[Milsurplus] Another GRC-9 battery idea
Hubert Miller
Kargo_cult at msn.com
Mon Apr 24 19:26:46 EDT 2017
Just thinking out loud here....
Another possibility for the GRC-9 bias batt, that i might try:
a 9 volt battery, with a voltage divider across it to deliver ½ the voltage to the BA-1293/U minus terminal.
My VOM sez 3Q4 grid to ground >20M ohm. I'm thinking of maybe resistors chosen to supply around 5 uA
drain on the batt. The only lower limit on the current, i would think, is the possible stray resistance to ground
from the 3Q4 grid. This would ensure long life, i think, plus being very easy to change out, with a snap connector.
I read that smoke alarms draw "about" 50-70 uA - nobody seemed to know quite specifically - and those things'
batts last a long time. There are also some batts specifically advertised for smoke detector use - Duracell's
"10 Year Battery".
-Hue
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