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    Passive VU meter circuit

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    Dale Stevens

    Posts : 77
    Join date : 2014-07-06
    Age : 67
    Location : Loris, SC

    Passive VU meter circuit

    Post by Dale Stevens on Fri Sep 26, 2014 4:29 pm

    Can someone give me a circuit running VU meters accross the outputs of the VTA ST120? I have a pair of Armaco meters
    that came from a console of an analog tv station some time ago. Can I use passive components rather than an active driver circuit? Thks for any help/ explanation. Dale

    GP49

    Posts : 718
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    Re: Passive VU meter circuit

    Post by GP49 on Fri Sep 26, 2014 8:49 pm

    Try this:

    http://www.giangrandi.ch/electronics/vu-meter/vu-meter.shtml

    It's a more complex issue than just throwing a meter movement across the amplifier output...read the article and learn why.

    sKiZo

    Posts : 1285
    Join date : 2013-04-01
    Location : Michigan USA

    Re: Passive VU meter circuit

    Post by sKiZo on Fri Sep 26, 2014 10:44 pm

    Dale Stevens wrote: Can someone give me a circuit running VU meters accross the outputs of the VTA ST120?

    Give MW a shout on his build thread ... maybe he can help.

    http://dynacotubeaudio.forumotion.com/t2322-vta-m-125-in-custom-chassis

    Dale Stevens

    Posts : 77
    Join date : 2014-07-06
    Age : 67
    Location : Loris, SC

    Re: Passive VU meter circuit

    Post by Dale Stevens on Sat Oct 11, 2014 4:17 pm

    What is the values of C1 & R2, R3 in GP49's post above? I don't know 4u7?? or 200R. Dale

    arledgsc

    Posts : 330
    Join date : 2012-11-30
    Location : SF Bay CA

    Re: Passive VU meter circuit

    Post by arledgsc on Sun Oct 12, 2014 11:30 am

    Dale Stevens wrote:What is the values of C1 & R2, R3 in GP49's post above? I don't know 4u7?? or 200R.  Dale

    The "R" and "u" take the place of decimal points.  Sometimes schematic capture programs do not like decimal points in names and often component part numbers do not include decimal points as they are easily misread or omitted.   So 200R is a 200 ohm resistor usually with a tolerance of 1%.   20R0 is a 20 ohm resistor.  4u7 is a 4.7 uF electrolytic capacitor.

    Dale Stevens

    Posts : 77
    Join date : 2014-07-06
    Age : 67
    Location : Loris, SC

    Re: Passive VU meter circuit

    Post by Dale Stevens on Tue Oct 14, 2014 5:07 pm

    Thx, everyone; I didn't know all that. On the road again! Dale

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