Keantoken's CFP cap multiplier

[tinitus]

Originally Posted by keantoken

This gives me an effective ground plane prototype.

now I could have used a ground plane
anyway
transistors are just random scrap, but shows to be convenient for moving around
resistors are very scratched from pulling in and out
but doesn't matter since I measure every time I move them
board could have been bigger though

[tinitus]

kean, you deserve a photo

power on/off works very smooth
no matter how crazy I use the switch, no noise

[keantoken]

Success!

Cheers.

[naf]

hi kean,
i've build a +rail of of your k-multiplier
using this part
q2 sa1873
q1 bc337
c1 1000uf/50v
d4/d1 1n4002
other same as schematic on your web

here my measuring
dc in 21.7v
dc out 20.14v
ac in 136mv
ac out 95mv
is this working good?

[naf]

ops... i mean sa1873 is sa1837

[keantoken]

95mV output AC is waaay too high. It should be in the 100uV range. If you short your meter leads what is the lowest AC it reads? Or did you use a scope?

What is the AC voltage across C1?

[naf]

hi kean thanks.
i don't have scope
my meter read 0.000v ac when i sort the probe

ac on c1 0.117v

[keantoken]

It sounds like something is shorting R2. Can you measure DC across R2?

How much total capacitance is at the output?

[naf]

dc across r2 = 4mv
not connected to any out yet.

[keantoken]

Load it with something for 30mA. A 560R 1W resistor would work. It may behave funny without any load.