|QUOTE (Jimsky on rcgoups.com)|
|I have a few Plantraco DSP4-SC combination receiver/ESC in my planes. I really like these aside from one drawback, no low voltage lockout feature. So far no problems, but I'd like something to prevent an overdischarge lipo situation. |
I didn't like the LED style lipo alarms, so I designed what I really wanted: a cheap, lightweight, very loud audible alarm that will tell me without a doubt it's time to land the plane and swap battery packs. Less than 5 bucks of parts and about 20 minutes with a soldering iron you can have one too. I've call this alarm the MicroScream.
I know many say, you will know when" time's up" due to preformance roll off if you don't have an ESC with a low voltage feature. But with this little alarm no need to even think about it. When you hear the alarm, land the plane.
I selected a small 85 decibel piezo alarm, it's pretty darn loud. Just a few simple parts are needed...it's all outlined on the attached schematic. The last one I built weighed only 2.9 grams and I wasn't even trying to do a lightweight build. See the attached photo of it on my scale.
I've tabulated the schematic for a 2 cell and 3 cell version, but there's no reason why it can be modified for additional cell usage.
I've learned a lot here and figured I'd like to give something back. So here you go: print the schematic, order you parts and have fun!