*** 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-supplies/51817-improving-capacitance-multiplier.html
http://www.diyaudio.com/forums/power-supplies/53359-finished-capacitance-multiplier.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:
Schematic and BOM in PDF form are attached. Links to a Mouser BOM are below:
Key Components: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=2f2cddc696
Miscellaneous Components: https://www.mouser.com/ProjectManag...jectGUID=44bfeb06-a22a-4041-b761-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.
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-supplies/51817-improving-capacitance-multiplier.html
http://www.diyaudio.com/forums/power-supplies/53359-finished-capacitance-multiplier.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
Schematic and BOM in PDF form are attached. Links to a Mouser BOM are below:
Key Components: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=2f2cddc696
Miscellaneous Components: https://www.mouser.com/ProjectManag...jectGUID=44bfeb06-a22a-4041-b761-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.
Attachments
Last edited:
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)
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)
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.
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'
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'
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
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
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.
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
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
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 ?
Is anyone able to help me on this ?
No, sorry I was not more clear.
First - Everyone on the list above will be supplied boards.
(some of those people have waited for me to get this done for 4 weeks!)
For my own convenience, as well as prompt shipment for the first few people, the GB was split into several orders. First batch of boards has been shipped out. Second one is arriving today. And will start shipping on Friday.
I have already promised one more order, so anyone at the end of the list, or who adds their name in the near future will be included. Since I am doing this in my spare time (and I have open requests for nx-Amp and through hole VSSA/PeeCeeBee), each step can take a day... 🙁
Yes, thanks, but I need to keep that uncluttered for documentation, build instructions, etc. I do keep a separate list (or try to).
Yes, the board is designed for this already. There are two sets of connectors on the sides, for unregulated DC input, or output (output to another board used at lower power, with separate filter) Not fully tested, but included in the design. For this, C11 and C12 are not optional without a bit of hf suppression, you have a potential antenna here)
The connection points are labeled DC+ and DC-, and located just ahead of and adjacent to the fuse holder. The connector, C11/C12, and fuse holder are in close proximity on the edge of the board.
Idefixes can do that, and has examples already posted in the other thread. In fact, we are trying to encourage and support that from the beginning, going back to the PeeCeeBee thread, and in the spirit and following Shaan's example.
Unfortunately, my layout is not as suitable in that regard as Marc's (Idefixes). When he returns from vacation, I shall tackle that again w. his help, however, he has already invested a bit of time in this, so using his version as is may be best for etching at home.
Hi Peter, how much is shipping of 4 boards to Australia?. Just a flat pad envelop, nothing fancy.
Quan
Quan
The first post has been updated to show cost including shipping for as many combinations as I had time to look up on the US Post Office web site. The total cost is based on the number of boards, ~1.2 oz per board weight, padded envelope, and 3.9%+$0.30 Paypal Fee.
