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In this circuit:
http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
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In this circuit:http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
---On Nov 14, 10:24 am, mrdarr...@gmail.com wrote:
In this circuit:http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
Never mind... I think it has something to do with the input
impedance...
---On Fri, 14 Nov 2008 10:32:50 -0800 (PST), mrdarrett@gmail.com wrote:
On Nov 14, 10:24 am, mrdarr...@gmail.com wrote:
In this circuit:http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
Never mind... I think it has something to do with the input
impedance...
---
Only incidentally.
Think about it like this:
At the top of the pot the input signal will be at its maximum amplitude
since that's connected to the output of the signal source, and at the
bottom of the pot it'll be at 0 volts, since that's ground. Anywhere in
between it'll be somewhere between max and 0.
What you have with a potentiometer is what looks like two resistors in
series with the slider at their junction, like this:
VIN>---+
|
[R1]
|
+------->VOUT
|
[R2]
|
GND>---+------->GND
Since it's a 10k pot, let's assume the slider is located half-way
between the two ends, like this:
EIN>---+
|
[5k]
|
+------->VOUT
|
[5k]
|
GND>---+------->GND
Then, if we relabel the circuit for convenience:
E1
|
[R1]
|
+---E2
|
[R2]
|
GND
we can say:
E1 * R2 1V * 5kR
E2 = --------- = ---------- = 0.5V
E1 + R2 1V + 5kR
A volume control is a variable voltage divider. If the bottom end ofIn this circuit:
http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
On Fri, 14 Nov 2008 10:24:19 -0800 (PST), mrdarr...@gmail.com wrote:
In this circuit:
http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
A volume control is a variable voltage divider.
If the bottom end of
RV1 was not grounded, RV1 would just be a variable series resistor,
and would have very little effect on the volume.
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info:http://vancouver-webpages.com/peter
Vancouver Power Squadron:http://vancouver.powersquadron.ca
yeah, like everybody says, and you're on the right track with yourIn this circuit:http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
One quick question regarding the labeling conventions of the resistors inIn this circuit:
http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
Exactly right. one reason for this is it makes printed schematicsmrdarrett@gmail.com> wrote in message
news:a4c97e0b-4b14-41dc-b5f2-169fb85d0d7d@s9g2000prg.googlegroups.com...
In this circuit:
http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
One quick question regarding the labeling conventions of the resistors in
the schematic. Why are some labled this way: 1K5 or 2K7
Is that 1.5K , 2.7K ohms? Makes sense, I just haven't seen that before.
On 2008-11-15, sbrehler <sbrehler@mndspring.com> wrote:
mrdarrett@gmail.com> wrote in message
news:a4c97e0b-4b14-41dc-b5f2-169fb85d0d7d@s9g2000prg.googlegroups.com...
In this circuit:
http://kitsrus.com/projects/k48.pdf
Why is the other end of RV1 grounded?
Thanks,
Michael
One quick question regarding the labeling conventions of the resistors in
the schematic. Why are some labled this way: 1K5 or 2K7
Is that 1.5K , 2.7K ohms? Makes sense, I just haven't seen that before.
Exactly right. one reason for this is it makes printed schematics
easier to read.
Look at C5 if I scale the schematic to "125%" the '.'
almost disappears, by using a letter instead of a '.' the values are
more easily read, (they could have labeled C5 100nF, I don't know why
they didn't)
they should have used vector graphics instead of pixels for
the schematic then it would scale better - but that's a different
matter
also the font they chose has the '.' skewed to the left which is
unfortunate.
bye.