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rinox 24th December 2005 09:42 AM

Signal generator schematic
2 Attachment(s)
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.

lineup 24th December 2005 01:37 PM

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.

transducer 24th December 2005 01:45 PM

You may be interested in a fuction generator kit that I'm selling:
It's based on the Exar XR2206 chip. All parts are included except for a chassis.


testlab 27th December 2005 03:53 AM

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.

opamp1 18th November 2009 10:50 AM

hi, i have just joined.
I need a signal generator circuit of 5GHz.
Pl help me out.

Steerpike 18th November 2009 09:00 PM


Originally Posted by opamp1 (
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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