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Old 9th June 2012, 10:58 AM   #11
Frex is offline Frex  France
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Join Date: Nov 2009
Hi,

Probably the easiest way to do sine wave between 0-10MHz (and more) is to use a DDS
synthesizer IC. If you have some knowledge in micro-controller programming, you can do all by yourself. Otherwise, you can buy one already build from many different source.
You can look this one, it seem interesting for your needs(but limited to 5MHz).
Also this one, up to 20MHz.
Regards.

Frex

Last edited by Frex; 9th June 2012 at 11:04 AM.
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Old 9th June 2012, 11:10 AM   #12
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Location: UK
Quote:
Originally Posted by Osvaldo de Banfield View Post
Katie: I triyed this way, but didn“t give good results.
Any RC oscillator depends on the matching of the R's and C's mine was perfectly OK.
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Old 9th June 2012, 11:23 AM   #13
PChi is offline PChi  United Kingdom
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Location: Staines, UK
Thanks to everyone for their inputs. I am considering the various options.

Unfortunately the MAX038 is obsolete so I am not keen to use it.

In the UK/Britain/England second hand test equipment is expensive because of lack of supply. In my experience the UK electronics industry is small and has low budgets for buying stuff. Stewart of Reading list an HP3312A at £ 175.00 and a Wavetek 185 at £ 150.00. I don't really want to spend money on 20 to 30 year old stuff that could have reliability problems when new equipment (from TTI, not best quality though) isn't that much more expensive.
Thanks for the suggestion of looking at the Wavetek 185 schematic. I have downloaded a copy but it doesn't look very easy to recreate. I only want a limited frequency range and sine only which does simplify the circuit a bit though.

I have used varicap diodes with crystals for frequency trimming and with effort could make up oscillators and a mixer but I am not sure how easy that is.

I might just splash the cash on something new rather than spend a long time on the problem.
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Old 20th June 2012, 03:29 PM   #14
PChi is offline PChi  United Kingdom
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I am just concluding this thread. I have just bought a Thurlby Thandar Instruments TG1000 10 MHz DDS Function Generator. The Sine output at 10 MHz looks pretty clean on the Oscilloscope which is good enough for my requirements. I am using it to measure amplifier open loop gain.
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