Reply To: Input transformer as injection transformer suggestion

[Darko ObretanParticipant]

Hi Michael,

Thank you, I was searching a bit more and find few transformer sources, but such transformers are really expensive and don't go that low either.

I mainly need it for galvanic isolation between measurement equipment and different electronic devices. I intended to use one as injection transformer for switching power supply feedback loop response measurement (I would inject error signal over this transformer and measure how long does power supply take to react and stabilize after that).

The other use would be to hook it up between function generator and various circuits (audio or other) to avoid ground loops.

I was thinking about your suggestion and active circuit would also suit my needs if I power it from battery and isolate its input with optocoupler and linearize it. The only downside I see is some additional noise (which could be really low with certain OPAMPs) and some small DC offset which could be also removed.

I think I can build really good active circuit for the price I would need to pay for transformer that goes down to ~10Hz (which is around 300USD here http://www.trafco.rs/tubeaudio.php).

Thank you for suggestion! Do you have any specific active circuit in mind?

Regards, Darko

• This reply was modified 3 years ago by Darko Obretan.
• This reply was modified 3 years ago by Darko Obretan.
• This reply was modified 3 years ago by Darko Obretan.
• This reply was modified 3 years ago by Darko Obretan.
• This reply was modified 3 years ago by Darko Obretan.
• This reply was modified 3 years ago by Darko Obretan.
• This reply was modified 3 years ago by Darko Obretan.