Raspberry Pi Forums

Astro02

anyone can tell me the difference of 74HC4050N from nxp and CD74HC4050E from TI
the first cost 0.85 € and the second 0.35 €

Astro02

the 74HC541 or 74hc4050 works?
(i hate smd component are too small

)
what is the difference of a hex level shifter and a level shifter?
what is the tree-state output?

Astro02

I use these >>> http://www.ebay.co.uk/itm/4-channel-Bi-Directional-Logic-Level-Shifter-Converter-3-3V-5V-For-Arduino-/321763314096?hash=item4aea9689b0:g:nm0AAOSw~OdVYXxJ They are bi-directional and can also converter 2.8V and 1.8V devices. In your case just connect Vhigh to the RPi 3.3v and Vlow to...

Astro02

i'll try when arrive my raspberry,
the trasfer rate of voltage divider is comparable to a level shifter(5-20Mbps)?
if i use a zener diode the R1 is the same of voltage divider

Astro02

thanks, but i don't want make a disaster, i need to connect the raspberry with open ocd,to a old phone to load a bootloader into it, it has a msm7227 cpu whit a arm1136 core that can accept max2.6V
i also need to convert 2.6 to 3.3 for tdo(return data)

Astro02

i found 74HC4050N can be used for this ?

Astro02

wikipedia mean:For direct current and relatively low frequencies, a voltage divider may be sufficiently accurate if made only of resistors;

in my applicatiom will be a cpu, a rapberry pi and the the frequency of jtag is 5mhz

Astro02

can CD40109B or CD4504B or SN74LVC245ADWR or 74hc244 do this work?

Astro02

exists a breadboard equivalent of bss138(i hate smd component are difficult to solder)
Edit:
Anyone know if
I also need to level translate the jtag nRST and tRST?
Edit2: the sot-23 package can be soldered with normal iron solder

Astro02

i live in italy and i wan't pay up to 20€ for a 2€ chip
i have already foud this https://www.sparkfun.com/products/11771
thanks anyway

Astro02

I have googled a lot, i thinked that you know some chip, thank anyway

Astro02

thanks can you tell me a circuit or a breadboard integrated circuits to do this work(i know that txb010x or tbs010x but i don't know how solder a tssop package)

Astro02

I need a level shifter to Translate 3.3v(Rpi gpio) to 2.6v (i need to use openocd, for some jtag test ) can i use this circuit appling 3.3 to hight side and 2.6 to low side (TMS,CLK,TDI) and can be used to translate 2.6v to 3.3v with the same connection(TDO) http://3.bp.blogspot.com/-T25-pCPZz2I/Uj6...

Astro02

you can run wine on arm board using qemu(free) or exagear desktop (paid)
http://wiki.winehq.org/ARM
section windows/x86 app

Astro02

ok; there is a breadboard version of picnc v2 for polulu?
if i want make a pbc i need smd resistor?
can anyome make a list of all pieces for picnc polulu, please?
edit:can i use the unl2003 to convert a five wire stepper to a 4 wire stepper

Astro02

how i have to connect the 4 wire of unl2003 driver?
i have to control this
http://www.hobbyking.com/hobbyking/stor ... rd_5V.html
Edit:a 74HCT367N can be used over 74HCT367

Astro02

thanks,if I build the lpt board can I use the LD293 or the unl2003,the can work with lpt port?

Astro02

on the wiki i don't view any schematic for home building

Astro02

can post the schematic for picnc and for the programmer?
can i use a simple unl2003 or ld293 for stepper controller?
i want do a very basic machine

Astro02

can i make a homemade picnc v2?

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