Scalable PSU/regulator GB - Page 3

BobEllis · 18th March 2006, 06:46 PM

Hi Andrew,

I'll put another blank line in the wiki. In the future, you can just copy the line, paste twice then fill in your info using the top line.

I haven't looked into pricing since the beginning. I figure we should wait for the design to stabilize. The usual breaks are around 50 pieces apart, though.

Bob

infinia · 18th March 2006, 07:00 PM

Hi

1) What are the baseline part values for 15V 1A load step design.

2) Recommended XFMR for 15V 1A (standard part if possible)

3) will the design work for 12V 1A ex for changing 1 resistor?

Thanks

BobEllis · 18th March 2006, 08:49 PM

Since we don't yet have a final design, 15V part values are not defined. One design goal is to make voltage changes as simple as changing a resistor or two.

I'm working on buying a large number of Avel dual 15V 50VA transformers which should be suitable for most crossover needs (one will handle 4 fully stuffed filter boards without using half of its VA rating).

If you want to provide an amp continuously, you ought go up a bit to give your transformer some wiggle room, say 100VA. You can use anything with enough AC voltage to cover the filter and regulator losses. I figure with 15VAC, we'll have about 6V to cover diode drops, CRC losses and still give the regulator a bit of room to work while giving us 15V out. You'll need to adjust the R in the CRC to balance ripple, voltage loss and power dissipation in the R and regulator. I guess I'll need to write up another set of instructions.

cotdt · 18th March 2006, 09:28 PM

Cool, I'm interested in the kit. Should be useful to power amps and crossovers.

infinia · 19th March 2006, 12:25 AM

I just thought the design had baseline values since Jens had published step load performance.
Interested in starting the analysis of this design before I decided to sign up.

I'm thinking of running the 3 xover boards at 12Vdc. No reason to run them higher than that and wasting power/heat.

BobEllis · 19th March 2006, 12:53 AM

Jens changed the topology since publishing the step response.

Fear not, once the design is stable, we'll publish values.

kro5998 · 19th March 2006, 01:12 AM

I have some 2 x 14Vac 1 Amp transformers laying around that i will use.1 Amp, should be more then enough for 2 boards.

Per, there is no need for a super regulator since the most used Opamps have a pssr of over 100 db. theoretically just a rectifier and a cap will do just fine.

kro5998

BobEllis · 19th March 2006, 01:25 AM

Kro -

No we're not planning to go nuts with this. We're (Jens is doing the heavy lifting) trying to come up with a regulator that can be used for more than 15V opamp circuits and still be reasonably easy and inexpensive to build . Thinking of things like powering the front end of an amp or a discrete preamp.

infinia · 19th March 2006, 01:58 AM

Hi
Look at using zeners in the range 4 - 6 Volts for lowest noise.
might have to add a trim pot to eliminate high precision zeners and voltage setting resistors. Maybe a red LED instead of zener.

kro5998 · 19th March 2006, 02:15 AM

Bob. I didn't intend to offend anybody but i think a lot of us just need a good PSU for the filter.

kro5998

18th March 2006, 07:00 PM	#22
infinia diyAudio Member Join Date: May 2005 Location: Californication	Hi 1) What are the baseline part values for 15V 1A load step design. 2) Recommended XFMR for 15V 1A (standard part if possible) 3) will the design work for 12V 1A ex for changing 1 resistor? Thanks __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

19th March 2006, 12:25 AM	#25
infinia diyAudio Member Join Date: May 2005 Location: Californication	I just thought the design had baseline values since Jens had published step load performance. Interested in starting the analysis of this design before I decided to sign up. I'm thinking of running the 3 xover boards at 12Vdc. No reason to run them higher than that and wasting power/heat. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

19th March 2006, 01:58 AM	#29
infinia diyAudio Member Join Date: May 2005 Location: Californication	Hi Look at using zeners in the range 4 - 6 Volts for lowest noise. might have to add a trim pot to eliminate high precision zeners and voltage setting resistors. Maybe a red LED instead of zener. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

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18th March 2006, 06:46 PM	#21
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Hi Andrew, I'll put another blank line in the wiki. In the future, you can just copy the line, paste twice then fill in your info using the top line. I haven't looked into pricing since the beginning. I figure we should wait for the design to stabilize. The usual breaks are around 50 pieces apart, though. Bob

18th March 2006, 08:49 PM	#23
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Since we don't yet have a final design, 15V part values are not defined. One design goal is to make voltage changes as simple as changing a resistor or two. I'm working on buying a large number of Avel dual 15V 50VA transformers which should be suitable for most crossover needs (one will handle 4 fully stuffed filter boards without using half of its VA rating). If you want to provide an amp continuously, you ought go up a bit to give your transformer some wiggle room, say 100VA. You can use anything with enough AC voltage to cover the filter and regulator losses. I figure with 15VAC, we'll have about 6V to cover diode drops, CRC losses and still give the regulator a bit of room to work while giving us 15V out. You'll need to adjust the R in the CRC to balance ripple, voltage loss and power dissipation in the R and regulator. I guess I'll need to write up another set of instructions.

18th March 2006, 09:28 PM	#24
cotdt diyAudio Member Join Date: Oct 2005	Cool, I'm interested in the kit. Should be useful to power amps and crossovers.

19th March 2006, 12:53 AM	#26
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Jens changed the topology since publishing the step response. Fear not, once the design is stable, we'll publish values.

19th March 2006, 01:12 AM	#27
kro5998 diyAudio Member Join Date: Dec 2004 Location: Tilburg	I have some 2 x 14Vac 1 Amp transformers laying around that i will use.1 Amp, should be more then enough for 2 boards. Per, there is no need for a super regulator since the most used Opamps have a pssr of over 100 db. theoretically just a rectifier and a cap will do just fine. kro5998

19th March 2006, 01:25 AM	#28
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Kro - No we're not planning to go nuts with this. We're (Jens is doing the heavy lifting) trying to come up with a regulator that can be used for more than 15V opamp circuits and still be reasonably easy and inexpensive to build . Thinking of things like powering the front end of an amp or a discrete preamp.

19th March 2006, 02:15 AM	#30
kro5998 diyAudio Member Join Date: Dec 2004 Location: Tilburg	Bob. I didn't intend to offend anybody but i think a lot of us just need a good PSU for the filter. kro5998

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