antknee
New Member
Hi,
I have a humidifier circuit board which I wish to adapt for use for use at a different frequency. Currently the circuit operates at 1.6MHz and I wish it to operate at 100KHz. The atomiser, which is mechanical and essentially bubbles off the water, has an equivalent circuit which is LCR in series with a shunt/static capacitance in parallel. So to 'neutralise' this affect and ensure power is delivered correctly the accepted practise is to shunt the atomiser with an inductance either in series or parallel.
Now the resonant frequency (1.66MHz) is determined by F=1/(2Π√(LC)). So I should be able to replace either L or C with a variable component and essentially tune the frequency down to 100KHz.
My question is this - which component do you think it would be best to replace?
I've done some electronics in the past but I wouldn't describe myself as skilled in this field.
I have mapped the circuit board in a picture at the link below. A+ and A- represent the atomiser. There are two inductors, one is marked up like its a resistor at 100ohms. It is an inductor at 100µH (my mistake). There are quite a few capacitors, of those I wouldn't know which was best to replace.
Thanks. I'll reply promptly to thoughts and I hope it's not too difficult a question.
![36V AC atomiser.JPG 36V AC atomiser.JPG](https://www.electro-tech-online.com/data/attachments/32/32575-45735485ad7ab5521aa10e52060b11a0.jpg)
I have a humidifier circuit board which I wish to adapt for use for use at a different frequency. Currently the circuit operates at 1.6MHz and I wish it to operate at 100KHz. The atomiser, which is mechanical and essentially bubbles off the water, has an equivalent circuit which is LCR in series with a shunt/static capacitance in parallel. So to 'neutralise' this affect and ensure power is delivered correctly the accepted practise is to shunt the atomiser with an inductance either in series or parallel.
Now the resonant frequency (1.66MHz) is determined by F=1/(2Π√(LC)). So I should be able to replace either L or C with a variable component and essentially tune the frequency down to 100KHz.
My question is this - which component do you think it would be best to replace?
I've done some electronics in the past but I wouldn't describe myself as skilled in this field.
I have mapped the circuit board in a picture at the link below. A+ and A- represent the atomiser. There are two inductors, one is marked up like its a resistor at 100ohms. It is an inductor at 100µH (my mistake). There are quite a few capacitors, of those I wouldn't know which was best to replace.
Thanks. I'll reply promptly to thoughts and I hope it's not too difficult a question.
![36V AC atomiser.JPG 36V AC atomiser.JPG](https://www.electro-tech-online.com/data/attachments/32/32575-45735485ad7ab5521aa10e52060b11a0.jpg)