Transformer Question

This Forum is about the Opentherm gateway (OTG) from Schelte

Moderator: hvxl

Transformer Question

Postby david_wallis » Sat Oct 12, 2013 7:28 pm

I'm just looking at building an opentherm gateway to see if I can talk to my vokera boiler which apparently has an OT interface.

however just looking at the schematic and it has what looks like a 15v transformer, yet shows 24v just before the 7805.. Am I missing something here or can I just buy a 15v Transformer?

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Re: Transformer Question

Postby raymonvdm » Sat Oct 12, 2013 9:38 pm

The gateway is a complete build and after build it is just accepting 230v and uses the onboard transfomer (the blue block) to get 24v to use between the gateway and the thermostat

Last edited by raymonvdm on Sat Oct 12, 2013 9:51 pm, edited 1 time in total.
Running HS3PRO on PC with Z-Wave / OpenTherm / Plugwise / RFXcom / MQTT / XAP400 / Logitech Media Server and Squeezelite on PI`s
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Re: Transformer Question

Postby hvxl » Sat Oct 12, 2013 9:50 pm

I know I have answered this question before... Found it. See this post.
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