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Old 17th December 2011, 09:18 PM   #3721
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Well,
u are.
Captain.
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Old 17th December 2011, 09:35 PM   #3722
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Talking Captain G

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Well,
u are.
Captain.
I second that !


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Old 17th December 2011, 09:48 PM   #3723
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Old 18th December 2011, 05:41 PM   #3724
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If this ones work it would be good. They are inexpensive :ZD 3,9 - Zener-Diode 1,3W 3,9V - Z-Dioden, 1,3W bei reichelt elektronik
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Old 18th December 2011, 07:03 PM   #3725
hesener is offline hesener  Germany
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Hi all,

layout work will start tomorrow, I am going with the schematic of post 3688 at this point - should be good enough for starting. I will be making place for 1/2W resistors, big input caps and some larger resistors where indicated. Plus, of course, the shunt regs.

Speaking of which - Frans could you give us an estimate of the power dissipation of the regulators, for choosing an appropriate heatsink?
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Old 18th December 2011, 07:32 PM   #3726
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by hesener View Post
Hi all,

layout work will start tomorrow, I am going with the schematic of post 3688 at this point - should be good enough for starting. I will be making place for 1/2W resistors, big input caps and some larger resistors where indicated. Plus, of course, the shunt regs.

Speaking of which - Frans could you give us an estimate of the power dissipation of the regulators, for choosing an appropriate heatsink?
These are the numbers:
D45H11/D44H11 1.7W
LM317/LM337 0.7W
IRF610/IRF9610 1.1W Under normal (105mA) load condition
IRF610/IRF9610 3.6W When preamp disconnected

This is for a 24Vac transformer, for every Vac rise on the transformer the power consumption of D45H11/D44H11 will rise with about 250mW.
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Old 18th December 2011, 07:39 PM   #3727
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Thanks Hesener and FdW, good start.
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Old 18th December 2011, 07:46 PM   #3728
hesener is offline hesener  Germany
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That was quick Frans, thanks a lot!! These numbers are not very high but high enough in my opinion to merit a good heatsink.

Three options:
- locating the power components on the edge, so they can be attached to an external heatsink
- (several smaller) heatsinks that can be soldered onto the PCB
- one larger heatsinks (e.g. 80mm) that goes across the PCB and all power components are attached (requires isolation pads)

opinions?
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Old 18th December 2011, 08:24 PM   #3729
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by hesener View Post
That was quick Frans, thanks a lot!! These numbers are not very high but high enough in my opinion to merit a good heatsink.

Three options:
- locating the power components on the edge, so they can be attached to an external heatsink
- (several smaller) heatsinks that can be soldered onto the PCB
- one larger heatsinks (e.g. 80mm) that goes across the PCB and all power components are attached (requires isolation pads)

opinions?
Shared heat sinks is best, option one or three. Option two is problematic due to the different wattages being dissipated, needing different sizes.

Option 1 or 3 needing heat sinking for about 6Watts.

This can be done on the PCB (6Watt), so I would go for option 3.

Under normal conditions (preamp connected) 3.5W is being dissipated. I would go for +20 degC (above environment) and that would need a 5 or 6 degC/Watt heat sink. That sets an (acceptable) temperature increment of about +30 degC when the preamp is not connected.

Last edited by FdW; 18th December 2011 at 08:33 PM.
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Old 18th December 2011, 08:26 PM   #3730
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I agree. That is more simple.
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