New lower price for Axon II ($78) and Axon Mote ($58).
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EDIT:Does any one know of a good (free)3D CAD?
What is the bridge rectifier for
Besides I have only 1 diode but I have plenty of rectifiers, and I get extra marks for "exotic" components
If there is a possibility of connecting power in reverse polarity then the bridge rectifier is not a bad idea. The Microchip PICDEM-2 board uses a bridge rectifier on the power input. This allows a wall wart PS with either + on the tip or the ring of the coax plug to be used.In my designs for commercial products (research lab instruments) we try to design so that a user does damage the equipment if connect wrong. We always protect the power input from reverse polarity with either a series diode, if the circuit can accept the voltage drop, or a fuze and shunt diode. We consider this cheap protection.
Rectifier = two diodes in circuit, which means a 1.2 volt volage drop! Lots of wasted power there.
...Only in a University do you get credit for a wasteful expenditure. In industry you would lose your job at worst, or be told to quit wasting money at best.
Rectifier = two diodes in circuit, which means a 1.2 volt volage drop! Lots of wasted power there.A rectifier has four diodes in a circuit.
If sparkfun comes out with 6 v button cells @ 400mAh I'll use a rectifier...
Hi,Quote from: voyager2 on June 23, 2010, 07:41:14 AMIf sparkfun comes out with 6 v button cells @ 400mAh I'll use a rectifier...Two lithium cells stacked should do.
...Apart from that, if you want efficiency, either use a MOSFET or better yet, a fuse and a diode to do the protection without any loss.After all, you have to be seriously dumb to swap polarity when you install it...