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Old 22nd March 2006, 04:13 PM   #1
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Default Wiring Digital Volt Meter

Q1: What would be the best place to wire this? I am looking to wire in whatever place fluctuates the most although I am not expecting a "light show"!

Q2: Has anyone used this model? I am not exactly sure where to make my connections. I may have to use trial and error and hope I don't burn it out!

http://cgi.ebay.com/ws/eBayISAPI.dll...EWA%3APIC&rd=1

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Dominick
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Old 24th March 2006, 02:08 AM   #2
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Good question as I was wanting to use one as well
If you want to use this to show some type of reference to watts, I'm not 100%, but you don't want to use this b/c it is DC volts. After you rectify it, your volts should be constsant. It's current you are after. Your chip will always need/use the (25V *1.41) 30volts but it will draw more current when you play it louder or when the bass hits.

If you want to just show DC volts then it will work. I would hook it up after the tranny or after the PS before the chip. See if it makes a diff in the sound...

Hopefully someone else with more knowledge than I can set us both straight
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Old 24th March 2006, 06:03 AM   #3
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i have some similar to those but red. be very careful about powering them. they release the smoke very easilly!

you could monitor the power supply voltage.

you could use it as a volume display if you had a voltage controlled preamp such as the kookaburra.

you can get LM35 chips and turn them into temperature monitors.
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Old 24th March 2006, 01:03 PM   #4
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Thanks for the suggestions neutron.

I did figure them out altough I toasted one in the prcess. LOL-the pains of learning!

Anyway, it raised some questions.

I hooked up the voltage reading inputs to the output capacitor leads.

I am using a 22V 400 VA, but I am getting readings in the low to mid 30's?????

How is this possible?

Also, The voltage fluctucated as many as 3-5 volts when the amp has no input signal attached hence there is 0 output! shouldnt the voltage be fairly stable only fluctuating a few tenths of a volt at most???

Thanks,
Dominick
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Old 25th March 2006, 12:41 PM   #5
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Quote:
Originally posted by Dominick22
Thanks for the suggestions neutron.


I hooked up the voltage reading inputs to the output capacitor leads.

I am using a 22V 400 VA, but I am getting readings in the low to mid 30's?????

How is this possible?
Voltage peak after caps.

Quote:
Originally posted by Dominick22
o, The voltage fluctucated as many as 3-5 volts when the amp has no input signal attached hence there is 0 output! shouldnt the voltage be fairly stable only fluctuating a few tenths of a volt at most???
Is the voltage stable,when you use a DMM to measure voltage?
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Old 26th March 2006, 09:35 PM   #6
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I tested the voltage on the output caps and they were all stable.
They were at 78.5 give or take 1 volt. I saw slight flucuations (.1-.2), but the volt meter is still jumping around 3 to 5 volts continuously!!
It is driving me nuts and with this flucuation, there is no point in using it!

What do you think??

Dominick
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Old 27th March 2006, 03:08 AM   #7
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is your meter common ground or independant power supply version?
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Old 27th March 2006, 04:09 AM   #8
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Uh, honestly, I do not know the difference. Everything runs perfectly with no static so I know it has a good ground.

As far as I know all ground go to the earth ground on the power cord.

Hope this helps Neutron,
Dominick
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Old 27th March 2006, 04:54 AM   #9
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well i think mine is a different brand. it uses surface mount chips instead of that huge one.

did you measure the voltage with a multimeter at the same time as the panel meter was fluctuating? and did you try measuring a battery with it just to be sure it is not faulty.
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Old 27th March 2006, 02:27 PM   #10
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Good idea with the battery--I will try that!

I tested with the DMM and the volt meter seperatly but one right after the other. We are talking seconds here. And I ran the test on all 4 caps.

Thanks for the battery tip neutron--I will try that tonight!

Dominick
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