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: Hash Filter Model

Posted by Eli Duttman on April 2, 2017 at 09:57:07:
Go for it! My objective was to block noisy crud, regardless of source, from sneaking into the reservoir capacitor. There is always room for variations on a theme.

FWIW, I'd still like to see a simulation with a LC reservoir section located after the "hash" filter. Superior designs, like the "Deuce", some McIntosh models, and some Marantz models, include the LC reservoir section following the doubler stack. The choke is not particularly large valued. When big caps., ala McShane, are used at the I/P of a PSU filter, the ripple waveform is highly "triangular". Applying Fourier's Theorem to that "sharp" waveform led me to call for "hash" filtration immediately following the I/P capacitance. Energy well up into RF "territory" is present that can get past the principal choke, via its real world winding capacitance. Kill the garbage before it gets to the "back door".