welshtoast
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- Jan 17, 2022
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I just had a thought... no need to use a 9V battery. The circuitry will work with whatever I throw at it... 9V, 12V, 18V, etc. So how about using a 12V MN21/23 battery in there instead? That's a whole 3V of extra headroom!
One downside is longevity: the average rechargeable 9V rectangular PP3 battery has 600mAh capacity, which would last for 600mAh / 4mA = 150 hours of use (although not really because the voltage would dip too much before being exhausted).
On the other hand, a 12V MN21/23 battery has only 50mAh capacity, which would last 50/4 = 12.5 hours (again, not really). It's long enough for a short set. Good to have options!
Edit: Whatever I do, I should measure the output impedance of the 12V batteries to make sure they're suitable for a dynamic load, such as an audio op-amp. Also, 12V batteries are small and easily paralleled for increased capacity and reduced output impedance (both are desirable).
One downside is longevity: the average rechargeable 9V rectangular PP3 battery has 600mAh capacity, which would last for 600mAh / 4mA = 150 hours of use (although not really because the voltage would dip too much before being exhausted).
On the other hand, a 12V MN21/23 battery has only 50mAh capacity, which would last 50/4 = 12.5 hours (again, not really). It's long enough for a short set. Good to have options!
Edit: Whatever I do, I should measure the output impedance of the 12V batteries to make sure they're suitable for a dynamic load, such as an audio op-amp. Also, 12V batteries are small and easily paralleled for increased capacity and reduced output impedance (both are desirable).
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