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Old 15th February 2003, 10:59 AM   #11
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Quote:
Originally posted by sangram
Rod Elliot has one on his site - fully automatic.
That won't help in fmak's case. He said "My probelm with lead batteries is leaving the units on and discharging/ruining the whole thing."

Rod's charger senses current and DISENGAGES the charger when the unit being powered is turned on and draws current. So if fmak leaves his preamp on, Rod's circuit wouldn't engage the charger until the batteries were pretty much dead and no longer able to deliver current above whatever threshold was set.

se
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Old 15th February 2003, 11:05 AM   #12
sangram is online now sangram  India
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Quote:
Originally posted by Steve Eddy


That won't help in fmak's case. He said "My probelm with lead batteries is leaving the units on and discharging/ruining the whole thing."

Rod's charger senses current and DISENGAGES the charger when the unit being powered is turned on and draws current. So if fmak leaves his preamp on, Rod's circuit wouldn't engage the charger until the batteries were pretty much dead and no longer able to deliver current above whatever threshold was set.

se





Sorry, saw that late. Maybe the current sense can be retuned so that recharging happens at only idle current (whatever the quiescent current value is), maybe a small timer would help to not have the charger switch on between songs (10k/2000 uf?) or while changing CDs...
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Old 15th February 2003, 07:56 PM   #13
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Quote:
Originally posted by sangram
Sorry, saw that late. Maybe the current sense can be retuned so that recharging happens at only idle current (whatever the quiescent current value is), maybe a small timer would help to not have the charger switch on between songs (10k/2000 uf?) or while changing CDs...
Sure. But ultimately I still don't see it as needing to be any more complicated than a simple switch.

The way I read his comment, it's not like he's too lazy or forgetful. He just wants to keep the preamp powered up when he's not using it and instead of having that drain down the batteries, he wants something that would kick in at a certain time and keep the batteries topped up.

That being the case, all he really needs is a simple multipole switch that engages the charger when he's not listening. The preamp would still remain connected to the batteries so it would ultimately always be "on." You'd just have to remember to flip the switch when you were done listening.

se
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Old 15th February 2003, 08:42 PM   #14
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[QUOTE]Originally posted by Steve Eddy
[B]

Sure. But ultimately I still don't see it as needing to be any more complicated than a simple switch.

The way I read his comment, it's not like he's too lazy or forgetful.
------------------------------------

Actually, my problem is that I forget. A switch doen't help. I need a trickle charger when the voltage drops below, say, +-10V.
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Old 15th February 2003, 09:14 PM   #15
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Quote:
Originally posted by fmak
Actually, my problem is that I forget. A switch doen't help. I need a trickle charger when the voltage drops below, say, +-10V.
Ah...

Hmmmm. Well that's a bit more complicated. A simple comparator could detect when you get down to +/- 10 volts, but once the charger kicks in, you'd be above the threshold and it would just disengage. So you'd need another comparator to monitor the current flowing from the charger. The outputs of the two comparators would then feed a logic circuit to determine when to engage and disengage the charger.

Hmmmm...



Ok, how 'bout a simple switch AND a string to tie around your finger to remind you to turn the charger on?

se
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