Power supply voltage limiter

skogs · 25th October 2009, 03:43 PM

Hi! I have a power supply that delivers +-38V. The problem is that the amplifier im using it for is rated +-36V max. So, could i use diodes to limit the voltage on the PS? And how?

Thanks.

star882 · 25th October 2009, 04:55 PM

Modify the voltage regulation to output a lower voltage.

skogs · 26th October 2009, 07:54 AM

Its really the transformer that delivers too high voltage, are you sure i can drop the voltage modifying the rectifier-stage?

star882 · 26th October 2009, 02:01 PM

Add a voltage regulator, then. Or add an autotransformer to step down the input a little bit.

skogs · 29th October 2009, 12:32 PM

If you could send me a link to the components you are refering to, that would be really great!

udailey · 6th November 2009, 05:18 PM

You could use an LM338 for instance, but remember you must be able to drop the full current. If you are going for 36V probably you run the risk of large current and then the voltage regulators that could handle it get expensive.
Another thing you can do is to add series resistance to get a voltage drop in your PSU.
Uriah

25th October 2009, 03:43 PM	#1
skogs diyAudio Member Join Date: Oct 2006	Power supply voltage limiter Hi! I have a power supply that delivers +-38V. The problem is that the amplifier im using it for is rated +-36V max. So, could i use diodes to limit the voltage on the PS? And how? Thanks.

25th October 2009, 04:55 PM	#2
star882 diyAudio Member Join Date: Mar 2007	Modify the voltage regulation to output a lower voltage. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

26th October 2009, 02:01 PM	#4
star882 diyAudio Member Join Date: Mar 2007	Add a voltage regulator, then. Or add an autotransformer to step down the input a little bit. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

6th November 2009, 05:18 PM	#6
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	You could use an LM338 for instance, but remember you must be able to drop the full current. If you are going for 36V probably you run the risk of large current and then the voltage regulators that could handle it get expensive. Another thing you can do is to add series resistance to get a voltage drop in your PSU. Uriah __________________ You can purchase LDRs anytime to build a standard LDR attenuator or to build my new LDR Attenuator "A Lighter Note". Email me. diyldr@gmail.com

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26th October 2009, 07:54 AM	#3
skogs diyAudio Member Join Date: Oct 2006	Its really the transformer that delivers too high voltage, are you sure i can drop the voltage modifying the rectifier-stage?

29th October 2009, 12:32 PM	#5
skogs diyAudio Member Join Date: Oct 2006	If you could send me a link to the components you are refering to, that would be really great!

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