"Alexander" schreef in bericht
...

"John Fields" schreef in bericht
...
On Sun, 18 Sep 2005 23:22:03 +0200, "petrus bitbyter"
wrote:


Once you have a 555 clock running you can hook up an old CD4013B like
drawn
below. This type of components runs on power supplies from 3 to 20V. Of
course you have at least one problem left as these type of components can
sink only a few mA of current. So your LEDs will be pretty dim or you
have
to use high efficiency LEDs. The series resistors can also be much lower
then calculated as the outputs have an internal resistor inside. The best
thing you can do is using an extra IC, a CD4050B. This one contains six
buffers which are able to sink enough current to drive a LED.


Vcc 3-20V +-----+-----+-----+-----
| | | |
.-. .-. .-. .-.
| | | | | | | |
| | | | | | | |
'-' '-' '-' '-'
| | | |
| | | |
V V V V
- - - -
| | | |
| | | |
| +--------+ |
| | | |
| | +--------------+
.----. | | .---- | |
+-----|D0 Q|---+--|-----|D1 Q|---+ |
| | _| | | _| |
| +--| Q|o-----+ +--| Q|o-----+
| | '----' | '----' |
| | CD4013B(a) | CD4013B(b) |
Clock | | | |
----------+-----------------+ |
| |
+-----------------------------------+

---
Ah, yes... the quadrature encoder! Good one! It didn't even cross
my mind. I must be slipping...


--
John Fields
Professional Circuit Designer

And You call yourself a Professional Circuit Designer???
Ok, most of the time we have solutions that are not suitable for a
beginner (PIC 10F series?).

Alexander
A.C.E. (Applied Communications Engineer)


So why shouldn't he call himself a Professional Circuit Designer? He often
contributes circuits in the electronics newsgroups.

PIC10F2xx will be suitable for fixed frequency. I'd go for a 12F675 because
there's no need for extra components but one potentiometer for the variable
frequency that was asked for.

The point is however that the OP seems to have hardly any skills in
electronics so I doubt whether he can reed the schematics we provided.
That's not to blame the OP. After all this is a "basics" group so he put a
good question on the right place. But that's also why I try to keep it as
simple as possible and leave it to the OP to ask further if he needs to.

petrus bitbyter