DC-DC step up converter?

markusA · 09:14 PM

Is there an easy way of stepping up your DC voltage?

richie00boy · 27th October 2010, 09:56 PM

You can multiply it by whole numbers, e.g. 2x, 3x, 4x etc but only at currents of a few mA. Using a 555 timer.

Sch3mat1c · 27th October 2010, 11:43 PM

Yes, hundreds of methods.

Could you give a specific purpose, i.e. input and output voltage and current ranges, efficiency, ripple, etc.?

Tim

wwenze · 28th October 2010, 12:28 AM

eBay is one easy method.

tomchr · 28th October 2010, 12:36 AM

Look up "boost converter" or "buck/boost converter". A boost converter can be as simple as a 555 timer IC, MOSFET switch, inductor, diode, and output cap. Feedback is preferred, though.

Rather than building your own converter, you could also use one of the many available ICs. Look in the Power section of National Semiconductors, Texas Instruments, and others.

Above assumes that you're talking relatively low voltages (< 40 V).

wakibaki · 28th October 2010, 01:04 AM

Circuit - +5v Powered Charge Pump Battery Charger - Circuits designed by David A. Johnson, P.E.

Voltage doubler, only good for ~70mA

w

markusA · 06:23 AM

It's a small power supply, 21-24VDC @ 100mA.
I wan't to use stuff that I have lying around instead of spending money on a new wall wart.

Input voltage? I guess anything between 5-18VDC? There are lot's of wall wart lying around.

None big enough to do it on it's own though. :/

Linear operation is good, switch mode supplies tend to deteriorate the audio signal in the end. It's for a Lightspeed clone.

richie00boy · 28th October 2010, 12:23 PM

Not possible without going the switching route. If you had AC wall warts at least you could halfwave voltage double then regulate.

markusA · 28th October 2010, 01:44 PM

That's what I was afraid of.
It's no problem anyway, I found a suitable 24VAC wall wart.
A regular psu should pose no problem and I found allmost all the parts I need in the parts bin.

Maybe I'll find the rest as well if I look again.

Sch3mat1c · 28th October 2010, 04:32 PM

Noise, who needs it. A big chunky cap on the output (220uF as shown, plus 10uF tantalum, would be plenty) keeps ripple down, and an LC filter will keep RFI away.

Tim

27th October 2010, 09:08 PM	#1
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	DC-DC step up converter? Is there an easy way of stepping up your DC voltage? Last edited by markusA; 27th October 2010 at 09:14 PM.

27th October 2010, 09:56 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	You can multiply it by whole numbers, e.g. 2x, 3x, 4x etc but only at currents of a few mA. Using a 555 timer. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

27th October 2010, 11:43 PM	#3
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Yes, hundreds of methods. Could you give a specific purpose, i.e. input and output voltage and current ranges, efficiency, ripple, etc.? Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

28th October 2010, 06:20 AM	#7
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	It's a small power supply, 21-24VDC @ 100mA. I wan't to use stuff that I have lying around instead of spending money on a new wall wart. Input voltage? I guess anything between 5-18VDC? There are lot's of wall wart lying around. None big enough to do it on it's own though. :/ Linear operation is good, switch mode supplies tend to deteriorate the audio signal in the end. It's for a Lightspeed clone. Last edited by markusA; 28th October 2010 at 06:23 AM.

28th October 2010, 12:23 PM	#8
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Not possible without going the switching route. If you had AC wall warts at least you could halfwave voltage double then regulate. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

28th October 2010, 12:28 AM	#4
wwenze diyAudio Member Join Date: Mar 2008	eBay is one easy method.

28th October 2010, 12:36 AM	#5
tomchr diyAudio Member Join Date: Feb 2009 Location: Greater Seattle Area	Look up "boost converter" or "buck/boost converter". A boost converter can be as simple as a 555 timer IC, MOSFET switch, inductor, diode, and output cap. Feedback is preferred, though. Rather than building your own converter, you could also use one of the many available ICs. Look in the Power section of National Semiconductors, Texas Instruments, and others. Above assumes that you're talking relatively low voltages (< 40 V).

28th October 2010, 01:04 AM	#6
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	Circuit - +5v Powered Charge Pump Battery Charger - Circuits designed by David A. Johnson, P.E. Voltage doubler, only good for ~70mA w

28th October 2010, 01:44 PM	#9
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	That's what I was afraid of. It's no problem anyway, I found a suitable 24VAC wall wart. A regular psu should pose no problem and I found allmost all the parts I need in the parts bin. Maybe I'll find the rest as well if I look again.

28th October 2010, 04:32 PM	#10
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Noise, who needs it. A big chunky cap on the output (220uF as shown, plus 10uF tantalum, would be plenty) keeps ripple down, and an LC filter will keep RFI away. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Voltage doubler using PSUII?	Brit01	Tubes / Valves	36	4th September 2010 02:41 AM
Need help with voltage doubler	Lingwendil	Power Supplies	6	22nd April 2009 12:15 AM
Voltage Doubler	jwatts	Tubes / Valves	3	2nd January 2009 12:13 AM
Voltage doubler	Baard	Solid State	28	17th January 2005 04:46 AM
Voltage Doubler Problem	runeight	Tubes / Valves	10	7th April 2004 04:16 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read