Opto Circuits India has taken enabling approval from its board of directors for raising Rs 400 crore under a qualified institutional placement. The company, which makes medical equipment and electronic components, has also taken approval for an issue of warrants to its promoters. It can issue 60 lakh equity warrants to promoters, directors and employees on a preferential basis. Each warrant will fetch one equity share at a price of Rs 210 compared to the current price of Rs 186. Promoters are in a rush to get warrant issues approved.