[GreenKeys] USB interface to ASR Mod 33 Teletype

[john at toebes.com]

Hi All,

  I'm looking at the best way to connect an Android Phone (USB) to a ASR Mod
33 teletype.  To the best of my knowledge, I have found 4 possible interface
circuits:

 

1.	http://aetherltd.com/connectingusb.html Connects a Silicon
Laboratories CP2102-EB to a second Teletype to RS-232 board (Designed for
Teletype Model 15 with Baudot)
2.	https://trmm.net/Boost_converter uses a Teensy with the Adafruit
DC/DC Boost circuit (last update 15-Aug-2013) 
3.	http://avitech.com.au/?page_id=318 is a USB Powered Current Loop
Interface (last updated in27-Dec-2014)
4.	http://heepy.net/images/8/8b/Usbtty-instructions.pdf  /
http://heepy.net/index.php/USB-teletype USB Serial Teletype Loop Adapter
posted to Greenkeys April 2016

 

I'm interested in finding out from people which (if any) people are using
and what is the most resilient (or if there are other solutions I should
look at).  

Thanks!

*	John

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