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jw0752

AC Optocoupler LTV 814

Posted by jw0752 Top Member Feb 22, 2020
When I used to repair dental chairs it was very common to find a logic circuit communicating with a line voltage triac through an opto-coupler. The chair's actuators were typically 115 Volt AC motors. These opto couplers had an internal LED tied to a light sensitive semiconductor junction that would, when illuminated, fire the triac and allow AC line power to flow to the motor. Until a couple days ago, however, I didn't realize that opto couplers existed that would allow AC line voltage as an in ...
I like to think of the parts and pieces in my shop as building blocks. I very seldom design my creations from the ground up. Like the Borg, I prefer to assimilate technology. Once I have a board or circuit that I find a useful building block I go to work on it and modify it and twist it to my purposes. One of the circuits with which I have had the most fun is a power supply module that was marketed as Hiland Power Supply Module. I do not know who was the original designer. The design has been ta ...
  A while back I bought 8 of these small 0 to 30 Volt 0 to 10 Amp panel meters from China. I like to use them in my builds because they have in the past worked well for my needs and they are very inexpensive. The other day when I needed one for a new project I found the 4 of the 8 would not zero on the Amp Scale. They would say 2, 3, or 4 in the least significant position and this number would add to the actual current that the meter was attempting to read. This put the meter outside the s ...