12 volt Hour Meter
My new ENM resettable hour meter arrived a few days ago. This new hour meter operates on 4 to 60 volts AC or DC. The reset feature will allow me to zero the meter when it's time to re-tube my power amplifiers. I will operate the meter using one of the 12 volt trigger outputs on the MC2301. My older 120 volt hour meter does not have a reset feature, so this new hour meter will be more useful. It's physical dimensions are identical to the 120 volt hour meter so I was able to use the same Radio Shack PVC work box for my new hour meter. I just had to add the normally-open momentary contact push button to be able to wire and use the reset feature. I used a six foot mono mini plug cable, cutting off one mini plug and using that end of the cable to attach the wires to the meter terminals. I tested the meter and the reset function using a 9 volt battery. It works perfectly. Since my pair of MC2301's now have just over 600 hours on them, I will keep the hour meter connected to the 9 volt battery until the time equals the hours on the amplifiers. After that I will plug the hour meter mini jack into one of the amp's triggered output jacks. This makes it simple to accurately keep track of the hours on power tubes.
http://farm9.staticflickr.com/8352/8...160e9391_z.jpg http://farm9.staticflickr.com/8219/8...0e7f46e7_z.jpg http://farm9.staticflickr.com/8200/8...34edeb95_z.jpg |
That's cool. You would thing these devices would have some internal way of tracking tube usage too.
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Dan... Nicely Done, as always! :ok:
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Quality job Dan and modeling mine after yours.:thumbsup: Thank-you.
I may have gotten a smaller project enclosure and may return it for a larger one now that the button will be incorporated. Just for search purposes, the 6v resettable ENM part # is? Happy Holidays Folks, Bob |
Bob.......The ENM product number is T44F65C. For your reference, the meter is EEPROM based with no battery necessary and operates on 4 to 60 volts AC/DC.
You can barely see it in this photo, but I used a small rubber grommet to pass the mini plug cable through the side of the box, and tied a knot in the cable to keep the cable from being pulled and straining the connections inside. I crimped #14 female terminals on the wires to the meter and soldered the wires to the switch terminals. The N.O. Momentary Contact pushbutton switch is available at Radio Shack, too. http://farm9.staticflickr.com/8491/8...9c7bf151_z.jpg |
Good Job Dan. :thumbsup::thumbsup:
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Call it like I see it. :D
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This hour meter must have an extremely low milliamp draw because I am still on the original 9V battery I connected it to when I began logging hours on the meter. http://farm9.staticflickr.com/8360/8...b38aab6467.jpg |
Looking good Dan. I'll admit, mine is still in the construction stage; I'll get there one day.
Happy New Year, Bob |
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