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Conversion of a TRF Tuner using a 125 Volt DC to 12/24 volt Wallwart
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Return to top of page · Post #: 1 · Written at 11:12:51 AM on 1 October 2018.
	Jordan Dobrikin Location: Burnaby, CA Member since 1 October 2018 Member #: 2300 Postcount: 1
Hi, I am seeking assistance in modifying the TRF Tuners to operate at lower safe voltages To use 12 or 24-volt Wall Warts To eliminate the need for a heavy expensive high voltage power supplies. I am planning to retrofit several 1920's 3 RF Tuning Stages Chassis/Radios like Atwater Kent Model 20. https://www.americanradiohistory.com/Archive-Radio-World/30s/36/Radio-World-1936-Nov.pdf http://www.antiqueradios.com/forums/viewtopic.php?f=12&t=304778 thanx 73 de jordan ve7jjd

Return to top of page · Post #: 2 · Written at 1:16:51 PM on 1 October 2018.
	Fred Lever Location: Toongabbie, NSW Member since 19 November 2015 Member #: 1828 Postcount: 1250
Hi Jordan, I can see the application is to provide heater and HT, but what the heck is a "Wall Wart"? Fred.

Return to top of page · Post #: 3 · Written at 1:34:09 PM on 1 October 2018.
	Tippy Location: Mount Cotton, QLD Member since 20 February 2018 Member #: 2214 Postcount: 134
Fred, a wall wart is American for a plug in power adaptor

Return to top of page · Post #: 4 · Written at 6:43:51 PM on 1 October 2018.
	Fred Lever Location: Toongabbie, NSW Member since 19 November 2015 Member #: 1828 Postcount: 1250
Thanks Tippy, i'm old and only speak English! So we need a circuit to "invert" the output of about a 100 watt power adaptor to give 6.3 volt at amps and HT at milliamps. Should be a walk in for some chopper chip thing or a Pic chip? Hey Ian is not that what your old time radio power supply does? I'm out of my depth here as I only know about valves...………………………. Fred.

Return to top of page · Post #: 5 · Written at 8:30:07 PM on 1 October 2018.
	Ian Robertson Location: Belrose, NSW Member since 31 December 2015 Member #: 1844 Postcount: 2370
As Fred suggested, would something like this work for you? https://vintage-radio.com.au/default.asp?f=1&th=1181 It is simple to modify for different voltages and uses easy to get parts. PCBs are available from Silicon Chip magazine, who published it as a project. Wall warts (we call them Plugpacks) these days are normally too noisy to use with any AM radio.

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