Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login

By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username: The Name that you picked or by default, your email. Forgot Moniker?	Examples "Rapper", "Bob W", "joe@aol.com".
Password:	Forgot Password?
	Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:
Your Email:
Subject:

Message Comments

Original Message

RE: Increase L in pi network

Posted by Eli Duttman on September 22, 2017 at 02:14:31:
As this data sheet indicates, you could be pressing your luck with a 47 μF. part in the 1st position of the PSU filter.

IF the DCR of the 2 inductors is the same, a larger inductance yields less ripple, without changing the rail voltage.

If a "swinging" choke is on hand, I would not use it in a П section filter, as it's inductance varies with the current being passed. A "normal" choke intended for critical current duty will be fine. Inductors in choke I/P filters are subjected to much greater strain than those in cap. I/P filters and are constructed accordingly. If an inductor not specifically rated for choke I/P service is to be employed that way, substantial derating of its current handling capability is necessary.