Hacking a Hobby King volt $3.00 volt meter to read 0-30 volts
Hobby King has a cheap (Less than $3.00) volt meter designed to be installed in RC cars, planes etc to monitor the battery voltage.
Hobby King Volt Meter The range on these meters is 3.2 to 30 Volts DC
They are very popular with the RC crowd and are out of stock all the time. They ship from Hong Kong and take 2-3 weeks to receive. If you order 10 of them shipping is only $2.99 so they are not a bad deal.
I wanted to add these to some small adjustable power supplies that I have that do not have a volt meter built in. But I wanted to read voltages lower than 3.2 volts. The 3.2 volt limit is due to the 7130-1 3 volt low drop out voltage regulator. So I started looking at ways to power this from a source other than the voltage source that is being measured by the meter. I cut the trace of the inout to the 7130-1 voltage regulator and in this example I powered it from a 9 volt battery. When this is installed in my adjustable power supply I will power it from the 5 volt fixed voltage in the supply.
All the details are on my web page at http://wentztech.com/radio/Projects/...VoltMeter.html
Gotta love that Price War facility
I was about to buy a few more of them so its perfect timing.
I put these in pretty much all my models cos they weigh stuff all and give me a quick 'fuel gauge'. They can be mounted so that they are visible from the outside.
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