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Old 24th December 2005, 09:42 AM   #1
rinox is offline rinox  Italy
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Default Signal generator schematic

HI... in attachment a simple signal generator schematic based on MAX038 (available also as free sample from Maxim).
I found the schematic on the web but I substituted the output buffer IC with something more simple to find (LF357 instead of EL2001 wich is hard to find for me).
Note: Fine - Coarse - Level are 1K Lin Pot
Hope you'll find this usefull.... I had no time to make a board, but if someone want to help me, I will post schematic in eagle (.sch) format.
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Old 24th December 2005, 01:37 PM   #2
lineup is offline lineup  Sweden
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Yes, useful.
Can be used to test amplifiers.

If one does not have oscilloscope but a true AC voltmeter
one can test at different frequencies/levels
and try to hear when things begin to get bad.

Do some changes and see if better or worse.
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Old 24th December 2005, 01:45 PM   #3
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You may be interested in a fuction generator kit that I'm selling:
FS: 100kHz Function Generator kit
It's based on the Exar XR2206 chip. All parts are included except for a chassis.

Cheers,
Ron
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Old 27th December 2005, 03:53 AM   #4
testlab is offline testlab  United States
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The Analog Devices SSM-2135 would be a good choice for the output buffer. It has lots of guts. I used it to make a headphone amp for my AKG 240 cans.

If you need more drive than that, run a series resistor of about 100 ohms, from the output of the buffer. Then, put a complementary pair of transistors on the output. Simply connect the bases of the transistors to the output pin of the chip and , connect the emitters on the other side of the resistor. The collectors go to their respective supply rails.

You can use 2N3904/3906 pair or, for more heft, 2n2905/3019.
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Old 18th November 2009, 10:50 AM   #5
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hi, i have just joined.
I need a signal generator circuit of 5GHz.
Pl help me out.
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Old 18th November 2009, 09:00 PM   #6
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Quote:
Originally Posted by opamp1 View Post
I need a signal generator circuit of 5GHz.
Five GIGAHertz??? At those sorts of frequencies all kinds of weird things happen, 'normal' circuit boards and components don't work. It's a topic of study all on its own, the area of magicians and RF experts.
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