Post Created date
different voltage I/O
This information might also be of use. http://www.formfactors.org/devel...
Sunday, 23 August 2009 - 17:43
Mosfet Doubts
Absolutely, switching losses need to be considered. But the OP asked... Quote:Does this mean in can directly interface it with my AVR logic outputs. Or do i require a mosfet...
Saturday, 22 August 2009 - 00:17
What is Resolution and how to calculate it ?
So an old timer walks into a bar and asks "how many ticks for a cm?"
Friday, 21 August 2009 - 17:45
How to let a circuit shut itself down... SCRs?
Well, actually in the event of a reverse polarity the diode will "clamp" or "crowbar" the battery or power supply. A fuse or some other mechanism, might be included that would...
Friday, 21 August 2009 - 16:02
How to let a circuit shut itself down... SCRs?
Plons clearly has experience in design. His knowledge should be well considered. He included D2 in his circuit for a reason. One could remove D2 an feel good about saving 7...
Friday, 21 August 2009 - 15:22
Mosfet Doubts
Yep, you are correct Agwanll. A properly designed layout/heat sink is required. What is important here however, is that the FET I referenced is of a logic gate design, and in a...
Friday, 21 August 2009 - 15:04
How to let a circuit shut itself down... SCRs?
I agree with Brunomusw with regard to using a relay. The Elmcie power control section, indicated by FMaimon, is a low power, robust solution.
Thursday, 20 August 2009 - 23:03
How to let a circuit shut itself down... SCRs?
My bad, bloody-orc. No offense was intended. I guess I should have included "...as drawn..." somewhere in my post.
Thursday, 20 August 2009 - 22:21
Mosfet Doubts
I use the IRLR3303, source grounded (T0-252 surface mount) for switching 6 amperes @ 12 volts, with the gate directly connect to the an AVR output (pullups on). I use a 10K from...
Thursday, 20 August 2009 - 21:48
How to let a circuit shut itself down... SCRs?
One problem with Bloody-Orcs design is that with a 9 volt battery connected to the emitter, and an AVR output on the base, the transistor will always be ON. Further, the AVRs...
Thursday, 20 August 2009 - 21:34
How does this PCB layout look?
Well, examples have been known to have errors. If your feed supply is not well filtered, you will need more capacitance at the input of the regulator. Your call. I would fuse...
Wednesday, 19 August 2009 - 22:54
How does this PCB layout look?
On the schematic, you have C2 as a 330nF - probably meant 330 uF. Fusing the ground leg of the power supply is a odd. The 4 paralleled LEDs, will behave better if the each had a...
Wednesday, 19 August 2009 - 22:26

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