[sdiy] Outside Synth DIY topics but could be of some interest..

[Ben Stuyts]

> On 22 Dec 2021, at 23:25, MTG <grant at musictechnologiesgroup.com> wrote:
> 
> I think Joule Thief is the generic term. Several of my friends were quite annoyed that an "expired" AA lit the LED on a Joule Thief for as long as we cared to watch it (many many hours). They could not fathom why a perfectly good battery (it lit the LED didn't it!?) had to be removed from it's intended application (TV remote) and thrown away.

If I remember correctly, it was similar arguments that were being used for the Batteriser. Which was just a step-up DC/DC converter on top of the battery clip. So you throw away 20% efficiency or so right there.

Joule thiefs (and variants) are not very impressive: Modern LEDs will light up even at 1 mA, 2 V, which is 2 mW. Let’s say in your case it was lit for 5 hours, so the total energy during that time is 5 * 3600 * 0.002 = 36 J. A new AA battery has about 10000 J, so those 5 hours only amount to 1/277 of the initial battery capacity. 

Ben

> GB
> 
> On 12/22/2021 1:53 PM, Ben Stuyts wrote:
>>> On 22 Dec 2021, at 22:31, Brian Willoughby <brianw at audiobanshee.com> wrote:
>>> 
>>> There is at least one company making battery boosters. These are extremely thin brackets that fit around each standard size of battery, and boost the voltage from dying batteries to normal. I'm not sure what kind of supply they use, but they work with most "dead" batteries. A serious advantage is that they work with devices (such as remote controls) where external power jacks are not available.
>> If you are referring to the Batteriser, those have been thoroughly debunked. See https://duckduckgo.com/?q=batteriser+debunk
>> Ben
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