Next Image Homemade opto-isolator shrinkwrapped.jpg The DIY opto-isolator should be wrapped with opaque heatshrink to prevent ingress of stray light. Please link to us if you find the information helpful ...<br>TwitterFacebookPinterestDiggLinkedinRedditStumbleUponTumblr An opto-isolator can be home-made in an emergency using components from the junk bins. Please link to us if you find the information helpful ...<br>TwitterFacebookPinterestDiggLinkedinRedditStumbleUponTumblr