Eric,
You can get the SB200 schematic at http://bama.sbc.edu/heath.htm
73, Harry, W3IIT
At 02:59 AM 02/02/2000 -0700, measures wrote:
>
>>
>>Anyone have a jpeg scan of an SB200 schematic or know of a web site
>>containing the schematic ?
>>
>>I am installing a Harbach soft key board and am having some voltage
problems
>>with trying to rectify one side of the filament transformer to obtain 3v DC.
>>
>I would convert the sb200 from negative polarity RL control to positive.
>Basically, this envolves getting rid of the inane biasing sheme and
>converting to something like the sb-220 configuration, with high-speed
>switching to fix the hot-switching problem. . Our soft-key parts kit
>goes for 50 cents. It will switch 300v positive at 500mA in around 1 uS.
> .
>
>cheers, Eric
>
>
>- Rich..., 805.386.3734, www.vcnet.com/measures.
>
>
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