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-   -   Mr Evil's Capacitance Multiplier Power Supply PCB (http://www.diyaudio.com/forums/group-buys/241131-mr-evils-capacitance-multiplier-power-supply-pcb.html)

PMI 21st August 2013 03:12 AM

Mr Evil's Capacitance Multiplier Power Supply PCB
 
8 Attachment(s)
*** November 9, 2013 - A new GB list has been started ***

Please see post #171 for an update.

If you are reading this thread for the first time, please DO visit at least the second link below. If you are interested in the boards, please post a one-line request. I have planned to make at least one small order in the next 2-3 weeks, so there does not have to be any minimum number of boards for a group buy, but it will be first-come-first-serve.

http://www.diyaudio.com/forums/power...ultiplier.html
http://www.diyaudio.com/forums/power...ultiplier.html

My thanks to Mr Evil for letting us use his thread to get the PCB off the ground and into production. The board in the pics below was designed from his schematic, with some minor modifications and options and for higher supply voltage than the original. My original goal was to use this PSU with Lazy Cat's VSSA as an alternative to switching supplies, and with through hole VSSA boards (see pics below).

The operating range is up to +/-50V output voltage, 5A peak current. The semiconductors and caps specified in the power supply are selected for up to 100W/channel, class A-B operation. This is not the maximum possible, but it is the limit for the components listed in the revision B BOM. The rectifier diodes and the large electrolytic capacitors should be selected for the intended use - there is no single formula that covers every possible application. Higher supply voltages require some component substitutions.

Key Features:
  • Soft turn-on (to reduce amp turn-on thump and other audible noise)
  • Adjustabe Dropout Voltage (for low and medium power applications)
  • Higher efficiency than typical Capacitance Multiplier
  • Lower noise than most Capacitance Multipliers (under 20mV, tested)
  • Moderate component cost (under $25 plus cost of electrolytic caps)
  • Capacity for 100 watt/channel Class A-B power amplifier
Documentation:

Schematic and BOM in PDF form are attached. Links to a Mouser BOM are below:

Key Components: https://www.mouser.com/ProjectManage...sID=2f2cddc696
Miscellaneous Components: https://www.mouser.com/ProjectManage...1-bd9d71be3daf

I will post additional details and documentation as time allows, but there are already technical details and test results in the two threads referenced above. Posts specific to this board start here:

PCB discussion, testing, components, heatsinks, etc.

The PCB is in revision B. The boards are professionally fabricated, two layer, top and bottom solder mask, top silkscreen, plated holes.

Costs (Updated 22. August):

PCB, $10 each, plus shipping and Paypal fees.
Each board ships with two Jfets and two 3-mm LED's at no extra charge.

Typical cost incl. boards, padded envelope, shipping, and Paypal fee has been as follows:

US Domestic First Class, Large Envelope:

1 board: $13.50
2 boards: $23.75
3 boards: $34.50
4 boards: $45.25
6 boards: $66.75

Canada:

1 board $13.75
2 boards: $24.25
3 boards: $35.00
4 boards: $45.75
6 boards: $67.00

Europe and International:

1 board: $14.25
2 boards: $25.50
3 boards: $37.75
4 boards: $49.00
6 boards: $71.75

If requesting shipping via USPS International Parcel as merchandise, with customs declaration (and a very official looking label), please plan to add $6.50 to the cost above. In all other cases, boards are shipped by regular mail.

PMI 21st August 2013 03:49 AM

Updated List, as of 20. August
 
The following is the list of names signed up for boards, from Mr Evil's thread.
I believe this includes everyone who requested boards from the current order, which was split into a couple batches, increased and arriving in multiple shipments as explained earlier.

IvanLukic(4) paid, 4 hold for parts, 1 shipped
Freeman(2) 1 shipped, 2 hold
Idefixes(4) on vacation, hold
Touchdown(2) paid
vgeorge(2) shipped
Jameshillj(2) shipped
Jsixis(2) shipped
Praudio(4) shipped
Compressit(2) shipped
Cambe(2) shipped)
Gannaji(1) hold for parts
Potepuh(4) on vacation
Syklab(2)
quan(4)
tjencks(2)
BYRTT(4)
Ryssen(2)
rickmcinnis(3)
Joachim Gerhard(2)
still4given(2)
Rick G(2)
androa76(2)
fredlock(2)
stajo(4)
kimon(2)
SigFire (2)
vitalica(4)
dw1narso (2)
analog_sa(2)
buzzforb(2)
kindhornman (6) hold for September shipping
Luke(4)
pchw (4)
jj506 (4)
TheShaman (2)
Raj1 (6)
Ranchu32 (2)
Pinnocchio (2)

Ranchu32 21st August 2013 07:05 AM

Hi PMI, if you could kindly advise the total cost for my two boards, including shipping to Australia, I would be happy to transfer the funds.

tinitus 21st August 2013 08:27 AM

PMI

you can always edit your first post

this means that you may always have your own personal updated list in the first post

just a suggestion
I do not yet know if it will be 'practical'

tinitus 21st August 2013 08:28 AM

IvanLukic(4) paid, 4 hold for parts, 1 shipped
Freeman(2) 1 shipped, 2 hold
Idefixes(4) on vacation, hold
Touchdown(2) paid
vgeorge(2) shipped
Jameshillj(2) shipped
Jsixis(2) shipped
Praudio(4) shipped
Compressit(2) shipped
Cambe(2) shipped)
Gannaji(1) hold for parts
Potepuh(4) on vacation
Syklab(2)
quan(4)
tjencks(2)
BYRTT(4)
Ryssen(2)
rickmcinnis(3)
Joachim Gerhard(2)
still4given(2)
Rick G(2)
androa76(2)
fredlock(2)
stajo(4)
kimon(2)
SigFire (2)
vitalica(4)
dw1narso (2)
analog_sa(2)
buzzforb(2)
kindhornman (6) hold for September shipping
Luke(4)
pchw (4)
jj506 (4)
TheShaman (2)
Raj1 (6)
Ranchu32 (2)
Pinnocchio (2)
tinitus (2)


added my name to the list, with 2 boards

thanks

atupi 21st August 2013 12:44 PM

It's late to join the party with 2 boards ? Thanks!

PMI 21st August 2013 01:54 PM

Quote:

Originally Posted by atupi (Post 3603749)
It's late to join the party with 2 boards ? Thanks!

No, but your boards probably will not ship for a couple weeks. Hard to say, because there are usually some people who drop out before payment.

The current pcb order is oversubscribed by a few pieces, but I have already made commitments to a couple people to reorder.

tinitus 21st August 2013 02:23 PM

sounds like you are saying the GB is closed :confused:

baswamin 21st August 2013 02:38 PM

PMI,

I would be interested in 2 boards too. Saw this a bit too late. I am assuming you can feed DC voltage to this board and bypass the diode/input capacitor? I already have diodes/caps on another board.

Thanks

atupi 21st August 2013 03:01 PM

I would be happy to etch my boards if anybody can share a pdf in black and white.
Is anyone able to help me on this ?


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