[Milsurplus] Sandy Coolness for Our BAs

[John Schmitz]

After further studying the internals scat it occurs to me there is no start
up to start the regulator working. I'm betting the base pin needs a resistor
to the input to get the regulator started when voltage is first applied.
Looking at the specs it appears to should maybe be a 10-12K resistor between
the base pin and the input pin. This is kind of interesting. I have some
STR's and now I'm really tempted to play with it a little.

John Schmitz

-----Original Message-----
From: John Schmitz [mailto:cjs004 at comcast.net]
Sent: Saturday, May 13, 2017 8:10 AM
To: David Stinson; ARC-5; milsurplus at mailman.qth.net;
boatanchors at mailman.qth.net
Subject: RE: [Milsurplus] Sandy Coolness for Our BAs


These types of regulators were very popular in TV's for awhile. These NTE
regulators are replacements for the the orginal STR series of regulators.
I'm going to try and attach a data sheet for the STR3110 thru STR3130 series
of regulators. Manufacturer is Japanese Sanken and the attachment is in
Japanese but it does have a scat of the internals. Looks like you may not
have to connect anything to the base pin it may work with nothing connected
but not sure. Perhaps this additional base pin was a way to cut the
regulator off. Possibly used by the saftey circuits in the TV that shut the
TV down if HV gets to high. But at least with a scat you can play with it.
If the attachment doesn't come through google STR3125 regulator and you
should find the scat I tried to attach.

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net]On Behalf Of
David Stinson
Sent: Friday, May 12, 2017 7:28 PM
To: ARC-5; milsurplus at mailman.qth.net; boatanchors at mailman.qth.net
Subject: [Milsurplus] Sandy Coolness for Our BAs


New devices that make reviving our loved radios
simplier and less expensive are appearing regularly.
The mass marketing of large LCD and Plasma
TVs have birthed some pretty cool devices.
Just found this honey today, an NTE1743.

https://goo.gl/photos/iXzL1SaXKNczYTQi7

The little wonder was soooo expensive: $9 ;-)
It's a high-voltage regulator similar to the little
LM317 things for low voltage, but this one
takes DC under 200V peak and delivers
135 V +/- 0.8V; just right for "reduced B+"
projects.  NTE1776, 1777, 1778, 1743
deliver 120, 130, and 135 Volts fixed,
good for an Amp (if you can source that much).
Originally designed to follow the AC-line-
bridge rectifier-regulator architecture.
I'm going to use it with a transformer.

So I'm building what is, I think, going
to be the easiest regulated receiver supply
ever.  B+/Fil transformer, bridge rectifier,
47 uFd filter cap and the regulator.
Should work a treat and be rock stable.
Will let ya know.

73 DE Dave AB5S

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