From the make flickr photo pool flickr member kc7fys built this fine little voltage meter to indicate battery level using a bi-color led and an lm358 op-am. Bill porter built this excellent diy power meter to monitor the electricity usage of his home.. Introduction: diy amp / watt hour volt meter so we designed a voltage divider that would provide 5v at 20v battery voltage, and less at various lower voltages..
Accurate lc meter build your own accurate lc meter (capacitance inductance meter) and start making your own coils and inductors. this lc meter allows to measure incredibly small inductances making it perfect tool for making all types of rf coils and inductors.. This is diy digital voltmeter panel meter 0-50v is 0-50v scale. display with led 7 segment. in cost 3$ dollar only, builds simple regulator dc power supply. A home-built ebike battery pack from 18650 cells. using a diy lithum battery pack also takes a lot of the “digital read” is just a battery meter installed.
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