Spencerleehorton
Well-known member
Have got a prototype circuit built but I’m designing a single layer version which will be much smaller.
Going to test, fingers crossed!!!
Going to test, fingers crossed!!!
I have quite often made 2 x 24v regulated psu's from a 2x24va.c transfomer using a seperate half of the trafo and a seperate 7824 for each psu. I then just stack one on top of the other for 48v. It means the 48v is way over specced but it is a simple way to get it going.Spencerleehorton said:Getting smoke!!!
Have ordered some more LM317 as run out and all of them blew!!!
Shame they don’t do a LM7848 as would simplify the circuit using 7824 and 7848!!!
Pretty sure the circuit is correct now but need to use a new LM317 just to make sure.
Psu’s I’m always having a hard time with so this will be very rewarding once I have this down!!
Potato Cakes said:Spence,
How are you going to generate phantom power? Granted if you are getting 29VAC on your secondaries, that rectified will give you about 40VDC (AC x 1.4), which is plenty for a large number of condensers and active DIs, but it will be short of the 48V that most people are expecting when doing tests.
Thanks!
Paul
Spencerleehorton said:Its must be as you've said, too sensitive with the amount of volts going across, i will wait until i get a TL783 to go in the 48v section then retest.
Thought i would be ok with the LM317's!!!
Spencerleehorton said:Is it possible that Ive damaged the 1000uf cap on 48v and that’s why I’m getting these strange readings and can’t adjust to 48v?
I will change that cap and see
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