Piezo Amplifier
in [Design]
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From: Jim Thompson on 3 Dec 2009 09:44 On Mon, 30 Nov 2009 23:33:30 +0100, "@@@Klaus@@@" <klaus_my(a)hotmail.com> wrote: >Hello to everybody! >It is the first time I write here and I apoligize for my poor >english. >I am working on an amplifier for driving piezo stacks and I >need a sinusoidal voltage of 500 V peak with mean value of 500 >V. To keep things "quite simple" I'll work at slow frequencies, >so that the current in the stack (capacitance of 1 uF) is >"reasonable", say it max 0f 50 mA. As a first attempt, I am >evaluating the circuit proposed in AoE p. 169, which has been >suggested in this ng in the past for similar applications. >This amplifier (or other equivalent designs) employs a 1kV >power supply for the power mos, so my question is: how can I >realize 1 kV power supply for this kind af amplifier (actually >I need 3 amplifiers)?Rising transformers?Multiplying >circuits(diodes+caps)? > >Thanks for your advices, > >K. Me? I'd go the old-fashioned way, step-up line transformer, then rectify. The I'd use... are you ready for this... vacuum tubes ("valves" on the other side of the pond) for the amplifiers. Everyone always wants exotic (and failure prone). ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | You can never be too prepared for the REPRESSION!
From: Joerg on 3 Dec 2009 17:59 Jim Thompson wrote: > On Mon, 30 Nov 2009 23:33:30 +0100, "@@@Klaus@@@" > <klaus_my(a)hotmail.com> wrote: > >> Hello to everybody! >> It is the first time I write here and I apoligize for my poor >> english. >> I am working on an amplifier for driving piezo stacks and I >> need a sinusoidal voltage of 500 V peak with mean value of 500 >> V. To keep things "quite simple" I'll work at slow frequencies, >> so that the current in the stack (capacitance of 1 uF) is >> "reasonable", say it max 0f 50 mA. As a first attempt, I am >> evaluating the circuit proposed in AoE p. 169, which has been >> suggested in this ng in the past for similar applications. >> This amplifier (or other equivalent designs) employs a 1kV >> power supply for the power mos, so my question is: how can I >> realize 1 kV power supply for this kind af amplifier (actually >> I need 3 amplifiers)?Rising transformers?Multiplying >> circuits(diodes+caps)? >> >> Thanks for your advices, >> >> K. > > Me? I'd go the old-fashioned way, step-up line transformer, then > rectify. > > The I'd use... are you ready for this... vacuum tubes ... Ye olde 6KD6 would be a candidate here: http://www.nj7p.org/Tube4.php?tube=6KD6 > ... ("valves" on the other side of the pond) for the amplifiers. > Or "lampes" where Fred lives :-) > Everyone always wants exotic (and failure prone). > Nah, done it transistorized, many times. What are you afraid of could go wrong? Under five bucks, meaning even less than a Russian tube: http://ixdev.ixys.com/DataSheet/99036.pdf -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jim Thompson on 3 Dec 2009 21:45 On Thu, 03 Dec 2009 14:59:49 -0800, Joerg <invalid(a)invalid.invalid> wrote: >Jim Thompson wrote: >> On Mon, 30 Nov 2009 23:33:30 +0100, "@@@Klaus@@@" >> <klaus_my(a)hotmail.com> wrote: >> >>> Hello to everybody! >>> It is the first time I write here and I apoligize for my poor >>> english. >>> I am working on an amplifier for driving piezo stacks and I >>> need a sinusoidal voltage of 500 V peak with mean value of 500 >>> V. To keep things "quite simple" I'll work at slow frequencies, >>> so that the current in the stack (capacitance of 1 uF) is >>> "reasonable", say it max 0f 50 mA. As a first attempt, I am >>> evaluating the circuit proposed in AoE p. 169, which has been >>> suggested in this ng in the past for similar applications. >>> This amplifier (or other equivalent designs) employs a 1kV >>> power supply for the power mos, so my question is: how can I >>> realize 1 kV power supply for this kind af amplifier (actually >>> I need 3 amplifiers)?Rising transformers?Multiplying >>> circuits(diodes+caps)? >>> >>> Thanks for your advices, >>> >>> K. >> >> Me? I'd go the old-fashioned way, step-up line transformer, then >> rectify. >> >> The I'd use... are you ready for this... vacuum tubes ... > > >Ye olde 6KD6 would be a candidate here: > >http://www.nj7p.org/Tube4.php?tube=6KD6 > > >> ... ("valves" on the other side of the pond) for the amplifiers. >> > >Or "lampes" where Fred lives :-) > > >> Everyone always wants exotic (and failure prone). >> > >Nah, done it transistorized, many times. What are you afraid of could go >wrong? > >Under five bucks, meaning even less than a Russian tube: > >http://ixdev.ixys.com/DataSheet/99036.pdf Short a tube, get a flash... no damage. Now do that to a semiconductor ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | You can never be too prepared for the REPRESSION!
From: Joerg on 4 Dec 2009 11:57 Jim Thompson wrote: > On Thu, 03 Dec 2009 14:59:49 -0800, Joerg <invalid(a)invalid.invalid> > wrote: > >> Jim Thompson wrote: >>> On Mon, 30 Nov 2009 23:33:30 +0100, "@@@Klaus@@@" >>> <klaus_my(a)hotmail.com> wrote: >>> >>>> Hello to everybody! >>>> It is the first time I write here and I apoligize for my poor >>>> english. >>>> I am working on an amplifier for driving piezo stacks and I >>>> need a sinusoidal voltage of 500 V peak with mean value of 500 >>>> V. To keep things "quite simple" I'll work at slow frequencies, >>>> so that the current in the stack (capacitance of 1 uF) is >>>> "reasonable", say it max 0f 50 mA. As a first attempt, I am >>>> evaluating the circuit proposed in AoE p. 169, which has been >>>> suggested in this ng in the past for similar applications. >>>> This amplifier (or other equivalent designs) employs a 1kV >>>> power supply for the power mos, so my question is: how can I >>>> realize 1 kV power supply for this kind af amplifier (actually >>>> I need 3 amplifiers)?Rising transformers?Multiplying >>>> circuits(diodes+caps)? >>>> >>>> Thanks for your advices, >>>> >>>> K. >>> Me? I'd go the old-fashioned way, step-up line transformer, then >>> rectify. >>> >>> The I'd use... are you ready for this... vacuum tubes ... >> >> Ye olde 6KD6 would be a candidate here: >> >> http://www.nj7p.org/Tube4.php?tube=6KD6 >> >> >>> ... ("valves" on the other side of the pond) for the amplifiers. >>> >> Or "lampes" where Fred lives :-) >> >> >>> Everyone always wants exotic (and failure prone). >>> >> Nah, done it transistorized, many times. What are you afraid of could go >> wrong? >> >> Under five bucks, meaning even less than a Russian tube: >> >> http://ixdev.ixys.com/DataSheet/99036.pdf > > Short a tube, get a flash... no damage. Now do that to a > semiconductor ;-) > Thou shalt not build a contraption this is not protected against the evil forces of a pipe wrench falling onto the output terminals :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Robert Latest on 6 Dec 2009 15:29 Joerg wrote: >> Short a tube, get a flash... no damage. Now do that to a >> semiconductor ;-) >> > > Thou shalt not build a contraption this is not protected against the > evil forces of a pipe wrench falling onto the output terminals :-) As long as the wrench falls onto the terminals but not onto the amp itself the tubes are fine I suppose... robert
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