2MHz oscilator circuit

[A2K]

Hi all.....

Has anyone got a design for a Oscilator circuit that generates a 2MHz square wave that they would not mind sharing.

Thanks a mil!!!!!!....

Cheers,

AK

 

[Wrighty]

Yes you can use a astable multivibrator, such as a 555 timer configured to create Square waves. Square waves are rich in harmonics so you can easilly get your 2MHz frequency that you want.

 

[nos_slived]

I'd suggest just buying one from digikey(or the closest store to you). Here's one that I made. Make sure that you use a good relay.

Parts:
IC1=4011 Quad-Nand Gate
R1=??? Probably 470K
R2=10K
C1=0.01uF
Q1=PNP3906
Diode at relay=4001-4007

 

[panic mode]

you can use ready oscillators ( see old pc cards and mobo).
if the frequency is not correct, you can use divider (i have bunch of 4MHz
oscillators). i don't know what is relay supposed to do in previous post.
relays have mechanical parts and they will hardly go faster than some 10-20Hz. even if it could run on 2000000Hz, i would suggest not to wire transistor as emiter follower and please add some resistor in the base circuit...

 

[bonxer]

Here's a tutorial on using a 555 timer to generate a pulse with an approximate frequency. **broken link removed**
And yeah, what's up with the diagram above with a relay :?:

 

[nos_slived]

you can use ready oscillators ( see old pc cards and mobo).

Thats what I said in my first sentence...

i don't know what is relay supposed to do in previous post.
relays have mechanical parts and they will hardly go faster than some 10-20Hz. even if it could run on 2000000Hz

Relay is if you are using a voltage that the can't 4011 can't handle. If you get a really good relay, it can go that fast, but then price goes up. Thats why I said buy an oscillator.

 

[audioguru]

Hey Nos,
The frequency of your oscillator is only about 3KHz. The request was for a 2MHz oscillator, 666 times higher. With a 12V supply, a 27pF cap and about 3.3K for both resistors, I made a 1.6MHz oscillator like yours.

What relay can toggle that fast and if it could, what would it do?