4 caps Mr Evil's Capacitance Multiplier Power Supply PCB

[yoaudio]

First Watt

 

[Juntuin]

FW ?

First Watt

 

[Juntuin]

Well, I'll take two and test how they roll;

Earthquake /UK / 4 boards
arthur / HK / 8 boards
markus22ch /Swiss / 4 boards
KVP / Belgium / 4 boards
vasillis / Greece : 4 boards
odie1472 :Brunie / 4 boards
Mindfunk / Germany/ 4 boards
nautibuoy/UK/4 boards
Wot4Pilot/UK/2 boards
aspringv/Australia/2 boards
jacques antoine/France/2 boards
yoaudio/USA/6 boards
Johnny2Bad/ 2 boards
kaliwraith/USA/2 boards
shattered_dream /germany/2 boards
JimS/USA/ 3 boards
Juntuin/Finland/2 pcb's

Total: 61

 

[meanman1964]

Would you like it in style like this ?

 

[Juntuin]

Hmm, I don't quite follow now that cap multiplier shown in page one with 6 caps, mr Evil's.

 

[meanman1964]

I mean the inplanting of the rectifier diodes and the use of bigger ones this way.

 

[mcgillroy]

Would this be feasible in a power-supply for the B1 Korg Triode PCB? If so I'd take two too plz.

 

[Luke]

For class A bias, the rectifiers get very hot, they need adequate heatsinking.

 

[schillg11]

For a class A bias, it's better to use a Cap-Multiplier, where the rectifiers and the powertransistors are mounted under the PCB, in direct contact to the big heatsink. From power dissipation it should be possible to use this Capmu for A/B power amps lessor equal 100W.

 

[jameshillj]

A few figures will make the heatsink size clearer.

A First Watt amp, for example, will be biased approx at 1.5A per channel and if using one C-Mx per channel, this means it passes the same 1.5A per device (for each '+' and '-' rail) and for the IRFP devices, they drop about 4.5 v across each device and this generates 4.5 x 1.5 = 6.75 watts of heat to dissipate into a heatsink. [this means an added 13.5 watts dissipation for both channels - 2 x C-Mx for this type of amp]

If you want to restrict that heatsink temp to about a 15*C temp rise (pretty conservative), you simply divide the 15 by the 6.75 that gives here 2.2*C/W (degrees centigrade per watt) and this is how the heatsinks are rated - just look up this in any of the heatsink tables

So for 2 fets for each C-Mx in this example, the single heatsink needs to be rated at 1.1*C/W for the two fets - just look this up on the Mouser/Digikey/etc site for the size/cost.

From use over the years, you can run these IRFP fets to well over the usual 45*C transistor body/heatsink temp on a typical 25*C room temp day

... my 2 cents

 

[md_Stryker]

Earthquake /UK / 4 boards
arthur / HK / 8 boards
markus22ch /Swiss / 4 boards
KVP / Belgium / 4 boards
vasillis / Greece : 4 boards
odie1472 :Brunie / 4 boards
Mindfunk / Germany/ 4 boards
nautibuoy/UK/4 boards
Wot4Pilot/UK/2 boards
aspringv/Australia/2 boards
jacques antoine/France/2 boards
yoaudio/USA/6 boards
Johnny2Bad/ 2 boards
kaliwraith/USA/2 boards
shattered_dream /germany/2 boards
JimS/USA/ 3 boards
Juntuin/Finland/2 pcb's
MD_Stryker/USA/ 2 boards

Total: 63

 

[Emynet]

Earthquake /UK / 4 boards
arthur / HK / 8 boards
markus22ch /Swiss / 4 boards
KVP / Belgium / 4 boards
vasillis / Greece : 4 boards
odie1472 :Brunie / 4 boards
Mindfunk / Germany/ 4 boards
nautibuoy/UK/4 boards
Wot4Pilot/UK/2 boards
aspringv/Australia/2 boards
jacques antoine/France/2 boards
yoaudio/USA/6 boards
Johnny2Bad/ 2 boards
kaliwraith/USA/2 boards
shattered_dream /germany/2 boards
JimS/USA/ 3 boards
Juntuin/Finland/2 pcb's
MD_Stryker/USA/ 2 boards
emynet/Italy/ 2 boards

