Boost converter w/ Frequency Change

bigphil · 20th June 2006, 11:47 PM

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!!!!

poobah · 21st June 2006, 12:50 AM

1) Stanadard linear power supply... maybe around 24 V +/-
2) Precision sine oscillator... maybe crystal derived
3) Class D amp
4) Step up transformer

bigphil · 21st June 2006, 12:58 AM

Any idea on cost for everything?

poobah · 21st June 2006, 01:31 AM

How many watts?

bigphil · 21st June 2006, 01:37 AM

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

poobah · 21st June 2006, 01:50 AM

Cool... there's so many ways to skin that cat...

bigphil · 21st June 2006, 01:51 AM

Quote:

Originally posted by poobah
How many watts?

3.3 VA according to the manual

poobah · 21st June 2006, 01:56 AM

3? THREE? Watts?

bigphil · 21st June 2006, 02:02 AM

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

poobah · 21st June 2006, 02:13 AM

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.

20th June 2006, 11:47 PM	#1
bigphil diyAudio Member Join Date: Nov 2005 Location: Toronto	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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21st June 2006, 12:50 AM	#2
poobah diyAudio Member Join Date: Nov 2005	1) Stanadard linear power supply... maybe around 24 V +/- 2) Precision sine oscillator... maybe crystal derived 3) Class D amp 4) Step up transformer

21st June 2006, 12:58 AM	#3
bigphil diyAudio Member Join Date: Nov 2005 Location: Toronto	Any idea on cost for everything?

21st June 2006, 01:31 AM	#4
poobah diyAudio Member Join Date: Nov 2005	How many watts?

21st June 2006, 01:37 AM	#5
bigphil diyAudio Member Join Date: Nov 2005 Location: Toronto	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

21st June 2006, 01:50 AM	#6
poobah diyAudio Member Join Date: Nov 2005	Cool... there's so many ways to skin that cat...

21st June 2006, 01:56 AM	#8
poobah diyAudio Member Join Date: Nov 2005	3? THREE? Watts?

21st June 2006, 02:13 AM	#10
poobah diyAudio Member Join Date: Nov 2005	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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