Guest gregfox Posted February 9, 2014 Report Share Posted February 9, 2014 Hello all, I would love some help on a problem I uncounted. The circuit attached is a on – off circuit with low battery cut off and reverse voltage protection. It works just great, that is, almost up to my design voltage of 16.5V. The circuit is designed to allow a rechargeable 14.8V battery (16.8V fully charged) to power a circuit. The circuit only draws 1 or 2 uA and can be powered (almost) forever. If the voltage gets too low the battery could get damaged, thus the low battery turn off, set by Q1,R4,R5 and d3 If turned on at below 13.3 volts, it will stay on up to the input of 16.5 volts. However if the voltage is set at 16.5 volts LED D4 will only flash on and then go out. In other words it will not stay on. The 4013 is rated up to 18V, and I turned down R36 to minimum (towards GND) in an attempt to eliminate it from the circuit. I also bypassed Q2 to eliminate it. The 4013 is a MC14013BDTR2GCan anyone explain why it will only turn on up to 13.5V?Many thanks. Quote Link to comment Share on other sites More sharing options...
login
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.