on the coil there is a little mirror and it will reflect the light beam to the front.
Because there is no needle this is a very quick system fasten than every normal Vu-meter.
Normally you need the vintage TAB U70 amplifier.
Have lot of these meters so will try your board once.
regards Ronald
Ok I had a look at the U70 and it does the rectifying and attack and release setting and runs the meter on about 150v rail so looks like there is just a coil of wire in meter.
Does the light run separately? Does it have any voltage current of wattage markings on the lamp?
If you had a couple of photos inside would give me a clue and if you could measure the ohms between the 2 coil wires this would give me an idea on how to get these running on the VU buffer?
Already received the package that's reaqlly quick.
Think it will not work because 0db = 1,445ma and -50db = 3,345ma is will see.
Else buy two normal Vu-meters.
Already received the package that's reaqlly quick.
Think it will not work because 0db = 1,445ma and -50db = 3,345ma is will see.
Else buy two normal Vu-meters.
Regards Ronald
OK I see you think the meter drive is actually reversed?
Let me know if this is the case as there is probably a way around this by adding a dc bias resistor to pull the meter down to -50dB.
If your currents are current a 3.3k resistor in series with a 1k trim pot wired to +12vdc should allow you to set the meter to -50dB (actually best to set to the 0% marker) without the VU2 connected.
Then the VU2 output would be wired reversed to cancel this current so the meter would work like a normal meter.
I got the kit, but am wondering re. using it with a vintage Weston Vu meter... it needs to be fed 6V for the lamps, not 12V.
What to do?
Thanks!
Tom
HI Tom for 6v lamps that cannot be changed easily. Run the 2 x 6v lamps in series from 12v.
So 0v to one meter lamp and 12v to other meter lamp and connect the spare terminal on each meter together.
This makes one 12v lamp as long the 2 bulbs are the same mA.
Best to run these directly from the 12v power supply due to the high current and just cut off the extra wires on the 4 pin wired plugs that are not used
I won´t be usuing the said vu meters, so I designed a new panel with new lampholders behind the meters, they are just like the Fender amps, so 12V lamps are avail...
The question is what mA / watt is suitable for the bufferkit...
I won´t be usuing the said vu meters, so I designed a new panel with new lampholders behind the meters, they are just like the Fender amps, so 12V lamps are avail...
The question is what mA / watt is suitable for the bufferkit...
Best,
Tom
The VU2 kit just passes the lamp power via the RLAMP resistor so if you fit 0ohm links the VU2 doesn't care what wattage you use.
We usually fit 10R for RLamp to give the lamps soft start for longer life. What ever the recommended bulbs are for the meters should be fine.
Hi,
I connected the unbalanced input to the speaker. The amp goes to max 15Vrms.
How do I decrease input sensitivity? Right now at lowest input sensitivity I measure -2dB for an input of about 5.6Vrms
Thanks,
Radu
Abszero wrote:Hi,
I connected the unbalanced input to the speaker. The amp goes to max 15Vrms.
How do I decrease input sensitivity? Right now at lowest input sensitivity I measure -2dB for an input of about 5.6Vrms
Thanks,
Radu
Have you turned the 25 turn trim pot fully down as 15vrms should not be a problem?
Also if is often easier to link the VU buffer across the amp input as once calibrated it is no different to connecting to the amp output.
If running very high levels into the VU buffer then all that is needed is a series resistor from the amp output to the VU Buffer input like 100k etc
or wire 10k trim pot as a volume pot to the input of the VU Buffer.