station240
Member
- Joined
- Oct 9, 2016
- Messages
- 177
List of various electronics to be wary of, usually sourced from china directly.
This is for stuff that is of poor design or quality, some of which is what I term Class 0 electronics (explanation later).
Cheap or sometimes not quite so cheap DC to DC converters.
These can vary from works well, to poor efficiency, to cannot ever meet the claimed power output.
Be ware some don't have proper (or any!) overload protection. Some claim have short circuit protection, but unless it's a dead short it doesn't trigger.
Also check capacitor voltages, and that they are not lower than what the input/output they are connected to claims to have.
Finally voltage adjustments can exceed what the device can handle.
18650's
Some new cells are actually recycled ones, or tiny e-cig cells with 'packing' material.
Faked cells are filled with sand, which means no risk of fire lol
BMS modules
Useless, give you a false sense of safety.
Better off with a cell monitor, or hunting down a real BMS.
Nickel strip
Laptop packs are constructed by linking 18650 cells together with nickel strip for high conductivity.
There exists Nickel Strip which is actually nickel plated steel. Beware of cheap nickel strip, which often states it is nickel plated.
Cheap 18650 tab welder
Can be one of these Class 0 products, that is dead on arrival.
There is one in the $200 range which has a common fault of a short circuit in the transformer, not hard to fix however.
LED lamps
Some styles of LED lamps are of very poor quality, in both complete light and module form.
An example is the LED floodlight which has a square array of LEDs in a sort of yellow block.
Main issue with these is the 100W comes with a 50W driver, but if you upgrade to 100W, it doesn't last very well. Poorly matched LEDs, so not suitable for dimable lighting.
feel free to add you own
This is for stuff that is of poor design or quality, some of which is what I term Class 0 electronics (explanation later).
Cheap or sometimes not quite so cheap DC to DC converters.
These can vary from works well, to poor efficiency, to cannot ever meet the claimed power output.
Be ware some don't have proper (or any!) overload protection. Some claim have short circuit protection, but unless it's a dead short it doesn't trigger.
Also check capacitor voltages, and that they are not lower than what the input/output they are connected to claims to have.
Finally voltage adjustments can exceed what the device can handle.
18650's
Some new cells are actually recycled ones, or tiny e-cig cells with 'packing' material.
Faked cells are filled with sand, which means no risk of fire lol
BMS modules
Useless, give you a false sense of safety.
Better off with a cell monitor, or hunting down a real BMS.
Nickel strip
Laptop packs are constructed by linking 18650 cells together with nickel strip for high conductivity.
There exists Nickel Strip which is actually nickel plated steel. Beware of cheap nickel strip, which often states it is nickel plated.
Cheap 18650 tab welder
Can be one of these Class 0 products, that is dead on arrival.
There is one in the $200 range which has a common fault of a short circuit in the transformer, not hard to fix however.
LED lamps
Some styles of LED lamps are of very poor quality, in both complete light and module form.
An example is the LED floodlight which has a square array of LEDs in a sort of yellow block.
Main issue with these is the 100W comes with a 50W driver, but if you upgrade to 100W, it doesn't last very well. Poorly matched LEDs, so not suitable for dimable lighting.
feel free to add you own