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Is this real?
If the housing contains a magnet, moving a metal rim near it will generate eddy currents, but it will generate those currents in the metal of the rim, not in the magnet. Unless...
Thursday, 22 March 2012 - 17:57
Creating a 8x8 LED matrix with 2 shift registers?
Looking at the HC595 data sheet, you could use one to drive either the rows or the collumns directly, but not both, so you will need at least one driver. If you drive the LEDs by...
Thursday, 22 March 2012 - 13:38
Creating a 8x8 LED matrix with 2 shift registers?
The TPIC6B595 would only be useful if you needed to reduce the size of the board, other than that, it is more expensive than separate chips. I don't know of any other source...
Tuesday, 20 March 2012 - 20:50
Creating a 8x8 LED matrix with 2 shift registers?
Use a pair of cascaded shift registers to drive everything off one set of pins. Shift out the column data, then the row data, and finally send the latch pulse. Total, three pins...
Monday, 19 March 2012 - 14:23
Step motor datasheet
It looks like what you might have is a five phase stepper motor with the windings arranged in a pentagon. A little bit of playing with the math shows that any two adjacent...
Friday, 16 March 2012 - 01:29
Triac not activating contactor
I found the specs for the coil here: http://www.ab.com/en/epub/catalogs/12768/229240/229248/1313100/tab5.html The nominal inrush is given as 132VA for a 60Hz supply. at 24V, that...
Tuesday, 17 January 2012 - 14:40
Is this circuit safe and can work normal
That circuit has a couple of major problems with it. First, there's no overcurrent protection. A failed diode in the bridge rectifier will result in a short across the 230VAC...
Thursday, 29 December 2011 - 16:08
Quad Data Selector
You might want to look at using separate ICs for each multiplexer. sn74lvc2g157 from TI looks like it'll meet your needs, although you'll need to use four of them. They are...
Friday, 16 December 2011 - 19:12
Need help in circuit diagram of comparator of line follower
What most people refer to as 'ground' is actually the circuit common reference. By definition, that point is at zero volts. Unless you are using some sort of isolation circuit...
Wednesday, 30 November 2011 - 01:08
Level shifter circuit + diode clamps ?
Back up in the sticky topics is an item on level shifting in the tips and tricks thread. Buried in there is a link to an article on a mosfet level shifter for i2c systems. A...
Wednesday, 23 November 2011 - 00:01
Current Sense
you might want to look at the ACS712 current senseors. they have the advantage that the input is isolated from the output, so you can put them anywhere in the circuit. http://www....
Monday, 14 November 2011 - 19:23
Need a way to measure resistance. possibly op-amps?
Rather than using a resistor in a voltage divider circuit, you could use something like an LM317 voltage regulator to generate a constant current through the sensor. The voltage...
Saturday, 6 August 2011 - 19:59

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