We get a lot of power outages here, especially during the winter months. So I made a battery pack for one of my LED microscopes using an 18650 battery and charger. I was afraid that 4.2 volts would be too high for the LED bulb so I placed at 35 watt halogen bulb in series line with the battery pack to reduce the voltage. It works well and I won't be interupted again because of power outages. When I plug it in to AC voltage it will still charges the battery. I thought it was a good idea and wanted to share this info.
The LED light looks about right so far as intensity is concerned.
Greg
battery pack
-
- Posts: 1186
- Joined: Tue Oct 20, 2020 6:44 am
battery pack
- Attachments
-
- battery pack.jpg (34.93 KiB) Viewed 1644 times
Re: battery pack
Hi Greg,
very good idea! For bright field LED use there is not much power needed anyway.
Many of these 18650 lithium ion batteries on the market are fakes: Capacities of 5x the possible maximum but inside only a little battery connected with wires to the poles . Easy check: A proper 18650 weighs about 50g.
Bob
very good idea! For bright field LED use there is not much power needed anyway.
Many of these 18650 lithium ion batteries on the market are fakes: Capacities of 5x the possible maximum but inside only a little battery connected with wires to the poles . Easy check: A proper 18650 weighs about 50g.
Bob
Re: battery pack
I can imagine the frustration of an outage after preping wet slides for a session. Good idea Greg.
-
- Posts: 1186
- Joined: Tue Oct 20, 2020 6:44 am
Re: battery pack
Last night I added a 0-1500 ohm potentiometer which gives excellent control over lighting intensity.
Greg
Greg
- Attachments
-
- potentiometer added.jpg (38.18 KiB) Viewed 1599 times