Transformer Question

PassFan · 8th November 2003, 01:41 AM

I have a couple of 370 volt transformers and need 300volts for the circuit. Can I load these 370v's down to 300v's, and how?

Colt45 · 8th November 2003, 03:06 AM

resistors and/or regulators.

2 0D3's with a pass tube or transistor on top would probably be the best.

Sch3mat1c · 8th November 2003, 05:05 AM

370VAC? Choke input, maybe with tube rectifier.

Tim

li_gangyi · 8th November 2003, 05:31 AM

Most of the time though...the tube will probably do fine with a little voltage more...depends on the design as well...if it is already near the limits...

Brett · 8th November 2003, 06:12 AM

All of the above will work in lots of different configurations. But how about downloading PSUD2 from www.duncanamps.com and model it for yourself? The characteristics of the components in the PSU, eg a choke's DCR will affect the final voltage along with the current draw.

PassFan · 8th November 2003, 11:10 AM

Thanks for the tips guys. I actually have psud version 1 but wasn't having much luck with it. I will try out version 2. As far as regulation is concerned the cure must be significantly less than the 58 dollars for a new transformer so loading it down will be a better choice for me.

Happy Ears · 8th November 2003, 08:26 PM

Quote:

Originally posted by PassFan
I have a couple of 370 volt transformers and need 300volts for the circuit. Can I load these 370v's down to 300v's, and how?

Hi PassFan , what circuit have you got in mind ?

Happy Ears

li_gangyi · 8th November 2003, 11:11 PM

Yeah..if you passed us the circuit...maybe we could determine that you don't even have to drop the voltage at all~!!!

thomasholley · 9th November 2003, 02:49 AM

370V rectified is going to go upwards to 400-450VDC dependeng on how you rectify it and dropping voltage down to 300 is quite a stretch. You would probably be better off by reevaluating your circuit and either making allowances for higher voltage or getting a different transformer.

li_gangyi · 9th November 2003, 05:21 AM

it might drop a bit if you use a tube rectifier...

8th November 2003, 01:41 AM	#1
PassFan diyAudio Member Join Date: Aug 2001 Location: Central FL	Transformer Question I have a couple of 370 volt transformers and need 300volts for the circuit. Can I load these 370v's down to 300v's, and how?

8th November 2003, 05:05 AM	#3
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	370VAC? Choke input, maybe with tube rectifier. 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!"

8th November 2003, 05:31 AM	#4
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	Most of the time though...the tube will probably do fine with a little voltage more...depends on the design as well...if it is already near the limits... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

8th November 2003, 11:11 PM	#8
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	Yeah..if you passed us the circuit...maybe we could determine that you don't even have to drop the voltage at all~!!! __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

9th November 2003, 05:21 AM	#10
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	it might drop a bit if you use a tube rectifier... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

8th November 2003, 03:06 AM	#2
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	resistors and/or regulators. 2 0D3's with a pass tube or transistor on top would probably be the best.

8th November 2003, 06:12 AM	#5
Brett diyAudio Member Join Date: Jan 2002	All of the above will work in lots of different configurations. But how about downloading PSUD2 from www.duncanamps.com and model it for yourself? The characteristics of the components in the PSU, eg a choke's DCR will affect the final voltage along with the current draw.

8th November 2003, 11:10 AM	#6
PassFan diyAudio Member Join Date: Aug 2001 Location: Central FL	Thanks for the tips guys. I actually have psud version 1 but wasn't having much luck with it. I will try out version 2. As far as regulation is concerned the cure must be significantly less than the 58 dollars for a new transformer so loading it down will be a better choice for me.

9th November 2003, 02:49 AM	#9
thomasholley diyAudio Member Join Date: Nov 2003 Location: Ohio	370V rectified is going to go upwards to 400-450VDC dependeng on how you rectify it and dropping voltage down to 300 is quite a stretch. You would probably be better off by reevaluating your circuit and either making allowances for higher voltage or getting a different transformer.

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