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Re: [Amps] Zero Crossing circuit

To: "" <>
Subject: Re: [Amps] Zero Crossing circuit
From: Will Matney <>
Date: Thu, 18 Nov 2004 11:00:51 -0500
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To me, as long as it keeps the inrush current down to an acceptable level, it's okay with me. If you don't hear that big thump, something is doing its job I would think. I've never had any experience with zero crossing circuits so I cant comment that much. I just understand the theory behind them. All I do know is that step start works to reduce it. The only way to tell for sure is measure the peak "on" current that's drawn. If it's okay, then the components wont get jarred as hard.

Best & 73's

Will Matney

Bill Turner wrote:

On Wed, 17 Nov 2004 16:19:47 -0600, Phil Clements wrote:

Zero crossing circuits (solid-state relays) are far too fast acting for use as a soft-start device, Ed.

A properly designed soft-start circuit has a delay equal to the time it takes the H.V. meter to reach 2/3 of the way to its normal reading.


I must disagree.  My Command HF-2500 uses zero-crossing solid state
devices to turn on and they work perfectly.  There is no thump, no
noise, and the turn-on is smooth as silk.  Other than those devices,
there is no soft-start circuit of any kind.

Bill W6WRT

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