60 V regulated for preamp supply

[h_a]

Andrew, you're a reliable fellow

After typing the last post in a hurry, I already thought you would object - and you're right.

<Edit: I thought of suggesting a voltage clamp to limit differential voltage, but thinking of it it's maybe not a good idea as the components after the regulator would see the high voltage as well>

Concerning power dissipation: a quick estimate gives me 40ms charging time for a single 1000uF output cap, assuming the current to be constant and at current limit (1.5A). The power dissipation per second would be 45 W then, which the part should survive since this number only lasts for the 40 ms charging time.

However by taking another look at the datasheet it's clear that my quick and dirty calculation even overestimates the power dissipation as the current limit is not 1.5A, but only 0.4A for more than 40V voltage difference.

I agree, it's easiest just to take a higher voltage regulator.

Have fun, Hannes

[AndrewT]

or short in to out with a 36V Zener.

[lineup]

Any more thoughts on my circuit, AndrewT

you are welcome

/lineup

[nonoise]

Perhaps a bit on the edge of its capabilities but another option to consider is the Linear Technology LT3012
http://www.linear.com/pc/productDeta...0,C1055,P13772

[ginetto61]

Originally Posted by AndrewT

but, you must limit the voltage drop across the 317 at start up.

or short in to out with a 36V Zener

Please excuse me Sir if I take again this very interesting 3D
First of all a precisation
I went today to RS to buy some TL783 to build a 60V regulated PS (I started another 3D on this)
As the 783s were not available but they must be ordered to make a long story short I went out with some LM317TG
I understand from this 3D that the 317, with some precautions, can be used to regulate high voltages (I need a Vout=60V)
If I also understand well the main precaution is to place a 36V zener across its in and out pin ? (I hope to orientate it correctly)
As you may be understand I am very beginner.
A friend of mine gave to me a bride of zen preamp but without the PS.
Thank you very much again and kind regards,
ginetto

[ginetto61]

Last question
What about the protection diodes usually used with the lm317 like here
http://www.elecfree.com/electronic/w...5v6v9v_15a.jpg
Which IN4001 will the 36V zener replace ?
Sorry to ask all of these question but I have already burnt half a dozen 317
One even collapsed on itself with a loud sound
Thanks and regards,
ginetto

[AndrewT]

the diode from IN to OUT

[ginetto61]

Originally Posted by AndrewT

the diode from IN to OUT

Thank you very much indeed
Sorry for the belated reply but I was out for the weekend.
As the lm317 is such an easily available and cheap part this solution is extremely interesting.
Kind regards,
ginetto