Hello All. I'm currently working on a project that requires me to use 2 1:16 multiplexers to interface with various peripherals due to limited I/O. I'm curious how much (RC?) filtering would be required to make a short fast pulse (eg. 1-10khz 1-5% duty cycle) a suitable signal to drive a relay. Thanks relay: odd Chinese 20A H-Bridge relay on hooked up via opto-coupler, No other specs multiplexers: CD74HC4067M MCU - 16f690 --=20 Jason White - Python/C++ Programmer and Electronics Hobbyist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .