Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Solid State => Topic started by: tubesornothing on April 16, 2010, 08:20:44 pm

Title: Keep frying regulators
Post by: tubesornothing on April 16, 2010, 08:20:44 pm

I have a small LED light circuit in my amp that takes approx 16V DC from a voltage doubler circuit, then runs it thru an LM7812. The LED lights consume about 130mA.  I keep frying regulators.  I am pretty sure its because I am too heavy handed with the solder iron.  OK so I can fix that.

So is there anyway I can easily test the regulator out of circuit before I toss it in the bin? 

Title: Re: Keep frying regulators
Post by: sluckey on April 17, 2010, 07:44:33 am

Quote

So is there anyway I can easily test the regulator out of circuit before I toss it in the bin?

No. 130ma is a LOT of current for a 'small' LED. You do have a series resistor with the LED, right?

Title: Re: Keep frying regulators
Post by: tubesornothing on April 17, 2010, 07:54:37 am

Its a strip of LEDs http://ca.mouser.com/ProductDetail/Optek/OVQ12S30WW7/?qs=agb4oTp1Mj%2fOz2iBqNdyew%3d%3d (http://ca.mouser.com/ProductDetail/Optek/OVQ12S30WW7/?qs=agb4oTp1Mj%2fOz2iBqNdyew%3d%3d)

After a further look I see that I had the circuit board miss wired (argghh).  Hopefully I did not fry - and yet another reg!