Be careful. When I worked for a Motorola service center, I saw these
explode when techs put them in backwards. (Do not lean over the radio
and hit the power switch.) I just checked my stash and all the tantalum
capacitors I have show a + sign on one lead. A magnifying glass helps.
Joe Hutchens ( AJ8MH )
http://webpages.charter.net/aj8mh-radio/
On Mon, Jun 27, 2011 at 11:40 AM, Steve Berg wrote:
I have been gradually working my way through my first Argonaut II. I
have had troubles with the inverter circuit that drives the display
back light. I replaced the two electrolytics in that circuit with
tantalums of the same ratings, and while it works, the one 30 MFD
power line bypass cap runs hot, and the display back light is dim.
Since I have the topside switch board out to replace the back light
switch, I want to replace the electrolytics on that board, too. It
has been some years since I had the chance to work with tantalum
capacitors, and I recall that the lead by the heavy black line on the
package is the negative lead. That is how I installed them in the
inverter circuit. Yet the one cap runs hot, the other one does not.
Do I have a bad capacitor, or is there some other problem here that I
am not aware of? I figured that tantalums would be much better
capacitors than electrolytics, which is why I have been trying them.
Am I missing something here? Can someone give me some pointers?
Thanks!
Steve WA9JML
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