# one function generator but i want two signals

Discussion in 'General Electronics Chat' started by ninjaman, Sep 2, 2016.

1. ### ninjaman Thread Starter Member

May 18, 2013
307
1
hello,

I have one function generator, i want to get two signals. i thought that making some kind of basic circuit i could get two signals. is there some way of doing this or do i have to get another function generator.

thanks
simon

2. ### Papabravo Expert

Feb 24, 2006
11,156
2,182
It depends on the properties of the two signals. Can you be more specific?

3. ### ninjaman Thread Starter Member

May 18, 2013
307
1
just two sine waves really. nothing special.
this video by w2aew shows the stuff i want to do.

4. ### ericgibbs AAC Fanatic!

Jan 29, 2010
3,326
592
hi,
This simple circuit will give a phase shift for sine waves for say Lissajous traces.
Tweak the values of C1 for different frequencies.
E

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5. ### OBW0549 Well-Known Member

Mar 2, 2015
1,879
1,536
If all you want to do is play with Lissajous figures on your scope, just use the power line (through a stepdown transformer, of course) as the second sine wave.

Apr 5, 2008
17,141
3,009
Hello,

The shown figure has a certain phase shift between the two sine wave signals:

Bertus

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7. ### BR-549 Distinguished Member

Sep 22, 2013
3,073
748
You can use various gates , counters and flipflops to divide your signal generator into many frequencies. Low pass filters can smooth the squares. But one can never have enough generators.

The x-y vector mode is a great un-used tool, both for work and instruction. You will not regret studying this.
After getting familiar with the patterns, I highly recommend building an octopus.

Search google---oscilloscope octopus--- for many examples.

You can watch and adjust the phase angle in circuits, by watching the vectors. One can easily judge the quality of in circuit components (un-powered). You can easily see the gates, or should I say junctions of solid state devices. One can quickly evaluate the Q of a coil or cap.

They should use this when teaching vectors. It shows rotation.

8. ### ian field AAC Fanatic!

Oct 27, 2012
5,557
984
Looks like all you need is a variable phase shifter, and maybe some amplification to cover losses.

I was wondering if Google is broken again.................

Sep 13, 2015
2,196
421
fairly easy.

10. ### crutschow Expert

Mar 14, 2008
16,545
4,459
Here's an interesting circuit for generating phase shifts.
It's an All-Pass filter which can generate phase shifts over a near 180° variation with no change in output amplitude for either adjusting the phase or changing the frequency.
At high frequencies, well above the corner frequency where the capacitor looks like a short, the phase shift is near 0° (the circuit looks like a follower).
At low frequencies, well below the corner frequency where the capacitor looks like an open, the phase shift is near 180° (the circuit looks like a gain of one inverter).

• ###### All Pass Filter.asc
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11. ### SLK001 Senior Member

Nov 29, 2011
1,029
358
That reminds me... I have \$1 but I want \$2.

12. ### shteii01 AAC Fanatic!

Feb 19, 2010
3,974
617
bleach it and print 2 on it