There is options for that described in http://www.diyaudio.com/forums/power-supplies/192625-sslv1-1-builds-fairytales-103.html#post2945885
Hi guys, I have a Apogee Mini-dac, which uses a DC input in the range 9-14V. I built a ALW super reg and that powered it without problems. I have built a REFLEKTOR, set to 10V (which is confirmed with a multimeter) and that causes the DAC to display error lights. Any ideas? Is it cause current is set to low? If so, what is the easiest way to adjust this?
5 Vdc for Raspberry, squeezebox, etc... 1-2Aamp.
Thanx Stajo ! -Giving me a few hours of learning
Well i found the xls -calc, and tried to fill in my values.
I WILL (i think) use a 12vac tranny, 2sk170Gr (-which i have)
The PI uses 700mA for normal operation.
Can anyone have a look at the spreadsheet ?
I also stumbled upon a schematic in thread, where Salas have simulated a 5vdc out shunt (I have attached this in the .zip -file)
/Thanks - Jesper
Thanx Stajo ! -Giving me a few hours of learning
Well i found the xls -calc, and tried to fill in my values.
I WILL (i think) use a 12vac tranny, 2sk170Gr (-which i have)
The PI uses 700mA for normal operation.
Can anyone have a look at the spreadsheet ?
I also stumbled upon a schematic in thread, where Salas have simulated a 5vdc out shunt (I have attached this in the .zip -file)
/Thanks - Jesper
i get voltage sag trying to power this circuit with bib 1.1
peter's circuit's altered with 10 piggyback 1543s on each side, 20 total. the shunt reg is set at 6v. when i take the chips out the red leds come on and the v is healthy, when the chips go back in the red leds are off and the voltage sags to 2v.
weird thing is the reg works fine with 5piggyback chips, even 9 on one side, but 10, no go. i have multiple batches of 10 piggyback chips so i don't think that's the cause. r101 is 3.3ohm, but input diodes are unknown types that i salvaged and setup for half-wave rectification; which sound i always prefer.
maybe the diodes are the reason?
peter's circuit's altered with 10 piggyback 1543s on each side, 20 total. the shunt reg is set at 6v. when i take the chips out the red leds come on and the v is healthy, when the chips go back in the red leds are off and the voltage sags to 2v.
weird thing is the reg works fine with 5piggyback chips, even 9 on one side, but 10, no go. i have multiple batches of 10 piggyback chips so i don't think that's the cause. r101 is 3.3ohm, but input diodes are unknown types that i salvaged and setup for half-wave rectification; which sound i always prefer.
maybe the diodes are the reason?
How much current is the circuit drawing? What is the incremental draw going from, say 5 chips to 8 chips?
What you are describing is what happens when you try to draw more current than the regulator can supply. The red LED's go out and the regulator drops out of regulation. You need to look at the input AC voltage, how much current your transformer can supply, and how much current you are demanding from the reg. Assuming the transformer is OK you might need to lower R101 a little more.
What you are describing is what happens when you try to draw more current than the regulator can supply. The red LED's go out and the regulator drops out of regulation. You need to look at the input AC voltage, how much current your transformer can supply, and how much current you are demanding from the reg. Assuming the transformer is OK you might need to lower R101 a little more.
Get measurements. See about your actual CCS setting by Ohm's law (VR101/R101=CCSmA), see about your actual load consumption by interfacing a very small value resistor you got in your stash between the reg and the load. Solder it at the power receiving end of the load and use the same equation as for CCS. Measure the raw DC at input side across the big filter capacitor when the thing is fully loaded so to know if the trafo ducks. Maybe there is a short somewhere and over-current occurs. Or the many chips draw more than you may think. You would need at least 100mA more CCS ability than max load consumption to get it going decently.
BJT in this gives more output impedance but also more bandwidth VS MOSFET. A con and a pro. Depends on what your circuit likes more of the two traits. Better try between transistor and MOSFET than different from the recommended transistor type. Don't forget to use the right (different value) gate/base stopper resistor for either type of output as explained in the BOM.
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