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buffalosound
audio school
Joined: 17 Jan 2009
Posts: 6
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 Posted: Tue Dec 20, 2011 3:11 pm Post subject: Akai M8 VU meter circut |
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Hello, I am working on my second pair of M8 preamps. I am trying to get the meter to run without the power tube. I purchased some small audio amps that drive the meter nicely but when I tap on the output of the preamp, the output level is decreased. Can I get these to match up? I know I do not understand these circuits fully, I've learned all I know about tube circuitry from this message board. The link has some info on the meter amp. I would appreciate any insight thanks.
JR
http://s12.photobucket.com/albums/a226/beans25/Akai%20M8/ [/url] |
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Darlington Pair
gettin' sounds
Joined: 03 Jun 2008
Posts: 120
Location: Staunton, VA
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RodC
dead but not forgotten
Joined: 31 Dec 2004
Posts: 2036
Location: Right outside the door
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| Posted: Wed Dec 21, 2011 10:05 am Post subject: Re: Akai M8 VU meter circut |
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| wavley wrote: | | Sounds like the amps don't have a high enough input impedance to not load down the circuit. |
Prob true.
Also, IIRC the meters in these have a pretty large shunt resistor inside, they work on a speaker level output with just a 5K in series. You may have to open up the meter and change it. (This wont solve your impedance issue, just one more thing to keep in mind)
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buffalosound
audio school
Joined: 17 Jan 2009
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RodC
dead but not forgotten
Joined: 31 Dec 2004
Posts: 2036
Location: Right outside the door
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| Posted: Tue Dec 27, 2011 11:20 pm Post subject: Re: Akai M8 VU meter circut |
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I'm not sure, it is for a balanced input. Someone emailed me this circuit and was about to try it out, but I never had a reply about his success. It would be worth a shot.
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'Well, I've been to one world fair, a picnic, and a rodeo, and that's the stupidest thing I ever heard come over a set of earphones'
http://www.beyondsanityproductions.com
http://www.myspace.com/beyondsanity |
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