Brillie Battery life expectancy to run slave clock

Timothy Momany

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Feb 12, 2014
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Hello,
I’m new to the forum. I have a Brillie slave clock running off a Brillie master clock. I am using a couple AA batteries in parallel. It seems this set up only powers the slave for about a month ( haven’t actually kept notes). Does this seem like an inordinately short battery life? I am wondering if I have a very low current drain somewhere. Thinking of beefing up to parallel Cs but only if I can be sure I don’t have another issue. I am not electrically inclined, any help would be most appreciated.
Tim M.
 

Ale2020

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Jun 27, 2020
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Hola!! tuviste alguna respuesta? yo tengo algunas inquietudes, saludos!!
 

Tim Orr

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Good evening, Tim!

Just a bonehead idea here, but I just weighed 2 AAs, 1 C, and 1 D: 48 g, 67 g, 138 g. I would bet that one D would have roughly 3x the capacity of the 2 AAs and twice the capacity of a C. If there's a place you can fit it, I suspect a D would be much better, not just for the added capacity, but also because electronics people tell me that running batteries in parallel is sometimes troublesome: If the internal resistance isn't the same, one battery tries to charge the other, diminishing the effectiveness of both.

Someone else better at electricity can no doubt correct me.

Now, if what you need is actually 3 volts, you'd want series.

But this idea might be worth a try.

Best regards!

Tim Orr
 
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Ale2020

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[QUOTE = "Tim Orr, publicación: 1380625, miembro: 7919"] ¡Buenas tardes, Tim!

Solo una idea descabellada aquí, pero solo pesé 2 AA, 1 C y 1 D: 48 g, 67 g, 138 g. Apuesto a que una D tendría aproximadamente 3 veces la capacidad de las 2 AA y el doble de la capacidad de una C. Si hay un lugar en el que pueda caber, sospecho que una D sería mucho mejor, no solo por la capacidad adicional, sino también porque la gente de la electrónica me dice que hacer funcionar las baterías en paralelo a veces es problemático: si la resistencia interna no es la misma, una batería intenta cargar la otra, disminuyendo la efectividad de ambas.

Sin duda, alguien mejor en electricidad puede corregirme.

Ahora, si lo que necesitas es en realidad 3 voltios, querrás series.

Pero esta idea podría valer la pena intentarlo.

¡Atentamente!

Tim Orr [/ CITA]
¡¡Buenas tardes !!, muchas gracias por la pronta respuesta y colaboración, en este momento también estoy procesando información valiosa que me envió otro miembro, muchas gracias por la predisposición nuevamente, quedando a su disposición le envío un saludo afectuoso !
 

Tim Orr

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Good evening!

More info on batteries. According to: Battery Capacity

The mAh ratings for batteries in question are:

AA: 2400
C: 6000
D: 13000

So, 2 AA batteries could be expected to provide 4800 mAh. A single C-cell would provide about 25 percent more than 2 AAs.
A D-cell would provide 271 percent more than the 2 AAs.

Best regards!

Tim Orr
 
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Ale2020

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Good evening!

More info on batteries. According to: Battery Capacity

The mAh ratings for batteries in question are:

AA: 2400
C: 6000
D: 13000

So, 2 AA batteries could be expected to provide 4800 mAh. A single C-cell would provide about 25 percent more than 2 AAs.
A D-cell would provide 271 percent more than the 2 AAs.

Best regards!

Tim Orr
Thank you very much !!, with the information provided I have come to the conclusion of the convenience of feeding it with a D-type battery, Best regards !!
 

John UK

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Mar 25, 2006
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The Brillie can use batteries heavily in the slave circuit - mainly because compared to many other systems where the electrical pulse is short (e.g Synchronome and Gents slave systems), the impulse is a whole second long. However - the current need is quite low. I would suggest that you add a series resistor to reduce the current. Unfortunately, I don't know a 'correct' value for the current, but trial will see how low you can reliably use. Distant memory (I ran a Brillie with two slaves - with a single D cell for the slaves, but have not had the slaves in circuit for a long time) makes me think that about 50 mA was possible, but I may be wrong there.
It has also been suggested that adding a suitable (fairly large) capacitor in series with the battery would shorten the pulse and reduce battery drain; I have not tried this, but it sounds feasible.
 
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