Re: Wiring toroidal transformer in parallel
Thanks, guys. I have just wired the AC to DC transformer bits together for the first time and connected it to the mains. I have not yet used a 'delay on' timer relay and just wired an NTC thermistor on the live between mains in and the primary winding. On first switch on nothing dramatic happened and I am getting 53 volts at the DC output which is close to what I wanted. I was surprised that the thermistor did not get hot like I thought they were supposed to. Could this be because there is no load on the DC output? Similarly the bridge rectifier does not seem hot or even warm. Is this normal? The thermistor is a SL15 2R507 that Airlink transformers recommend for toroidals up to 1kVA
Regards ...Chris
Re: Wiring toroidal transformer in parallel
Quote:
Originally Posted by
chillybo
Similarly the bridge rectifier does not seem hot or even warm. Is this normal? The thermistor is a SL15 2R507 that Airlink transformers recommend for toroidals up to 1kVA
Regards ...Chris
Keep an eye on it under load, but there's many toroidal running with just NTCs - that's what they're designed for. If it works - you've saved yourself £40.
(Mine has just an NTC on a 800VA transformer)
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Re: Wiring toroidal transformer in parallel
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Just need to create a load for it now so I need to know what are the best stepper drivers for my set up. It will probably be better to start a new thread for this.
Regards ...Chris
Re: Wiring toroidal transformer in parallel
The second one looks like a bit of a home project, TBH. The first (German) one looks pretty sensible, containing an NTC, timer relay and overtemp protection.
Re: Wiring toroidal transformer in parallel
In post 10 ,the second link for the
"Soft-start, inrush current limiter for toroidal transformers-assembled, tested"
reminded me of project 39 from Elliott Sound Products
Soft-Start Circuit For Power Amps
http://sound.whsites.net/project39.htm
project list
http://sound.whsites.net/p-list.htm
John