Steven Everett
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- Sep 23, 2001
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I have a pair of Bach-Simpson larger VU meters that I want to use with a stereo mic preamp that I am building. I bought these meters from a guy in Canada who parts out large mixing boards as sells the parts. I was thinking of using the VU And PPM Audio Metering drive that is on Elliott Sound Products web site.
http://sound.westhost.com/project55.htm
I've read other places that meters aren't standardized. Each company has its own requirements. The meters all read the same at the needle but they vary on how they were designed to be driven.
I disassembled a meter and found the + terminal was connected to a Red resistor. (colors: Green, Brown, Brown, Gold) It's end is connected to a corner of a PC board. The - terminal is connected the opposite corner of the PC board. On this little board are 4 diodes soldered in, what looks to me as, a bridge rectifier. Two points of this bridge rectifier are connected to the input terminals, as I just explained. The other two points of the PC board are connected together through another red resistor. (colors: Brown, Green, Orange, Gold). Can you guys tell what I have by my description?
The meter drive I think resembles what Elliott calls a typical internal simple (cheap) circuit. His claim is there is not much control in this drive. What I am asking you guys is what do you think? I want these meter to work right. Should I remove the drive from the meter and build an Elliott drive or can I just add a pair of wires on the outputs of the microphone preamp, run the + wire through some kind of adjustable resistor, and connect them to the terminals of the meters? I'm assuming the meter was good enough for a pro mixer when it was originally built so it still should?
Thank you,
steve
http://sound.westhost.com/project55.htm
I've read other places that meters aren't standardized. Each company has its own requirements. The meters all read the same at the needle but they vary on how they were designed to be driven.
I disassembled a meter and found the + terminal was connected to a Red resistor. (colors: Green, Brown, Brown, Gold) It's end is connected to a corner of a PC board. The - terminal is connected the opposite corner of the PC board. On this little board are 4 diodes soldered in, what looks to me as, a bridge rectifier. Two points of this bridge rectifier are connected to the input terminals, as I just explained. The other two points of the PC board are connected together through another red resistor. (colors: Brown, Green, Orange, Gold). Can you guys tell what I have by my description?
The meter drive I think resembles what Elliott calls a typical internal simple (cheap) circuit. His claim is there is not much control in this drive. What I am asking you guys is what do you think? I want these meter to work right. Should I remove the drive from the meter and build an Elliott drive or can I just add a pair of wires on the outputs of the microphone preamp, run the + wire through some kind of adjustable resistor, and connect them to the terminals of the meters? I'm assuming the meter was good enough for a pro mixer when it was originally built so it still should?
Thank you,
steve