![]() This arrangement effectively linearizes the signal. The gain of the op-amp is influenced by the signal fed back from inside the opto-coupler, and adjust the drive to the opto-coupler accordingly. ![]() The first section is the input side of the opto-isolator, and includes a 7805 voltage regulator and and op-amp OPA1641. The circuit is divided into three sections. The windings are isolated from each other. The device consists of an dual wound toroidal transformer providing 2x15Vac. The I元00 is an opto-coupler that has an additional feedback photodiode that allows a sample of the internal LED flux to be measured and used to compensate for the non linear characteristics if the opto-coupler. I started looking at alternate ways to electrically isolate line level audio signals, and I came across the I元00 by Vishay. I wanted to avoid using transformers to achieve a more flat frequency response. The normal solution to eliminating hum if the earthing cannot be arrange in a suitable way would be to place audio isolating transformers in the line level signals. Normally an audio system will be set up in such a way that all earthing comes back to a common star point. ![]() Because powered speakers can be plugged into any electrical outlets in the house, it is not possible to know the layout of the earthing system to ensure that mains hum is not introduced. I had built a set of powered speakers but I was having problems with mains hum and noise. ![]()
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