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Help with oscillator chip

P

Patrick Leonard

Jan 1, 1970
0
I have one of those can-type crystal oscillator chips (2 Mhz) that uses only
2 leads. Could someone tell me how to wire this thing up? Do I simply
apply a voltage across it, and that will result in its oscillating? What
voltage do I use?
 
R

Robert Monsen

Jan 1, 1970
0
Patrick Leonard said:
I have one of those can-type crystal oscillator chips (2 Mhz) that uses only
2 leads. Could someone tell me how to wire this thing up? Do I simply
apply a voltage across it, and that will result in its oscillating? What
voltage do I use?

There are lots of ways. Don't just apply voltage across it, that won't do
anything.

You need an active device like a transistor or inverter IC.

Try searching the web for 'crystal oscillator schematic'.

Regards
Bob Monsen
 
B

bubaloo

Jan 1, 1970
0
You likely have a crystal, which is only one of the component of a typical
crystal oscillator. It acts sort of like a very high "Q" LC combination.
There are many different circuit configurations that can be employed (and
not all will necessarily work so well for your particular device). Do a
Google search on, say, "crystal oscillator configurations" to get some
ideas. Here is one link that might be useful http://www.z80.info/uexosc.htm
..
 
J

Jan-Erik Söderholm

Jan 1, 1970
0
Patrick said:
I have one of those can-type crystal oscillator chips (2 Mhz) that uses only
2 leads. Could someone tell me how to wire this thing up?

To what ?
What will you use it for ?

Jan-Erik.
 
P

Patrick Leonard

Jan 1, 1970
0
Nothing, really. I just want to look at its output on an oscope.
 
J

Jan-Erik Söderholm

Jan 1, 1970
0
Well, you can't. What you have is most probaby a "crystal".
It doesn't have any "output", and it can't do anything without
an oscilator.

Now, with just two pins, and after connecting power and ground,
where did you thought the "signal" would exit anyway ?

Jan-Erik.
 
P

Patrick Leonard

Jan 1, 1970
0
Well, you can't. What you have is most probaby a "crystal".
It doesn't have any "output", and it can't do anything without
an oscilator.

Now, with just two pins, and after connecting power and ground,
where did you thought the "signal" would exit anyway ?

.....hence my original post :)
 
S

Soeren

Jan 1, 1970
0
Hi Jan-Erik,

Now, with just two pins, and after connecting power and ground,
where did you thought the "signal" would exit anyway ?

Not that it's done (AFAIK), but it could be - if current driven :)

Something like this:

O V+
|
[Resistor]
|
+---O Output
|
[Oscillator]
|
/
 
R

Robert Monsen

Jan 1, 1970
0
Patrick Leonard said:
I have one of those can-type crystal oscillator chips (2 Mhz) that uses only
2 leads. Could someone tell me how to wire this thing up? Do I simply
apply a voltage across it, and that will result in its oscillating? What
voltage do I use?

Any moderately fast inverter will work. In particular, 74HCT04 or the 4049
will both work.

R1 220k
___
+--|___|--+
| |
| |
| |\ |
+---| >O--+
| |/ |
| .-.
| | |
| | | R2 220
| _ '-'
| | | |
+--|| ||--+
| |_| |
--- ---
--- ---
| | C1 = C2 = 22pF
+---------+
|
===
GND
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