【Portable Programmable Meter】Hardware is already working

dcexpert

【Portable Programmable Meter】Hardware is already working [Copy link]

 

After several days of debugging, the basic functions of the hardware have been adjusted, and the voltage and current limit can be set. The next step will be to test efficiency, output power, etc.

I found a problem. The inductor I bought this time may not be of good quality. There is an obvious howling sound. I will try another model next time.

nmg

Why does inductance cause a calling sound?

dcexpert

nmg posted on 2022-8-6 15:28 Why can inductance cause calling sounds?

It is not common for this kind of inductor to whistle. The reason is still being analyzed.

se7ens

Can you still hear the whistle when you press the inductor with your hand?

dcexpert

se7ens posted on 2022-8-6 18:28 Can you still hear the whistle when you press the inductor with your hand?

Also, this fully sealed inductor cannot press the coil

吾妻思萌

Howling is resonance, the frequencies just match.

bigbat

Adding a filter capacitor may improve the problem. I once had an inductor whistling due to poor soldering of the capacitor. Later, after the capacitor was soldered properly, the whistling stopped. I thought the inductor was broken. Logically, the inductor should not make any sound. The whistling sound means that the inductor coil is loose.

dcexpert

bigbat posted on 2022-8-7 08:49 Adding a filter capacitor may improve the problem. I once had an inductor whistle due to poor soldering of the capacitor. Later, the capacitor was soldered properly and the whistle stopped. I thought the inductor was broken...

Thanks for the suggestion, I'll try it tomorrow