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Old 20th June 2006, 11:47 PM   #1
bigphil is offline bigphil  Canada
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Default Boost converter w/ Frequency Change

Hi guys, I reccently aquired a turntable that is setup for European mains, so it runs on 220V with 50Hz. Over here the mains is (obviously) 120V with 60hz.

Do you know of any converters that will change the frequency as well as boost the voltage for a reasonable price?

I have worked with these sort of power systems before in class, only on a much larger scale. A TT wouldn't need much power, so I'm thinking a converter could be built from scratch for relatively cheap - but I may be wrong. If there are already designs out there, I would appreciate some help - pointing me in the right direction.

If feasible, i think building my own converter/supply could have lots of benefits including precision and ensuring that the TT gets a really clean power source. I figure I would need the following modules:

1. Rectification AC/DC
2. Boost converter for the DC voltage
3. Sinusoidal PWM (?) DC/AC converter w/ variable frequency

I am familiar with the first two steps, but unsure on the last step, approx. how much would a deccent DC/AC converter cost? Is it worth the hassle? I thorough enjoy doing these things so I wouldnt mind a bit of work. TIA!!!!
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Old 21st June 2006, 12:50 AM   #2
poobah is offline poobah  United States
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1) Stanadard linear power supply... maybe around 24 V +/-
2) Precision sine oscillator... maybe crystal derived
3) Class D amp
4) Step up transformer
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Old 21st June 2006, 12:58 AM   #3
bigphil is offline bigphil  Canada
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Any idea on cost for everything?
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Old 21st June 2006, 01:31 AM   #4
poobah is offline poobah  United States
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How many watts?
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Old 21st June 2006, 01:37 AM   #5
bigphil is offline bigphil  Canada
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Nevermind, "Sine Oscillator" gets me some good results in the search, I have some stuf to read over now Thanks as always poobah.

for anyone else stumbling/searching, here is a good thread to get you started:

Change in frequency mains
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Old 21st June 2006, 01:50 AM   #6
poobah is offline poobah  United States
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Cool... there's so many ways to skin that cat...

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Old 21st June 2006, 01:51 AM   #7
bigphil is offline bigphil  Canada
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Quote:
Originally posted by poobah
How many watts?

3.3 VA according to the manual
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Old 21st June 2006, 01:56 AM   #8
poobah is offline poobah  United States
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3? THREE? Watts?
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Old 21st June 2006, 02:02 AM   #9
bigphil is offline bigphil  Canada
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Quote:
Originally posted by poobah
3? THREE? Watts?

maybe I'm mis-reading?


http://www.vinylengine.com/library_m...cted_model=IIX

click the first link under downloads, its only a couple KB .... last page has specs
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Old 21st June 2006, 02:13 AM   #10
poobah is offline poobah  United States
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Check out Section 3.10 of the manual. It might be implying that all you have to do is flip some wires around inside. Wouldn't that be cool?

Maybe start a new thread with brand and model number in the title.

Plenty of Scots and Brits here.

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