Sine wave generator

[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..

[mister_e]

How about my favourite LT1722?

Maybe i'll try to figure out something. So if i correctly undrstand, the only thing you need is a simple 10MHZ SineWave generator... nothing else, no PIC, no LCD nothing else?

[Mario]

How about my favourite LT1722?

Maybe i'll try to figure out something. So if i correctly undrstand, the only thing you need is a simple 10MHZ SineWave generator... nothing else, no PIC, no LCD nothing else?

That's what I'm trying to tell.

I will try with LT1722 thanxx

[mister_e]

Something that spring to mind using a PIC.

Use a 12F629 or else with an external Crystal. Fed the CLKOUT signal to those OpAmp Filter.

The PIC will manage the Power-on/Off AND monitor the battery voltage. Could be interesting now... well just an idea.

One other using a 12F683.
This one Will produce a PWM signal on GP2 to generate a negative voltage for the OpAmp and do the same things as the previous suggestion.

Unfortunately those baby 10F can't run with an external OSC... that would be perfect here...