To those using the DVR134...

[cdoggy81]

...what are you powering it with?

How good does the power supply have to be? I would like for it to be as simple as possible (fully utilizing the K.I.S.S. principal ) & don't really want to mess with all that fun stuff for it. I was thinking one of these options:

1. 2 x 9v batteries
2. Parts Express 120-040 or 120-045 ($3)
3. Parts Express 120-1120 ($9)
4. Parts Express 120-1085 ($16) regulated

Thanks & let me know what you all think.

[tiroth]

You need a bipolar supply. The batteries will work great, but it gets expensive.

None of the adaptors are suitable. You should use an AC, not DC, adapter as Rod Elliot does in his preamp supply.

http://www.sound.westhost.com

[cdoggy81]

Thanks tiroth.

How long do you think those batteries would last? IIRC the DVR doesn't pull that much current.

I thought the output of the adaptors were DC?

Which pre amp were you looking at?

[pinkmouse]

What are you using the DRV for? If it's line driving, they pull a fair amount of current. I never used them with batteries, but with a normal +-15v supply they need good bypassing, 100uf and 0.1uf on each rail.

[tiroth]

Let's put it this way, I wouldn't choose 9V batteries.

Rod's design is probably one of the best possible for a novice constructor, and last time I ordered PE had some nice low-power AC wall warts.

[cdoggy81]

Ok so batteries are out.
What about this regulated 12VDC 800MA unit with 100uf and 0.1uf on each rail?

http://www.partsexpress.com/pe/showd...umber=120-1085

[cdoggy81]

Anyone???

[tiroth]

l told you above that it won't work. Check out Rod's site for a cheap PSU that can be powered by an AC (not DC) wall wart.

[lgreen]

I've done it with batteries, look at this link, there is a schematic there as well.

Also, you could use a super low noise power supply, I built one on the other end of the circuit (the INA134), a schematic is posted on the bottom of this page, as well as a picture of the board I built. This design was great, the noise floor was at the limit of my scope.

Good luck, you will find that you don't need a very powerful regulator to run these types of chips. Both battery and a small transformer work fine.

[cdoggy81]

tiroth,
I understand that you say it won't work but why? ( give a man a fish vs. teach a man to fish )
Is the output to low?
Should it not be regulated??
Is 800MA to little???

lgreen,
Thanks for the info. I may just use a small transformer & one of Brian GT's old LM3785 power supply PCBs with MUR860's & a panisonic 47uF cap. BTW, how much current do you think I will need to supply the DVR134 to bridge 4 3886 chips? LMK what you think.