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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Oh sorry I must have missed that somehow. I must have read over it too fast.
So if it was pulsed at 50 percent duty cycle, each LED should be as bright as 1/2 of it's total brightness with those resistor values. If the brightness does not look equal (if you needed that) then change the duty...
Someone tell him he might also be able to pulse the microcontroller pin. Using 50 percent duty cycle or whatever is needed to get the desired brightness on both the red and the green.
Pulsing at 50 percent probably will not make them both the same brightness because the efficacy of each LED...
Hi,
You could try using some of that cloth electrical tape to cover the case end when soldering. That might help. The cloth type would be better than the vinyl type. I ran into this a couple times too with various types of cells. If the solder bridges over or if the soldering tip bridges the...
Hi,
There are different types of NiCd chargers and none of them would work with Li-ion. I'll explain the NiCd ones first.
The first type is the current limited NiCd charger. It uses a transformer and current limit resistor. It is crude, but it works. This could not be used with Li-ion...
Hi,
I can only guess but if the detectors are a little older and dust gets into them, that could be causing the problem. It's interesting though that 5 detectors are doing the same thing. If there is nothing else common but the air in the room(s), then something may be in the air or else they...
Hi,
What caused the failure? That could tell us where to look.
You would probably have to know what each pin of the controller IC was used for, but if you can narrow it down to just the pin that turns the power elements on maybe you could check that.
Well then it would come under a general repair procedure. That would mean checking the power supplies first, then signals, then power components, then the transformer. To test a transformer, you have to run it up and measure current and voltage.
A trick that is often used for troubleshooting...
Hello again,
Oh then if you can't get it off the board then there is no chance of fixing it, unless it is just a solder joint or something simple like that.
I will say though that it would be rare for the transformer to go bad unless the design was faulty from the beginning. I worked in this...
Oh wow. Well then it depends where the short is inside the windings.
Sometimes the short is near the outside because something physical may have struct the outside, but if it is deep inside then all the later windings have to be removed and the short repaired, or possibly rewind the whole...
Hi,
Yeah people quickly forget there is a massive surge when an incandescent light bulb is first switched on. The cold resistance can be as low as 1/10th of the hot resistance, and it's too late to sue Edison :)
Hi,
Human eyesight issues are very complex.
The eye itself is complex involving the iris that helps to adjust the amount of light reaching the retina. That means that if the light it gets is constantly changing, it will interpret that as constantly changing in about the same way, but if there...
Hi,
Are you sure the 'new' battery is really new and not sitting around for years before use?
They usually last a long time on the shelf though.
Is it the right type of battery, like Alkaline instead of Carbon Zinc?
Carbon Zinc batteries basically suk when it comes to higher current demains...
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