Can I replace electrolytic caps with tantalum?

I'm thinking of replacing some electrolytic caps with smaller ones to save space. Foresee any problems? I was thinking tantalum just because they looked like they might be smaller. This is for a AAA 1.2-1.5V circuit.

Posted by royalestel 11 years ago

Polarity of tantalum capacitors

Howdy all, Recently got back into basic electronics and have started building kits. Been building a kit that uses tantalum capacitors and it notes that polarity orientation is very important. The question I have is: is there some un-published indicator of how polarity is indicated on these tantalum caps? I've been over these things with a microscope, even bought new ones, but other than the values & manufacturer, I can find no obvious sign of polarity. Leads are the same length and not marked. What am I missing? Thanks in advance for any help. Dave

Posted by gutbucket 6 years ago

Need Help Identifying Part

Guess what I acquired :) It sings and vacuums and is a robot :P Roomba! It's a first gen (I think), but it was cheaper than a new battery - and it came with a new (in box) battery :PThe problem came when I went to charge it. At first I thought it was fully charged - and the battery acted like it was (1 hour+ of runtime on carpet). But now, it won't charge.Skip ahead some time.I've narrowed it down to this component (see image). When I spray it with canned air liquid - the charger comes back to life. Not to mention, it looks scorched.I'm fairly certain it's a tantalum capacitor. Except, the PCB marks it as "F1" while other tantcaps are "C#" designated. Can anyone confirm/identify?Oh -- it's currently charging with the charge cct in the refrigerator. I'm using a Kill-o-watt to see if it overheats (current drops off) :P I'll be modifying the case with a cooling fan once I've replaced the component :)I've got to say though -- it's really fun to watch is honestly pretty effective and getting stuff out of our "clean" floor :P

Posted by trebuchet03 11 years ago

12v to 6v voltage regulator at about 15 amps

Hi, i have a 1963 VW bug that is very stock, but the 6v lights just dont work very well (dim at idle, then not too bright at speed) it is very simple to use a later 12v generator and then swap out all the lights, battery, coil and relays and it works great. BUT i have a 6v wiper motor and also a 6v gasoline heater that i will need to keep at 6v (the 12v parts are just not available or too expensive) I have found an article that recommends building a cheap voltage regulator using a 7806, ( 6 volt, 1 amp regulator) and 2 1uF 35v tantalum capacitors, then a NPN transistor which the original poster says is a 2N5881 npn transistor. here is the scematic. the pdf article is attached and the link to the original article is here  The questions i have 1. what is a 2n5881 been replaced as? i cannot find it at jameco and the original posted doesn't give any specs for it. 2. how would i "pump up" the amps available from 10 to anything else (looking for about 15 amps) thinking that the npn transistor is the key but i am new to this and wouldn't even begin to know where to look. 3. what happens if any item fails? can i put some sort of safety into this so it quits rather than passing any addition voltage through additional info the heater runs at about 85 watts so 85 watts / 6volts = 14.616 amps  the wipers run at much less than that so building 2 of this would work great.  Any ideas? Thanks in advance for any insight to this 

Posted by starvin 6 years ago