Search found 326 matches

by Sambuchi
Sun Apr 12, 2009 1:37 pm
Forum: General Discussion
Topic: MOSFET Question
Replies: 12
Views: 1540

Re: MOSFET Question

Hello hmlittle welcome to the board. :D Let me hear back from you with any in-sight. thank I put a small page together with my findings. You can find it here. MOSFET LINK Bob is right and you need to be sure what need N or P channel... two different polarities. The above link has the following PNP M...
by Sambuchi
Thu Apr 09, 2009 7:37 pm
Forum: General Discussion
Topic: MOSFET Question
Replies: 12
Views: 1540

Re: MOSFET Question

:D :D :D OK I see what I was missing. In the Spice Model there is a variable called Vto. I believe that deals w/ the threshold voltage. As I pick certain FETs with lower Vto's they don't work. I now feel comfortable buying some FETs now! Also, last time I looked SwitcherCAD had a pretty limited set ...
by Sambuchi
Thu Apr 09, 2009 12:32 pm
Forum: General Discussion
Topic: MOSFET Question
Replies: 12
Views: 1540

MOSFET Question

Ok... I've been playing with some hardware the past few months and I'm shocked at how much I forgot just by doing firmware over the years. I need to run a 3.3V logic line to a P-Channel MOSFET. Its running to the gate and I have 5V at the Source. I will be drawing .08mA when active... I'm not switch...
by Sambuchi
Fri Apr 03, 2009 3:48 am
Forum: General Discussion
Topic: "Counters" day coming soon...
Replies: 10
Views: 1528

Re: "Counters" day coming soon...

Incredible Mr Al!

I will be on a week long cruise celebrating my birthday on July 7th that week

If I have any brain cells left to remember 456789 I will be sure to cheers everyone!

-Tony :lol:
by Sambuchi
Sat Feb 28, 2009 6:13 am
Forum: General Discussion
Topic: quick logic level question
Replies: 7
Views: 1272

quick logic level question

I have 0 to 5 volt digital signal.

If I wanted to convert it to 0 to 3.3 volt...

Could I drop a diode in line to regulate it to 3.3?

The baud rate is 19200.

_____________

Tony
by Sambuchi
Tue Jan 13, 2009 4:10 am
Forum: General Discussion
Topic: PC-based Logic Analyzers
Replies: 5
Views: 1002

PC-based Logic Analyzers

I'm in the market for a PC-based Logic Analyzer. I am googling right now and getting lots of hits. The interesting thing for me is that I dont need anything very fast. I would say in the rates of 9600. I am using the tool for its sampling capabilities. So it needs to store at least 8 bytes of data f...
by Sambuchi
Mon Jan 05, 2009 5:50 pm
Forum: Computer Programming
Topic: Panasonic 3.5" Floppy Failures
Replies: 5
Views: 1194

They have been known to take off a head now and then.

Be careful!
by Sambuchi
Mon Jan 05, 2009 4:27 am
Forum: General Discussion
Topic: RS232
Replies: 12
Views: 1821

Do you need full compliance?l Sure! I would like this box to work on any computer. Voltage levels- The RS-232 standard defines the voltage levels that correspond to logical one and logical zero levels. Valid signals are plus or minus 3 to 15 volts. The range near zero volts is not a valid RS-232 le...
by Sambuchi
Fri Jan 02, 2009 10:16 am
Forum: General Discussion
Topic: RS232
Replies: 12
Views: 1821

This looks interesting... http://picprojects.org.uk/projects/simpleSIO/ssio.htm But it gets the negative supply for the RS232 transmit data [from the micro] from the serial RS232 receive data line[from the PC]. I am guessing for this to work the PC needs to transmit while it receives for this to work?
by Sambuchi
Fri Jan 02, 2009 9:20 am
Forum: General Discussion
Topic: RS232
Replies: 12
Views: 1821

9600. nothing fast. This can be adjustable.
by Sambuchi
Fri Jan 02, 2009 9:07 am
Forum: General Discussion
Topic: RS232
Replies: 12
Views: 1821

Hello Al,

Looking at -5v to +5v input to a 0v to 3.3v output and back.
by Sambuchi
Fri Jan 02, 2009 5:49 am
Forum: General Discussion
Topic: RS232
Replies: 12
Views: 1821

Hmmm... I'm reading about a Schmidt trigger IC.

This sounds interesting and could do it for me.
by Sambuchi
Fri Jan 02, 2009 4:54 am
Forum: General Discussion
Topic: RS232
Replies: 12
Views: 1821

RS232

This might be a silly question... but does Maxim or any other IC company make a RS232 solution that can receive 5V logic and output 3.3V logic? I see Maxium has a wide variety of IC's that can run on 5V to 3.3V source, but how about the logic? I would like to make a box that would interface to a com...
by Sambuchi
Sun Dec 14, 2008 8:00 am
Forum: General Discussion
Topic: 1.5V to 5V
Replies: 23
Views: 4354

Hello everyone. The circuit mentioned in this thread really sparked my interest. So much that I am running simulations with two tools and spent most of yesterday playing with different components in the circuit. I understand this topic was discussed in a previous thread but maybe someone here could ...
by Sambuchi
Thu Dec 11, 2008 11:54 am
Forum: General Discussion
Topic: 1.5V to 5V
Replies: 23
Views: 4354

oops sorry peter... I was just catching up the entire thread and forgot who did the simulation. When I make it in PSpice Transient simulation with the same parts... "VSRC source with a TRAN=1.5 then setting up the print step and final time" Your second simulation you have VLoad at 2.8V my simulation...