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12v switching regulator singing

PostPosted: Tue Oct 19, 2010 3:16 am
by f6bir
Hello all,
Since time one of my switching 12v regulator or associate choke singes depending if I put the RF power or not
I don't watch anything on the scope and all is working well
Is anyone now why
73'

Rene F6BIR
http://idata.over-blog.com/3/89/05/80/alim-driver.jpg
http://img.over-blog.com/300x189/3/89/0 ... driver.jpg
http://img.over-blog.com/300x127/3/89/0 ... driver.jpg

Re: 12v switching regulator singing

PostPosted: Tue Oct 19, 2010 6:38 am
by kf1z
Do you mean you HEAR the regulator making noise? A mechanical singing...?

Or do you see something on a scope?


I think if all is working well, maybe some glue in the appropriate place........

Re: 12v switching regulator singing

PostPosted: Tue Oct 19, 2010 7:27 am
by f6bir
Yes I hear song from regulator or 150┬ÁH choke like a water escape ! but only sometime and sound level is variable
nothing I saw on the scope
Thanks