Sine wave generator

[mister_e]

Is the frequency of 10MHZ may change or you want it fix?

1. Some Wein bridge Op-Amp circuit are possible.. at 10MHZ.. may work or not, never tried it before.
   
2. MAX038 will work... not cheap, do too much things
   
3. 10MHZ square wave TTL or CMOS based and integrated twice (or more) with low pass/bandpass/highpass filter using op-amp.
   
4. If your project will use a PIC.. why not choosing a 10MHZ Crystal and send the sgnal to a buffer... then send it to those low-pass filter?

[Mario]

Is the frequency of 10MHZ may change or you want it fix?

1. Some Wein bridge Op-Amp circuit are possible.. at 10MHZ.. may work or not, never tried it before.
   
2. MAX038 will work... not cheap, do too much things
   
3. 10MHZ square wave TTL or CMOS based and integrated twice (or more) with low pass/bandpass/highpass filter using op-amp.
   
4. If your project will use a PIC.. why not choosing a 10MHZ Crystal and send the sgnal to a buffer... then send it to those low-pass filter?

Actually why I 'm thinking in that way, because I'm restricted with 9 v battery so you can't use opamp and it's is not simple to design it using transistors (I'm not good in that).

As MR. Darrel Taylor said it's not possible with PIC , then help me with any circuits.

[Luciano]

Hi Mario,

Search DDS (Direct Digital Synthesis).
Search with Google: DDS 16f84

Examples with an AVR:
http://www.myplace.nu/avr/minidds/
http://www.geocities.com/leon_heller/minidds.html

Best regards,

Luciano

[Mario]

Hi Mario,

Search DDS (Direct Digital Synthesis).
Search with Google: DDS 16f84

Examples with an AVR:
http://www.myplace.nu/avr/minidds/
http://www.geocities.com/leon_heller/minidds.html

Best regards,

Luciano

thank you for ur co-operation but that will not work with me. My project should be portable (not connected PC).what I want exactly is simple (sinewave) oscillator circuit with a single supply (not more than 9v) at 10 MHz or more.

[Luciano]

Hi,

The two links I posted run with a 9V battery.
You don't need a PC. Add a keyboard and
an LCD if you need the ability to enter
a user selectable frequency.

Luciano

[mister_e]

why are you thinking that it will not work with OPAMP even @9V?

What else the project do? Do you need a variable frequency?

[Mario]

why are you thinking that it will not work with OPAMP even @9V?

What else the project do? Do you need a variable frequency?

..............

I know there are a single supply op-amp's but it might not give me acceptable sine wave ( amplitude )....and frequency...... if I can do it by op-amp just help me with good one I can use.

For me no need for variable frequency......... I wana connect it to power amplifier. I need my frequency to be stable that's why I need crystal.

I think it should be done in more simple way (n. of Chip used ,cost,....) than what they advice me to do..