Silver box with a heatsink and a 33-45 switch - UK Vintage Radio Repair and Restoration Discussion Forum

defender · 8th Sep 2019, 8:14 pm

Don't know what it does I think it runs off 120v, as it was in a box with a UK to US voltage converter.
It has a pic16c54c chip and a US 2 pin input and a 2 pin output with a + on one side.

Electronpusher0 · 9th Sep 2019, 7:38 am

Possibly a box to output 50hz pseudo sinewave to power a UK 50Hz record deck from 60Hz mains supply.
The 33/45 switch would change the frequency of the output allowing you to run the deck at 45rpm without changing speed on the deck itself, just leave the deck set to 33.
Peter

Herald1360 · 9th Sep 2019, 9:55 am

With a US input and output socket and a 240:120 converter and "over here" it sounds more like a converter for a US 60Hz deck over here than t'other way about.

All that heatsinking suggests a few watts of output.

Plug it all in and see what comes out of the socket- beware it may not be mains isolated!

defender · 9th Sep 2019, 12:58 pm

I'm tempted to see what happens when I plug it in I'll use my isolation transformer.

8th Sep 2019, 8:14 pm	#1
defender Pentode Join Date: Dec 2017 Location: Huddersfield, West Yorkshire, UK. Posts: 192	Silver box with a heatsink and a 33-45 switch Don't know what it does I think it runs off 120v, as it was in a box with a UK to US voltage converter. It has a pic16c54c chip and a US 2 pin input and a 2 pin output with a + on one side. Attached Thumbnails

9th Sep 2019, 7:38 am	#2
Electronpusher0 Nonode Join Date: Jun 2016 Location: Bognor Regis, West Sussex, UK. Posts: 2,296	Re: Silver box with a heatsink and a 33-45 switch Possibly a box to output 50hz pseudo sinewave to power a UK 50Hz record deck from 60Hz mains supply. The 33/45 switch would change the frequency of the output allowing you to run the deck at 45rpm without changing speed on the deck itself, just leave the deck set to 33. Peter Last edited by Electronpusher0; 9th Sep 2019 at 7:41 am. Reason: spelling

9th Sep 2019, 9:55 am	#3
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: Silver box with a heatsink and a 33-45 switch With a US input and output socket and a 240:120 converter and "over here" it sounds more like a converter for a US 60Hz deck over here than t'other way about. All that heatsinking suggests a few watts of output. Plug it all in and see what comes out of the socket- beware it may not be mains isolated! __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

9th Sep 2019, 12:58 pm	#4
defender Pentode Join Date: Dec 2017 Location: Huddersfield, West Yorkshire, UK. Posts: 192	Re: Silver box with a heatsink and a 33-45 switch I'm tempted to see what happens when I plug it in I'll use my isolation transformer.