Re: TDC DC

[P3D John W Roberts <roberts@xxxxxxxxxxxxxxxxx>]

>Date: Mon, 14 Jul 1997 17:43:22 -0500
>From: P3D Michael Kersenbrock <michaelk@xxxxxxxxxxxxxxxxxx>
>Subject: Re: TDC DC

>Straight full-wave rectification plus a capacitor would yield about 160 VDC.

Assuming no load. With a resistive load, there will be an AC component 
("ripple"), and the RMS voltage will be lower.

I would consider big 120VAC capacitors to be fairly risky to use without
fairly elaborate precautions.

>Similar sorts of surge "protection" have been done for the last half
>century by ham radio folk ("I are one" or used to be) for the filaments
>of their power amplifiers.  Put a power resistor in series with the
>bulb and a relay's winding accross the bulb.  Have the contacts of the
>relay be across the resistor.  

That sounds a lot more reasonable.

I thought there were devices on the market to limit the startup surge of
incandescent light bulbs.

John R


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