BillFitzmaurice.info

Ordered a couple of analog meters, they were only a few quid each so I'm not gonna cry if they're not 100% accurate.

If you don't mind me asking, what did you order?

Most meter movements require DC current. If it isn't meant for direct connection to an AC signal, you'll need to add a rectifier and probably a capacitor across the movement to control the ballistics.

Basically this but in 100v format. http://tinyurl.com/lmmvkvf

I fib slightly, the one I picked up is marked AC current but that's what it looks like.

It's hard to say what you're getting. The meter shown in the link is a DC movement, requiring an external rectifier and a little bit of filtering.

If you're getting one scaled in AC Amps, it could possibly be an an iron-vane type movement. If so, you may find it relatively insensitive causing it to draw appreciable current to provide any kind of indication, and the accompanying loading on the speaker line due to the low impedance of the meter. If this is the case, sometimes it will have a high current shunt inside or on the outside of the meter case that can be removed to increase the sensitivity.

Let me know when you have it in hand, and I'll try and help you out.

I bought a LM3914 chip & a bargraph LED yesterday. I'm going to let my son loose with a few components and see what he can come up with

That would be more useful than an analog meter; you can adjust the dwell time to indicate peaks.

While googling about for circuit ideas, I came across this:

http://www.velleman.co.uk/contents/en-uk/p237.html

I'm thinking of getting a few of these after reading this thread:


£3 off eBay: http://www.ebay.co.uk/itm/190837187768? ... 1423.l2649
Perfect 50V scale for my Lab12 T30s. I know they will be next to useless for any practical purpose, but for a few quid, they'll look bloody good. I got lots of oohs and aahs that I got last time I took the rack out when they saw the DEQ/DCX etc. Adding in some voltmeters for the subs would add to that effect. It's not my fault that some people listen with their eyes!! All these processors and meters makes my system look more 'pro' as well, so people will be happy paying more for when they want to hire it out.

I've built the Velleman kit.

Now I've tested it, I'll try to set into a piece of wood. Once I've worked out the best way of doing that, I'll attack the Jack 10 Lite

At first it didn't seem to work, until I realised that the Jack was too loud before we saw any lights!

Wondering if anyone has taken this concept any further? I'm wondering if having one of these http://www.ebay.com/itm/4-wire-Blue-Dig ... XQ1d1THscc would work? I'll state that I do have my iNUKE 3000 dsp set to limit my T24 but somehow having a gauge might be a bit reassuring. I don't have a clue about response time on this (or any other digital meter for that matter) but would this not be the same as me holding my fluke meter on the output of the amp when I test while music is playing only easier?

I have a small power supply in my amp rack for a couple of cooling fans that could easily power the meter.

Thoughts?

northern piper wrote: I don't have a clue about response time on this (or any other digital meter for that matter) but would this not be the same as me holding my fluke meter on the output of the amp when I test while music is playing only easier?

I think that is why the analogue meters would be preferable. With digital meters they are fine for test tones but with music the readings jump all over the place and you would miss the peaks.