Low Voltage amp driving a esl

willyhoho · 18th January 2007, 08:34 PM

Is there any way a low output amp (100w/ch) almost 4volt cranked can
drive a esl? Esl is 16"x28" with .062 spacing.

ak_47_boy · 19th January 2007, 10:02 PM

I think you would have to add on a stepup transformer. I think a output transformer backwards would get you up to around 40 volts, then the quads can take it from there. The problem with steping up from such a low voltage is the capacitance gets really high. I dont know if the amp would oscillate or not.

willyhoho · 21st January 2007, 08:34 PM

I have a 50/1 trannie in the circuit along with a bias supply. I am afraid
to hook it all up to my Sony amp. I think it would take a channel out.
What kind of exciting current will the amp see? See what you get into
when you want to hear a good sound!!

I_Forgot · 21st January 2007, 09:01 PM

A 100W/ch amplifier puts out MUCH more than 4V.

Power = (V^2)/R

100W into 8 Ohms requires 28V rms. Your 50:1 xfmr will give 1414 Vrms out, plenty to drive an ESL.

The amp should be OK when you hook it to the transformer because the transformer isolates the amp from the HV. You can help ensure stability by connecting a resistor of about 1 Ohm or so in series between the amp and the transformer.

Be careful. The output side of the transformer can hurt you badly.

I_F

ak_47_boy · 21st January 2007, 10:02 PM

That would require a 100W power resistor correct?

willyhoho · 21st January 2007, 11:12 PM

I think a 10-20 watt would do the trick. Thanks everyone for the replies .I will keep you posted.

18th January 2007, 08:34 PM	#1
willyhoho diyAudio Member Join Date: Nov 2005	Low Voltage amp driving a esl Is there any way a low output amp (100w/ch) almost 4volt cranked can drive a esl? Esl is 16"x28" with .062 spacing.

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19th January 2007, 10:02 PM	#2
ak_47_boy diyAudio Member Join Date: Sep 2006	I think you would have to add on a stepup transformer. I think a output transformer backwards would get you up to around 40 volts, then the quads can take it from there. The problem with steping up from such a low voltage is the capacitance gets really high. I dont know if the amp would oscillate or not.

21st January 2007, 08:34 PM	#3
willyhoho diyAudio Member Join Date: Nov 2005	I have a 50/1 trannie in the circuit along with a bias supply. I am afraid to hook it all up to my Sony amp. I think it would take a channel out. What kind of exciting current will the amp see? See what you get into when you want to hear a good sound!!

21st January 2007, 09:01 PM	#4
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	A 100W/ch amplifier puts out MUCH more than 4V. Power = (V^2)/R 100W into 8 Ohms requires 28V rms. Your 50:1 xfmr will give 1414 Vrms out, plenty to drive an ESL. The amp should be OK when you hook it to the transformer because the transformer isolates the amp from the HV. You can help ensure stability by connecting a resistor of about 1 Ohm or so in series between the amp and the transformer. Be careful. The output side of the transformer can hurt you badly. I_F

21st January 2007, 10:02 PM	#5
ak_47_boy diyAudio Member Join Date: Sep 2006	That would require a 100W power resistor correct?

21st January 2007, 11:12 PM	#6
willyhoho diyAudio Member Join Date: Nov 2005	I think a 10-20 watt would do the trick. Thanks everyone for the replies .I will keep you posted.

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