Total: 65

 

[vitalica]

Cutremur / Marea Britanie / 4 placi
arthur / HK / 8 placi
markus22ch / Swiss / 4 placi
KVP / Belgia / 4 placi
Vasillis / Grecia: 4 placi
odie1472: Brunie / 4 placi
Mindfunk / Germania / 4 placi
nautibuoy / UK / 4 placi
Wot4Pilot / UK / 2 placi
aspringv / Australia / 2 placi
jacques antoine / Franta / 2 placi
yoaudio / SUA / 6 placi
Johnny2Bad / 2 placi
kaliwraith / SUA / 2 placi
shattered_dream / Germania / 2 placi
JimS / USA / 3 placi
Juntuin / Finlanda / 2 PCB's
MD_Stryker / SUA / 2 placi
emynet / Italia / 2 placi
vitalica / 4 placi

Total: 69

 

[dabore84]

Earthquake /UK / 4 boards
arthur / HK / 8 boards
markus22ch /Swiss / 4 boards
KVP / Belgium / 4 boards
vasillis / Greece : 4 boards
odie1472 :Brunie / 4 boards
Mindfunk / Germany/ 4 boards
nautibuoy/UK/4 boards
Wot4Pilot/UK/2 boards
aspringv/Australia/2 boards
jacques antoine/France/2 boards
yoaudio/USA/6 boards
Johnny2Bad/ 2 boards
kaliwraith/USA/2 boards
shattered_dream /germany/2 boards
JimS/USA/ 3 boards
Juntuin/Finland/2 pcb's
MD_Stryker/USA/ 2 boards
emynet/Italy/ 2 boards
vitalica / 4 boards
dabore84 / NL / 2 boards

Total: 71

 

[Ian Greenhalgh]

I'd like 4 of these if possible.

 

[gary s]

Earthquake /UK / 4 boards
arthur / HK / 8 boards
markus22ch /Swiss / 4 boards
KVP / Belgium / 4 boards
vasillis / Greece : 4 boards
odie1472 :Brunie / 4 boards
Mindfunk / Germany/ 4 boards
nautibuoy/UK/4 boards
Wot4Pilot/UK/2 boards
aspringv/Australia/2 boards
jacques antoine/France/2 boards
yoaudio/USA/6 boards
Johnny2Bad/ 2 boards
kaliwraith/USA/2 boards
shattered_dream /germany/2 boards
JimS/USA/ 3 boards
Juntuin/Finland/2 pcb's
MD_Stryker/USA/ 2 boards
emynet/Italy/ 2 boards
vitalica / 4 boards
dabore84 / NL / 2 boards
gary s / Australia / 2 boards

Total: 73

Where is this GB up to with regards a final PCB design and anticipated delivery?

 

[gary s]

Earthquake /UK / 4 boards
arthur / HK / 8 boards
markus22ch /Swiss / 4 boards
KVP / Belgium / 4 boards
vasillis / Greece : 4 boards
odie1472 :Brunie / 4 boards
Mindfunk / Germany/ 4 boards
nautibuoy/UK/4 boards
Wot4Pilot/UK/2 boards
aspringv/Australia/2 boards
jacques antoine/France/2 boards
yoaudio/USA/6 boards
Johnny2Bad/ 2 boards
kaliwraith/USA/2 boards
shattered_dream /germany/2 boards
JimS/USA/ 3 boards
Juntuin/Finland/2 pcb's
MD_Stryker/USA/ 2 boards
emynet/Italy/ 2 boards
vitalica / 4 boards
dabore84 / NL / 2 boards
gary s / Australia / 2 boards
Ian Greenhalgh / UK / 4 boards

Total: 75

Ian, I took the liberty to add your name to the list while adding mine - not sure where it is up to.

 

[gary s]

Meanman,

Can I ask if you have an up to date schematic, BOM and stuffing guide for the PCB design as it stands at the moment. Also is the PCB design final yet, as it is not clear reading the thread where you are up to with the GB totalling 75 PCB's.

Any anticipated pricing available at this stage?

Regards,

Gary..

 

[Ian Greenhalgh]

Cheers Gary.

 

[gary s]

No response from meanman 1964 - the thread starter since 27th December 2018!

I think this GB thread maybe dead.