I suggest you to look carefully into the RC input at pin 5. There may be additional problems.
Try and follow the reference manual from manufacturers of the chip.
For your experiment Reduce the Vs to 15v. Also, for full scale -10v is required at the input and not +10v. Some capacitors value can be change check the datasheet.
Can you suggest me what makes you feel like that?
I do not see a resistor connected to pin 5. You can follow some of the example diagrams given in the datasheet.
Hi,
are you familiar wth microcontrollers?
If yes, then use the ADC and read the input voltage and generate the desired frequency.
Simple task. Needs less parts than your solution. Just some program.
Klaus
I have tried following circuit to convert my 0-10V DC analog voltage to 0-50Hz (24Vpp) using LM331. But I don’t get the desired output. When I try to build the same circuit on breadboard it gives 24V output on the PIN3 for all the range of 0-10V.
View attachment 130669
.
Over the decades, I've built many applications using the LM331 and have never experienced trouble with the circuit itself.
View attachment 130681
Now my question is:
- Is there any problem in this circuit that I should consider?
- What duty cycle will I get? will it be 50%?
- Is it 24Vpp NPN output?
The circuit looks ok.Can you comment on this?
The LM331 is a very robust circuit that has been sold by the tens of millions for over 45 years: it works. You have to follow some basic guidelines, but it will reliably work.
I think circuit is working, as I have checked with LED, but now problem is related to linearity. Unfortunately I have broken my CRO. I just request you to comment on the circuit I have modified.
The circuit looks ok.
If your scope is broken, How can you check V/F linearity if you don't have an instrument to check frequency?
There are many multimeters which include a frequency function.....can you borrow one?
Can you comment on this?
I think circuit is working, as I have checked with LED, but now problem is related to linearity. Unfortunately I have broken my CRO. I just request you to comment on the circuit I have modified.
I guess there is some issue could be there at Current Output & Threshold Input pins.
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