car Heater fan controller in NUTS & VOLTS Magazine December 2005

[dorfX]

i found car Heater fan controller circuit in NUTS & VOLTS Magazine
December 2005.page 13.
But problem is that i do not know whatkind capacitors are.
47µf is electrolyt capasitor that i know. i can only guessing
that rest of them are "caramic" and "film capasitor", what is what,
that is mystery.
capasitors are: 0.33 / .01 / .0027.
i hope that here is NUTS & VOLTS Magazine readers who can help.

where i can find alternative fan controller intsructions, if capasitors
type stay unknown.?

 

[Rheilly Phoull]

i found car Heater fan controller circuit in NUTS & VOLTS Magazine
December 2005.page 13.
But problem is that i do not know whatkind capacitors are.
47µf is electrolyt capasitor that i know. i can only guessing
that rest of them are "caramic" and "film capasitor", what is what,
that is mystery.
capasitors are: 0.33 / .01 / .0027.
i hope that here is NUTS & VOLTS Magazine readers who can help.

where i can find alternative fan controller intsructions, if capasitors
type stay unknown.?

Just use greencaps?

 

[Pooh Bear]

i found car Heater fan controller circuit in NUTS & VOLTS Magazine
December 2005.page 13.
But problem is that i do not know whatkind capacitors are.
47µf is electrolyt capasitor that i know. i can only guessing
that rest of them are "caramic" and "film capasitor", what is what,
that is mystery.

What's the mystery about that ?

Those are types of capacitor.

capasitors are: 0.33 / .01 / .0027.

They'll be values in uF .

i hope that here is NUTS & VOLTS Magazine readers who can help.

where i can find alternative fan controller intsructions, if capasitors
type stay unknown.?

Apparently they aren't unknown at all. You're simply inexperienced in these
matters.

Graham

 

[Si Ballenger]

What's the mystery about that ?

Those are types of capacitor.


They'll be values in uF .


Apparently they aren't unknown at all. You're simply inexperienced in these
matters.

Graham

Your assumption that all the caps are uf may or may not be
correct. I've seen euro types using nf values for caps and the
47uf could be to identify that cap as not being assumed nf
values.

 

[Rich Grise]

i found car Heater fan controller circuit in NUTS & VOLTS Magazine
December 2005.page 13.
But problem is that i do not know whatkind capacitors are. 47µf is
electrolyt capasitor that i know. i can only guessing that rest of them
are "caramic" and "film capasitor", what is what, that is mystery.
capasitors are: 0.33 / .01 / .0027. i hope that here is NUTS &
VOLTS Magazine readers who can help.

where i can find alternative fan controller intsructions, if capasitors
type stay unknown.?

The .33 is probably plastic film - you can get ceramics this big, but
they're kind of expensive. The .01 and .0027 are ceramics, probably -
..0027 sounds kind of specific - it could be mica. Is the article on-
line anywhere?

Since they're for use in a car, I'd recommend getting capacitors that are
rated for at least 100V working voltage, and be sure to use some kind of
"load dump" protection, like maybe a hash choke and a TransZorb.

Good Luck!
Rich

 

[Joseph2k]

i found car Heater fan controller circuit in NUTS & VOLTS Magazine
December 2005.page 13.
But problem is that i do not know whatkind capacitors are.
47µf is electrolyt capasitor that i know. i can only guessing
that rest of them are "caramic" and "film capasitor", what is what,
that is mystery.
capasitors are: 0.33 / .01 / .0027.
i hope that here is NUTS & VOLTS Magazine readers who can help.

where i can find alternative fan controller intsructions, if capasitors
type stay unknown.?

Kindly direct your inquiry to sci.electronics.basics

 

[Si Ballenger]

Kindly direct your inquiry to sci.electronics.basics

Posting non answers looks kind of stupid. If you don't have
answer, maybe sci.electronics.basics is for you too.

 

[David Harmon]

On 5 Feb 2006 00:57:57 -0800 in sci.electronics.design, "dorfX"

i found car Heater fan controller circuit in NUTS & VOLTS Magazine
December 2005.page 13.
But problem is that i do not know whatkind capacitors are.
47µf is electrolyt capasitor that i know. i can only guessing
that rest of them are "caramic" and "film capasitor",

For those who do not have it, the schematic can be viewed at
http://tinypic.com/view/?pic=nbaw0o

My chief complaint is that the input and output of the 7805
regulator seem to be reversed, which wouldn't be good.

The smaller capacitors can all be ceramic or whatever you have in
your junk box from that old TV you took apart. None of the values
are very critical.

 

[David Harmon]

On Mon, 06 Feb 2006 04:07:27 GMT in sci.electronics.design, David

My chief complaint is that the input and output of the 7805
regulator seem to be reversed, which wouldn't be good.

Additional complaints include:
78L05 is inadequate to withstand automotive load dump voltages.
No freewheel/antikickback diode provided for the motor.

I concur with Rich that the capacitor on the "12V" side should have
at least a 100V rating. Basically, this is a crappy design.

 

[Pooh Bear]

On 5 Feb 2006 00:57:57 -0800 in sci.electronics.design, "dorfX"


For those who do not have it, the schematic can be viewed at
http://tinypic.com/view/?pic=nbaw0o

My chief complaint is that the input and output of the 7805
regulator seem to be reversed, which wouldn't be good.

Sloppy draughting !

The smaller capacitors can all be ceramic or whatever you have in
your junk box from that old TV you took apart. None of the values
are very critical.

The 0.0027 might prove tricky to get ( not a popular value ) in which
case substitute 0.0022 uF ( 2.2 nF ).

Graham

 

[dorfX]

thank for you all.
Seems that car Heater fan controller
needs few improvings.
- diodes in fan motors both wires.
-"78L05 is inadequate"--> TransZorb to 12v input.
- 0.0027µf -->2700 pf Ceramic capacitor ?

that`s it.

 

[dorfX]

Thanks for you all

..Seems that car Heater fan controller
needs few improvings.
- diodes in fan motors both wires.
-"78L05 is inadequate"--> TransZorb to 12v input.

0.0027µf is same than 2700 pf Ceramic capacitor ?

 

[Michael A. Terrell]

0.0027µf is same than 2700 pf Ceramic capacitor ?

Yes

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Rich Grise]

Thanks for you all

.Seems that car Heater fan controller needs few improvings.
- diodes in fan motors both wires.
-"78L05 is inadequate"--> TransZorb to 12v input.

0.0027µf is same than 2700 pf Ceramic capacitor ?

Yes, one picofarad is 0.000001 microfarad. (and .001 nanofarad,
but anybody can look that up.)

I still haven't seen the circuit, but from the discussion so far on
the thread, it sounds non-critical, so I'd say, if you can get one,
it'll be fine.

There's also plastic and mica, but it depends on the application
as to whether you'd need something like that. (precision, accuracy,
tempco, that sort of thing.)

Good Luck!
Rich

 

[John B]

On 5 Feb 2006 00:57:57 -0800 in sci.electronics.design, "dorfX"


For those who do not have it, the schematic can be viewed at
http://tinypic.com/view/?pic=nbaw0o

My chief complaint is that the input and output of the 7805
regulator seem to be reversed, which wouldn't be good.

Why is the 78L05 there at all. The 555 can easily take the 12V supply and is probably more robust
than the 78L05.