I just Trying to say you that I Made your modification on post NO 33, but U8 and its pot (R21) just change the amplitude of the output (i.e the amplitude of the waveforms),
I tried it on Protues software and then in real by my real components, And I have to tell that U8 And R21 are in a configuration so that change the amplitude, They do not change the DC OFFSET a tall! Any solution?
I just Trying to say you that I Made your modification on post NO 33, but U8 and its pot (R21) just change the amplitude of the output (i.e the amplitude of the waveforms),
I tried it on Protues software and then in real by my real components, And I have to tell that U8 And R21 are in a configuration so that change the amplitude, They do not change the DC OFFSET a tall! Any solution?
hi,
There will be some interaction with R21 and the Gain of U8, you will need to adjust R23/24 10Kpot to compensate. I was trying to keep the component count as low as possible.
If you want a high specification Function Gen it would require a complete redesign and more high spec components.
Varying R21 should change the DC offset of the output waveform.
You do realise that as you have a single supply to the OPA's that the output waveform will always be above 0V.?
I will look at your circuit..
EDIT:
Look at these images, R21 = 5K and 40K , observe the DC shift on Vout.
EDIT2:
I see you are using a 18V supply, the original circuit from the web says 9V.??
I used 12V for my sims, I will retry at 18V
The funny-looking waveform is something like a sine-wave? With about 40% distortion?
Years ago I made a function generator with an ICL8038 IC and its sine-wave also looked funny. Its distortion was audible at 1%.
The funny-looking waveform is something like a sine-wave? With about 40% distortion?
Years ago I made a function generator with an ICL8038 IC and its sine-wave also looked funny. Its distortion was audible at 1%.
hi agu,
Its not my circuit.
I have advised the OP that the circuit is very limited, I would use a dedicated FG IC.
I cannot make a silk purse out of a sow's ear.