[ARC5] [Milsurplus] Sandy Coolness for Our BAs

[Dennis Monticelli]

The one transistor NPN control device probably just has a zener between its
emitter and ground.  A resistor divider across the output has its tap
connected to the base of that NPN.

I don't know what the SOA of that Darlington is or if there is another NPN
in there serving as a current limit.  In other words it may not survive a
screwdriver short so beware.

Dennis AE6C

On Fri, May 12, 2017 at 10:15 PM, David Stinson <arc5 at ix.netcom.com> wrote:

> ----- Original Message ----- From: "Tom Lee" <tomlee at ee.stanford.edu>
> Subject: Re: [ARC5] [Milsurplus] Sandy Coolness for Our BAs
>
>> If this part is like some of the TV regulators I've encountered in the
>> past, the base terminal needs to be pulled up to the unregulated input
>> voltage through a resistor. Depending on the input-output differential
>> you seek, the resistor will be of the order of 10k or so, typically.
>> Frequency compensation is also frequently required, and the base
>> terminal is a convenient place to connect an appropriate stabilization
>> network (e.g., C or series RC to ground).
>>
>
> Mr. Tom Lee was exactly correct.
> Many thanks also to Bob AH7I, and
> John Kidd from Australia for more info
> and details.
> 10 K from INPUT to BIAS, .1 uFd
> from BIAS to COMMON and 10 uFd on
> the OUTPUT, similar to what one would do
> with a common low-V regulator.
> The isolation transformer, bridge and
> 47 mFd filter is supplying ripply 180V
> peak to the regulator device.
> A nice, clean and steady 135V is
> running the receiver.
>
> Gentlemen like you continue to prove
> that my confidence in our community
> is well-founded.
>
> TNX OM ES 73 DE Dave AB5S
>
>
>
> ----- Original Message ----- From: "Tom Lee" <tomlee at ee.stanford.edu>
> Subject: Re: [ARC5] [Milsurplus] Sandy Coolness for Our BAs
>
>
> If this part is like some of the TV regulators I've encountered in the
>> past, the base terminal needs to be pulled up to the unregulated input
>> voltage through a resistor. Depending on the input-output differential
>> you seek, the resistor will be of the order of 10k or so, typically.
>> Frequency compensation is also frequently required, and the base
>> terminal is a convenient place to connect an appropriate stabilization
>> network (e.g., C or series RC to ground).
>>
>
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