I need a 10 micron infrared source for some pyroelectric detector testing. Prefer a fairly low-cost approach. I used an incandescent lamp with the glass bulb removed. The driving circuit was a constant current source. This worked - for a week - until the tungsten filament fused.
I need to generate about 100 mA from a 60 Hz source by driving a GFCI grounded-neutral current transformer (in reverse). Neglecting transformer losses, if I use a 250 turn primary and drive it with 400 uA, theoretically, I should be able to extract 100 mA from a single turn secondary (a single...
I have designed an isolated RS232 interface for a PIC16F877 circuit. Isolation is necessary since my circuit is powered from a direct mains regulator (no power transformer). I'm using a MAX232 converter and a couple of 4N35 optoisolators for the TX/RX paths. At 19200 baud, I'm starting to get...
