---

[Quoting Prune]

How do I make a BOM? I used Eagle to make the board.

---

BOM is a "Bill of Materials", just a list of the components that you used, preferably where you got them and how much they cost as well.

[Edited by Prune on 12-07-2006 at 01:18 AM.]

[Edited by oldrocker on 12-27-2006 at 06:07 PM.]

* Looks like the Millet Hybrid PCB are sold out
* Alien DAC Group Buy is over

Thanks for maintaining this

[Edited by jcd on 03-08-2007 at 03:40 PM.]

[Edited by jcd on 03-08-2007 at 03:40 PM.]

[Edited by jcd on 03-08-2007 at 03:40 PM.]

[Edited by jessyhalm on 03-03-2007 at 03:39 AM.]

Shunt superregulator is discussed at this diyhifi thread. Schematic is on there, as well as here. Download for the CAD files is here. If you're modifying the layout, keep the 100 nF cap close to the opamp supply pin, and the largest 100 uF 35 V not too far. The error signal is taken from the output for obvious reasons. Poor layout will decrease performance of the shunt regulator. It's good to add a snubberized cap at the output, say 220 uF with 0.33 ohms, then un-snubberized cap at the load side (maybe bypassed with a film cap). If load does not draw constant current (not class A), omit these capacitors and have the regulator right by its load.

Notes about those Eagle files: one of the 100 uF 35 V capacitors is larger than the others. Why? Higher ripple current rating. The multiturn trimpot on the CCS is not surface mount like the one on the regulator, simply because I had the right value lying around. The diode and two power resistors in the CCS by this pot, making this differ from the original schematic, are there to decrease dissipation for the higher current I want available, so that the pot drops much less voltage. Make sure you adjust these parts for whatever maximum current you expect through it. A trimpot generally can't dissipate much power. Don't forget that the diode's forward drop is not constant but tends to be a good deal lower when running at a small fraction of its maximum current.
For specific part numbers, if you're building a copy (should be customizing really), I can probably check my previous digikey order, where I got most of the parts.

[Edited by Prune on 03-09-2007 at 01:37 AM.]

Thanks.

JCD

As for cost, it's not good to make just one since ordering surface mount parts at Digikey usually means you need to order five or ten at a time. I built four regulators, and for that, looking at my last Digikey order, I'd say about a dozen US dollars per regulator, roughly.

The majority of actual parts used are a subset of this Digikey order: http://cl1p.net/dgko/

Comment? Shunt regulators isolate the power supply and load AC current loops very well, and this particular design is well optimized.

http://www.mnen...tregulator.html

I have also a couple of regulators/power supplies. Every headphone amplifier of mine have power supplies on the board but my stand alone PS may also be of interest.

[Edited by peranders on 05-11-2007 at 05:04 PM.]

---

[Quoting Prune]

You should have an output impedance vs frequency graph. Generally a low ESR capacitor in the output will cause a resonance peak that is easy to miss in measuring just a few discrete frequencies. A simple passive network can remove any peaks (http://www.calex.com/pdf/3power_impedance.pdf)

Also, I hope you remembered on your PCB the output capacitor should be very close to the opamp supply pins.

Also, I hope you remembered on your PCB the output capacitor should be very close to the opamp supply pins.

JCD