Anotehr Basic Q. re: a circuit

On Aug 6, 4:08 am, John Fields <jfie...@austininstruments.com> wrote:

On Wed, 6 Aug 2008 11:57:42 +1000, "Phil Allison"



philalli...@tpg.com.au> wrote:

mrdarr...@gmail.com
"Phil Allison"
"Kris Krieger"

http://www.instructables.com/id/S8Q5N9QFHTAIQK7/

** Completely absurd schem, has a motor being driven by the discharge
transistor of a 555 ?

" Madulation " = ROTFL !!

God there is some dire shit published on the internet.

.... Phil

From Pin 7, too, not Pin 3. Weird. Must be a tiny motor.

If taking output from Pin 3, max = what, 0.200 A?

What is the max current output from Pin 7?

** About 7mA according to the 555 spec sheet.

---
Not true.

Depending on how much drop you can tolerate in the 555's output it can
source or sink up to 200 mA.

http://www.nxp.com/acrobat_download/datasheets/NE_SA_SE555_C_2.pdf

JF

Yes, 200mA from Pin 3. The OP's circuit has the motor connected
between Vcc and Pin 7, however - not between Pin 3 and ground (or
between Pin 3 and Vcc.)
http://www.instructables.com/id/SALN0P4FHTAIQKM/

Very strange.

Michael

 

[Charlie Siegrist]

On Wed, 06 Aug 2008 18:01:00 -0500, Kris Krieger wrote:

If Phil chooses to believe I'm an idiot...

Phil chooses to believe everyone is an idiot. It's his nature.