Recent content by kal22

What causes relay chattering and what can be done to prevent it?

I have a design issue. I've programmed a CPLD so that it controls whether a MIC can activate or not. There are 8 MICs. A MIC is allowed to activate if there are no opens nor shorts on its lines. Each MIC has 4 wires (red, black, white, green). The red and black wires are for the...

yes, each mic has a push-to-talk button. so far, what I've thought of is connecting an XOR gate to the latch enable input. i'd have the same 8 mic inputs going into the XOR gate as the ones going into the D inputs of the latch. i'd also have some kind of delay before the 8 D inputs, so...

Well, according to the function table for the 74HCT573 octal d-type transparent latch, whenever the latch enable input goes high, the Q outputs will follow the D inputs. For this project, a D input will be high if that particular mic has been keyed. More than one mic can be keyed at a...

It's a small part of a project. I need to trip the relay of the 1st mic that's keyed and make sure that the other ones don't activate as long as 1st still has control of the output. I'm not sure how to get started. Any ideas?

How would I use an octal d-type transparent latch along with other logic to control 8 mics on a first-come-first-serve basis? There are 8 input mics and 1 output mic. Only 1 input mic can be used at a time. If a 2nd mic is keyed, I do not want it to take away control from the 1st mic in use.