TW39 to Double Current with FSG System

Fachforen für Entwickler und Bastler
Antworten
Benutzeravatar

Topic author
M1ECY
Rank 9
Rank 9
Beiträge: 828
Registriert: Fr 11. Aug 2017, 13:13
Wohnort: Hitchin Hertfordshire, UK
Hauptanschluß: 669089

TW39 to Double Current with FSG System

#1

Beitrag: # 49344Beitrag M1ECY »

Been working away on this project for some time now - on and off for the past 5 years..

Had a burst of enthusiasm between Christmas and the New Year, and wanted to actually get on and build something useful, so here is the progress so far
Telex Control Unit.jpeg
Concept works like this:

TW39 level input and is controlled by the simple FSG as published here by Horatius - this takes care of the motor control and keeping I-Telex happy.

The output of this is then fed into an electronic Polar Relay, via optocoupler isolation.

The Polar Relay takes care of the conversion from Single Current to Double Current - A pair of generously rated transistors switch the output between +/- supply as needed.

All of this is on the upper board in the picture.

The lower board is the power supply, and also houses the switching relay for power to the machine.

There are two versions currently in build/test - One to suit the English machines, and one to suit French machines - all are Double Current, and 20mA loop, but the French machines prefer a lower voltage of around 48V.

Still plenty to do, but theres progress....
Du hast keine ausreichende Berechtigung, um die Dateianhänge dieses Beitrags anzusehen.
Folgende Benutzer bedankten sich beim Autor M1ECY für den Beitrag (Insgesamt 8):
380170JFKDF3OExachsewagduddsigSO36TlxroliwG8LHSobrecht
669089 Siemen G - T100S Online 24H (Online again)
299709 Antosh G - Creed 444 - Double Current R + D (0800 - 2100) Should be reachable
459724 NC
Antworten

Zurück zu „Entwickler-Ecke“