Need info on diodes, 22pF and 100nF condensators

In the process of acquiring parts for:

http://usbirboy.sourceforge.net

and trying to determine what type of diode is needed and where to
locate/purchase.

I am a beginner at building these types of things. I am unsure if I
need a full-wave rectifier (4 diodes) or half-wave
(1 diode).

Wondering if this diode is usable:

1N4004 400V 1A General Purpose Silicon Diode

The defacto standard in rectifier diodes.
Forward Current: 1A
Surge Current: 30A
Forward Voltage: 1V
Package: DO-41
Reverse Voltage: 400V

http://store.fundamentallogic.com/ecom/index.php?main_page=product_info&products_id=37

Also trying to figure out if a condensator is the same thing as a
capacitor. (In need of two 22pF condensators and four 100nF
condensators, and it appears that the two terms are used
interchangeably.)

For example:

http://www.sunrom.com/index.php?main_page=product_info&products_id=492

Details
Multilayer metallised polyester film capacitors that are epoxy resin
sealed in a flame-retardant thermoplastic case.
These low-cost capacitors have a high CV to volume ratio and are
highly reliable and stable over a very wide temperature range (-5 C to
+100 C). The capacitors are non-inductive with a standard 5mm lead
spacing and are primarily intended for PCB mounting.

Suggestions?

Thanks....

 

[DJ Delorie]

ericakfreeman@gmail.com writes:

and trying to determine what type of diode is needed and where to
locate/purchase.

If you mean the one optionally connected to PTA0, it's an LED (light
emitting diode). Any red, orange, yellow, or green LED should work.

If you mean the one on the MAX232, yeah, any generic fast diode should
work. Me, I'd look for a "schottky" type diode - they're faster and
have a lower voltage drop. Either way, you're looking for something
in the "signal diode" category, not the "power diode" category. At
RS-232 speeds I don't think it really matters, though.

Some examples:
http://www.sunrom.com/index.php?main_page=product_info&products_id=324
http://www.sunrom.com/index.php?main_page=product_info&products_id=527

You don't say where you are, but in the USA any "parts" Radio Shack
should have those, else look at Digikey, Mouser, or Jameco.

Also trying to figure out if a condensator is the same thing as a
capacitor. (In need of two 22pF condensators and four 100nF
condensators, and it appears that the two terms are used
interchangeably.)

I've only heard the term "condensator" used rarely. Most folks call
them capacitors, or "caps".

http://www.sunrom.com/index.php?main_page=product_info&products_id=492

That's fine for the 100nf. For the USB board I'd use a 4.7uF near the
USB port and a 100nF near the chip's power pins. Make sure the
voltage rating is high enough - at least 10v for a 5v supply rail.

For the 22pF you might have to use a ceramic cap, but it's probably
not critical.
http://www.sunrom.com/index.php?main_page=product_info&products_id=168

 

[Dan Coby]

ericakfreeman@gmail.com wrote:

In the process of acquiring parts for:

http://usbirboy.sourceforge.net

and trying to determine what type of diode is needed and where to
locate/purchase.

I am a beginner at building these types of things. I am unsure if I
need a full-wave rectifier (4 diodes) or half-wave
(1 diode).

Wondering if this diode is usable:

1N4004 400V 1A General Purpose Silicon Diode

No. The diode in the schematic is an LED (light emitting diode). It
is optional and is used as a visible indicator. The 1N4004 is not a
light emitting diode so it will not do anything useful for you. You
can buy LEDs from any electronic supply place including Digikey,
Radio Shack, or whatever stores that you have in your area. For this
application, any small, cheap LED will do. For instance (using one
of the vendors that you referenced)
http://www.sunrom.com/index.php?main_page=product_info&cPath=56_40_60&products_id=250

Also trying to figure out if a condensator is the same thing as a
capacitor. (In need of two 22pF condensators and four 100nF
condensators, and it appears that the two terms are used
interchangeably.)

Yes, the terms are use interchangeably. 'Capacitor' is more common.
The term 'condensor' is pretty archaic. Its use seems to be more common
around people that do radio or TV work.

Why do you say that you need four 100nf capacitors when the schematic
only shows one?

I also note that the schematic shows 22pf caps, while the text with the
layout says 10 pf caps. Either value will probably work. For the few
pennies that they cost, I would buy both. Even better would be to check
the specification sheet for your crystal to see what is recommended.


Dan

 

[Nobody]

On Tue, 24 Mar 2009 12:13:44 -0700, ericakfreeman wrote:

In the process of acquiring parts for:

http://usbirboy.sourceforge.net

and trying to determine what type of diode is needed and where to
locate/purchase.

Looking at the schematic at:

http://usbirboy.sourceforge.net/board.html

it doesn't appear to need any kind of diode, other than an optional LED.

Ah; this is for the programmer:

http://usbirboy.sourceforge.net/prommer.html

It says "fast" diode, which usually means a Schottky type.

Also trying to figure out if a condensator is the same thing as a
capacitor.

"Condenser" is an archaic term for capacitor. "condensator" is a typo (one
of many on that site).

(In need of two 22pF condensators and four 100nF
condensators, and it appears that the two terms are used
interchangeably.)

Those are capacitors. The 22pF capacitors would normally be ceramic. The
100nF could be either ceramic or film; ceramic would be cheaper, but we're
talking about 5 cents versus 10 cents.

Note that 100nF is for the MAX232A. The datasheet says 1uF for the MAX232.