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how to find diameter and length of yarn
As I recall from what little playing I've done with yarn, it's composed of many individual fibres more or less loosely twisted together. If start with a loose length of yarn, the...
Thursday, 6 September 2012 - 20:37
XMega128A4U DAC won't output 0 volts
I don't think the output of even an R-2R network can go all the way to zero volts. With all the inputs to the network at a logic low, the output of the network would be just a...
Thursday, 6 September 2012 - 14:25
Converting 5V to audio (+1v / -1V)
A quick and dirty way would be a resistor voltage divider to reduce the 0-5v down to 0-2v, then a series capacitor to remove the DC offset and leave you with -1v to +1v. A more...
Wednesday, 5 September 2012 - 14:12
7 SEGMENT
ereihani, since the voltage across two LEDs in parallel is the same as the voltage drop across one LED, the voltage drop across the resistor does not change as you add extra LEDs...
Wednesday, 5 September 2012 - 14:01
7 SEGMENT
An LED is simply a diode, and like all diodes, it doesn't follow Ohm's law. The current in the resistor is (VCC-VLED)/R VLED is the voltage drop across the LED, and it more or...
Tuesday, 4 September 2012 - 19:12
7 SEGMENT
It's not recommended. The resistor limits the current, but if there's only one resistor, that current is shared between all the segments that are on at any given time. This means...
Tuesday, 4 September 2012 - 18:53
Step down transformer for DC power supply
I figured out why that first link didn't work. There's an extra ) on the end of the URL. Looking on the transformer, it can be connected in several ways depending on what you need...
Thursday, 30 August 2012 - 00:53
Step down transformer for DC power supply
The link you gave seems to go to a dead page, so I can't look at the transformer specs. As for the capacitor value, you might want to look at this page... http://www.changpuak.ch/...
Wednesday, 29 August 2012 - 20:25
Square Wave Phase shift
Subieghost, any oscillator circuit designed to work with TTL logic will work with this circuit. I suspect that one of the square wave oscillators you already have will work, as...
Thursday, 23 August 2012 - 20:09
Square Wave Phase shift
Here's a schematic of a circuit I did for something else that should do what you want. You need to supply +5V power, and a square wave clock. The two outputs are 1/4 of the clock...
Thursday, 23 August 2012 - 17:49
Arduino, I2C, pca9600 and mcp9808, please help.
There's a good chance that your data signals are coupling to the sensor power supply via the capacitance between the wires in the twisted pairs. I'd suggest trying a low dropout...
Monday, 13 August 2012 - 18:17
Question on Driving 5V Relays with N-Chan MOSFET
R4 is indeed a current limiting resistor. The gate of the MOSFET has a lot of capacitance. Charging that capacitance draws a brief spike of current from the output pin on the...
Monday, 6 August 2012 - 01:54

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