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[Amps] Fw: Step Start on a 3KA Amp

PA3DUV
 

Hal,

The softstarter in the Emtron amps is a phase control triac system, not a zero crosser. It allows gradually more of the primary AC sinewave into the powersupply. By doing so there is no need for a series resistor to limit the inrush current.
Although the series resistor current limiter is effective I consider the phase control system more gracious.

I have put a quicktime movieclip on
showing the softstarter power up a lightbulb.

Cheers, Dick
PA3DUV

----- Original Message -----
From: "Harold Mandel" <ka1xo@...>
To: "'PA3DUV'" <pa3duv@...>
Sent: Thursday, September 21, 2006 1:26 PM
Subject: RE: [Amps] Fw: Step Start on a 3KA Amp


Dick,

I think the Emtrons are zero crossers.

Pat Stein uses them in the Commander series, too.

The amp never makes a thump when it's switched on,
not like the Alpha clone that makes the floor jump.

Hal

Ian,

A picture of the Emtron switched mode softstarter + schematic diagram are
available at:



I've heard that Emtron is selling their softstarter as a seperate item.
This softstarter is a small switcher which chops the AC voltage, by doing
so limiting the inrush current.

Cheers, Dick
PA3DUV

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