hi,

wonder if anyone can help

i need to design and build a latching circuit, but it needs to be lower power consumption!!!


I have a 6v battery and an digital input on another gadet

The circuit needs to latch the input either high or low during alarm (which ever is the most effective re power consumption , or may be it wont make any differeance I don't know)

The circuit will have an alarm input ( a reed switch, normally closed, going normally open on alarm and a reset input. When the alarm is triggered i need it to latch until the reset input is activated.

But the power consumption is a massive issue for me as it needs to operate with as little power consumption as possible.

Thanks for reading and for any advice...

 

Use a CMOS RS latch which consumes little power compared to TTL ones. Use the S input for the reed switch and the R input for the reset button or vice versa.

 

An SCR is also a latch, you can make it with transistors also. Depends on the application. I've use this configuration, it required a push button to break the current when the alarm was on for a manual reset.