Ad VU meter api 312

[mahoule]

Hello to you !
I would like to add a VU meter on my 312 api on which output transformer tap or 2520 out and which opamp for vu meter Thank you and good day
Marc

 

[Rybow]

When I did mine I used the 34mm VU meter and VU buffer kits from JLM audio. Easy peasy lemon squeezy.

 

[djmiggymigz]

we're back!! I Love reactivating old threads lol.

Working on the same thing here. Just want to confirm, are the 2 unused output transformer leads (Vio/Gry) what would be routed to the VU meter inputs? I'm currently looking at the JLM 34mm VU as well as their buffer circuit.

 

[Walrus]

Yes, you can use that spare winding, but as the transformer is a 1:1:1:1 ratio and you are joining 2 of the windings in series for the output (1:2 step up),
the spare Violet Gray winding will only show half the level of the actual output.
I've not looked, can the JLM buffer board be adjusted enough to correct for this?