Ive created a current transformer using an iron core with a primary winding of 4 and a secondary winding of 90.
The primary current varies from 100mA to 13A, but at the moment im doing testing at 100mA-1A in the load (so 4 times this amount)
I get a buzzing sound, quite like an 'angry insect' and the sound gets LOUDER when i increase the load current.
When i remove the secondary from the circuit, the humming dissapears.
This is making me think it is the DC voltage I am producing going back onto the secondary causing the HUM?
The output is passed across a load (4k7) and to a bridge rectifier circuit to produce an analogue voltage connected to my PIC which works fine.
Its just this voltage is causing the humming...
any1 know what I can do or if im even on the right track
The primary current varies from 100mA to 13A, but at the moment im doing testing at 100mA-1A in the load (so 4 times this amount)
I get a buzzing sound, quite like an 'angry insect' and the sound gets LOUDER when i increase the load current.
When i remove the secondary from the circuit, the humming dissapears.
This is making me think it is the DC voltage I am producing going back onto the secondary causing the HUM?
The output is passed across a load (4k7) and to a bridge rectifier circuit to produce an analogue voltage connected to my PIC which works fine.
Its just this voltage is causing the humming...
any1 know what I can do or if im even on the right track