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smitchell82 · 1st September 2003, 01:14 PM

Hi, this might be a dumb question, but is there any way to get 15V out of a 8V supply without using a transformer?

thanks.

Sam

motion · 1st September 2003, 02:15 PM

Yes, use a voltage doubler circuit.

nettron1000 · 1st September 2003, 04:02 PM

Nice schematic Motion, but i think the output would be pulsating DC. It will need some type of filter or regulator after the output.

marcosmelchiori · 1st September 2003, 06:32 PM

The pulsating output would depend on the load. In fact, depending on the capacitor values and the load to be feed, the output would be DC. If it doesn´t work, mail-me for another solution.

smitchell82 · 2nd September 2003, 01:54 AM

Hmm, have you got any other solutions? I couldn't seem to get that one working in pspice. I need the 15V supply to power an opamp which is part of a circuit that must be very stable. so I need to get a constant and stable 15V out of an 8V supply.

Thanks.

Sam

nettron1000 · 2nd September 2003, 02:28 AM

Quote:

Hi, this might be a dumb question, but is there any way to get 15V out of a 8V supply without using a transformer?

You mentioned a transformer, is this 8 volts AC you're talking about?

smitchell82 · 2nd September 2003, 02:36 AM

sorry, take no note of the transformer comment. its DC, and Im having sever troubles trying to figure out how to give my opamp 15V off an 8V DC supply.

Any ideas?

Roff · 2nd September 2003, 04:42 AM

Maxim has some step-up switching regulators that might work for you. They are very generous with samples.

marcosmelchiori · 2nd September 2003, 12:58 PM

Here goes something. If I were you I´d go for the swtching step up regulator, for a more professional solution. Any way, if you are itented to make a cheap, home made solution this could be good for you. It´s a 555 used in astable oeration followed by a rectifier that will produce -Vp. That´s very usefull in most situation but if you need 15V you could just take -V as you groun refecence and than you´d have 16V between +V and -V.
As I said, it´s not a solution that I´d take in a professional design it´s just a hint for a cheap, home made project.

nettron1000 · 2nd September 2003, 03:03 PM

Heres another hint....

Smitchell, if you think about it all we're really doing is converting DC to AC and back to DC again.

Heres a circuit that may look abit familiar.

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1st September 2003, 01:14 PM	(permalink)
smitchell82	voltage amplifier Hi, this might be a dumb question, but is there any way to get 15V out of a 8V supply without using a transformer? thanks. Sam

1st September 2003, 04:02 PM	(permalink)
nettron1000	Nice schematic Motion, but i think the output would be pulsating DC. It will need some type of filter or regulator after the output. __________________ Two roads diverged into a woods...i took the one less travelled by. R. Frost.

1st September 2003, 06:32 PM	(permalink)
marcosmelchiori	Not really The pulsating output would depend on the load. In fact, depending on the capacitor values and the load to be feed, the output would be DC. If it doesn´t work, mail-me for another solution.

2nd September 2003, 01:54 AM	(permalink)
smitchell82	Hmm, have you got any other solutions? I couldn't seem to get that one working in pspice. I need the 15V supply to power an opamp which is part of a circuit that must be very stable. so I need to get a constant and stable 15V out of an 8V supply. Thanks. Sam

2nd September 2003, 02:36 AM	(permalink)
smitchell82	sorry, take no note of the transformer comment. its DC, and Im having sever troubles trying to figure out how to give my opamp 15V off an 8V DC supply. Any ideas?

2nd September 2003, 04:42 AM	(permalink)
Roff	Maxim has some step-up switching regulators that might work for you. They are very generous with samples.

2nd September 2003, 03:03 PM	(permalink)
nettron1000	Heres another hint.... Smitchell, if you think about it all we're really doing is converting DC to AC and back to DC again. Heres a circuit that may look abit familiar. __________________ Two roads diverged into a woods...i took the one less travelled by. R. Frost.