by haklesup
Tue Jul 14, 2020 4:15 pm
Forum: General Discussion
Topic: Linear power supply problems
Replies: 10
Views: 388

Re: Linear power supply problems

I wouldn't expect much heat until It is operated at max load for a little while. The VCE at full load of the transistors x the current in each will determine how many watts each transistor must shed. If the heatsink is more than needed, it will not seem to get very warm. regardless, the transformer ...
by haklesup
Tue Jul 14, 2020 4:09 pm
Forum: General Discussion
Topic: searchine for 2mm JST 5P male connectors
Replies: 16
Views: 747

Re: searchine for 2mm JST 5P male connectors

Female connectors are normally used for source connections while male pins are for the load, this helps prevent accidental short circuit if the source by enclosing the pin in the connector body. If pigtails are mainly used on the battery, it makes sense most would be F, while M connectors are more t...
by haklesup
Tue Jul 14, 2020 4:03 pm
Forum: General Discussion
Topic: Laser Madness
Replies: 10
Views: 1686

Re: Laser Madness

That is old, Makes me wonder if a laser blaster is protected by the 2nd amendment (LOL)
by haklesup
Tue Jul 14, 2020 4:01 pm
Forum: General Discussion
Topic: High Power Ultrasonics
Replies: 15
Views: 704

Re: High Power Ultrasonics

Dry ice, sure that should work and better for the air too