[GreenKeys] Loop supply options

[Ralph Mowery]

You may want to use something like I have played with.  It is a dc to dc
module. They cost around 5 ot 10 dollars from China.  It takes from about 10
to 20 volts input and will give you 50 to 300 volts out.  You can do like I
did and feed it with a wall cube that has about 12 volts to 20 volts output
at 1 to 2 amps.  That and a resistor of about 2000 ohms at 10 to 20 watts is
all you need.  You can adjust the voltage to set the current to 60 ma or 20
ma with a different resistor.
If you go this route, be careful as it is powered by a 12 v cube the high
voltage output can be deadly just as any high voltage.


https://www.ebay.com/itm/DC-DC-10-32V-to-45-390V-High-Voltage-Boost-Converte
r-Step-up-Booster-Module-Lh/392189368487?hash=item5b504ed8a7:g:rZUAAOSwPWRZX
F4g

As others have mentioned be sure to use a resistor with the supply you
mentioned (or any other one) of around 2000 ohms for a 100 to 150 volt
supply to set the current to 60 ma, or 20 ma in some cases.
You can often get by with about 50 volts if it is just one machine and
local, not over the radio.

Ralph ku4pt




-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Harold Hallikainen
Sent: Saturday, September 07, 2019 11:32 AM
To: Jeffrey Angus
Cc: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Loop supply options

When I finally power up my Teletype, I plan on using this as a loop supply:

https://www.mouser.com/ProductDetail/International-Power/IHB120-02?qs=MKoP7O
yr0W4tUbkG3QpCWg%3D%3D

Harold



---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus