Topic: DC/DC components.

[iriewsp]

Im looking for something that will take a DC input from a battery to a 48v DC ouput and another one that will do Battery to 25.5v DC.

Anyone know where I could find somthing like this, or find a place where I could get a DIY kit?

Thanks for the help.
Mike

[beathydrolysis]

Here's one to get you up to 48 v

http://abp.com/Up_Power_DC-DC_Converter.shtml

but I read your other post and honestly I think if you'll have to DIY to get the 25.5 v so ultimately it'd be better to do a DIY 12 v with 25.5 and 48 v output to your pre.  Having said that I think it will be a lot of trouble to do this so IMHO you're actually best off just spending the cash to get a preamp which is easy to use in the field.

[guysonic]

Here's one to get you up to 48 v

http://abp.com/Up_Power_DC-DC_Converter.shtml

but I read your other post and honestly I think if you'll have to DIY to get the 25.5 v so ultimately it'd be better to do a DIY 12 v with 25.5 and 48 v output to your pre.  Having said that I think it will be a lot of trouble to do this so IMHO you're actually best off just spending the cash to get a preamp which is easy to use in the field.

Getting the switching NOISE out of the regulater so as not to contaminate the audio is difficult technical feat!

[iriewsp]

Here's one to get you up to 48 v

http://abp.com/Up_Power_DC-DC_Converter.shtml

but I read your other post and honestly I think if you'll have to DIY to get the 25.5 v so ultimately it'd be better to do a DIY 12 v with 25.5 and 48 v output to your pre.  Having said that I think it will be a lot of trouble to do this so IMHO you're actually best off just spending the cash to get a preamp which is easy to use in the field.

Getting the switching NOISE out of the regulater so as not to contaminate the audio is difficult technical feat!

Well,  thanks for the input.   Basically what I was trying to do was this.  keep the AC/DC power supply in the pre, and wire the pre up to accept an external DC/DC power supply and useing a switch to delegate wich power supply I will be using.  Therefore I can use the wall plug while in the Studio where I will be using the pre the most.  And then when I do use it in the field I can use the external DC/DC power supply.  So is that not possible?  I dont know much about power so Im a bit confused.

[guysonic]

Here's one to get you up to 48 v

http://abp.com/Up_Power_DC-DC_Converter.shtml

but I read your other post and honestly I think if you'll have to DIY to get the 25.5 v so ultimately it'd be better to do a DIY 12 v with 25.5 and 48 v output to your pre.  Having said that I think it will be a lot of trouble to do this so IMHO you're actually best off just spending the cash to get a preamp which is easy to use in the field.

Getting the switching NOISE out of the regulater so as not to contaminate the audio is difficult technical feat!

Well,  thanks for the input.   Basically what I was trying to do was this.  keep the AC/DC power supply in the pre, and wire the pre up to accept an external DC/DC power supply and useing a switch to delegate wich power supply I will be using.  Therefore I can use the wall plug while in the Studio where I will be using the pre the most.  And then when I do use it in the field I can use the external DC/DC power supply.  So is that not possible?  I dont know much about power so Im a bit confused.

Clarification on your intentions to supply two internal sources of DC power helps define scope of the task. 

At this point, suggest NOT attempting this as switching supplies are inherently noise-toxic to low level audio processing.  Even the technically expert find this area challenging to implement in good manner. 

Your best solution for field work is as suggested before, to purchase a different pre with external 10-18 volt DC input feature and with performance/features that meet your requirements.  This is the ONLY practical way for most of us to avoid DC power conversion trashed audio.

[beathydrolysis]

well put guysonic

[dnsacks]

The other option would be to simply build a 48v battery (8x 6v sla batteries) a-la the oade m148.  If the 25.5v can be met @ closer to 24v, you could   tap that out of a split from 4 cells of the 48v battery pack.

the m148 uses 1/2ah 6volt cells which are fairly small and light and would provide VERY clean power.

[iriewsp]

So this is what I came up with.  Im not shure it will work, so let me know if it wont.

2 X 9.6V and 1 X 6V combined to make one 25.2v battery.

And 8 X 6V combined to make one 48v battery.

I was thinking about useing RC battery packs for this.

Question one is,  Will this work?   I would think that the only way to do this would be in series? 
Question two is, Will this be a clean power source?

Thanks for all the help guys. 

Mike