Thor Supply CapMultiplier board in progress.
Some component values still not decided as well as the transistors in the capmultiplier but I have a few ideas.
The Cap Multiplier part of the supply circuit will be using a star ground to minimize hum.
Some component values still not decided as well as the transistors in the capmultiplier but I have a few ideas.
The Cap Multiplier part of the supply circuit will be using a star ground to minimize hum.
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I might be interested in a pair of Mk2 amps boards depending on final price.
Price would be $25 USD for a pair of MKII boards if I ever decide to get some boards made, not totally decided on that just yet.
You should just make a polygon and fill that whole area up.
Thats more like a spider than a star
Haha, yea, it looks like a spider.
However, I'm not sure a ground plane is a good idea for a cap multiplier.
What info I could find suggets a star ground layout for cap multipliers or atleast using something star-like.
But then again that was with nothing else than the cap multiplier connected after rectification, with LM317/LM337 as preregulation it might not be needed.
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Well, think I'm going with a ground plane.
Supply board should be done soon, just have to do a little more simulation and finding the correct transistors and resistor values.
Board should be ordered, mounted and tested some time in the beginning of april if all goes well.
Supply board should be done soon, just have to do a little more simulation and finding the correct transistors and resistor values.
Board should be ordered, mounted and tested some time in the beginning of april if all goes well.
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Here is a tip for Eagle...
Those heat sinks with pads have have pins in the schematic.
You can tie the heat sink pad to a net if you wish.
I know, but I like to keep heatsinks isolated from the circuit, including isolated from ground.
I know, but I like to keep heatsinks isolated from the circuit, including isolated from ground.
I have heard that this can sometimes lead to problems.
I have heard that this can sometimes lead to problems.
Out of interest, what problems might that be?
I've never seen it happen, but I've heard about it causing OscillatIon in power amp output stages
Interesting. That is something to think about then.
Did some re-thinking and subsequent re-designing of my supply.
Zener voltage reference with pass transistor follow by a cap multiplier using a 4A, 750 Hfe darlington transistor.
Ripple below 1 mV p-p in simulation at full load.
Starground with dual stars.
Zener voltage reference with pass transistor follow by a cap multiplier using a 4A, 750 Hfe darlington transistor.
Ripple below 1 mV p-p in simulation at full load.
Starground with dual stars.
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