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: what do you look for in the graphs?

Posted by Tre' on May 28, 2017 at 19:29:14:
Those are broad questions.
I assume the reason you are simming the supply is to predict the voltage and ripple?
Those are shown in the graph when you have V(C[last cap]) checked.
If your supply is cap input then you might also look at the charging currents to the first cap, I(C1).
The higher the first cap's value, the higher the charging current and the shorter the "on" time for each diode. This is also shown on the graph.
Also look at the diode "peak current" I(D1). Also shown on the graph.
Make sure the peak repetitive current rating (IFRM) of the rectifier tube is not exceeded.
With the step response you can see if the supply is ringing.
That is shown on the graph (with V(C[last cap]) checked) by the voltage "bouncing" up and down several times before settling down after the current "step".
A smooth "ski slope" (without the bouncing) shows a non-ringing behavior of the supply.
If you set the sim to run for 20 seconds after a reporting delay of 6 seconds and set the current step to increase the current by 10 or 20% after 8 seconds then you get a clean graph without things "running into" each other.
Tre'