K&K Audio / Lundahl Transformers

RE: Bellari RP220 mod - LL1530

70.144.137.112

In Reply to: RE: Bellari RP220 mod - LL1530 posted by electricgoose on September 23, 2009 at 07:23:40

My first guess would be that the transformer should be wired as 1:7, which is shown in the LL1530 data sheet at the bottom right. The input side (left side in the data sheet diagram) "+" lead should be connected to XLR pin 2 and the other lead to XLR pin 3. The output side "+" lead should be connected to the input pad on the PC board and the other lead to the PC board ground. You can determine which is ground and which is input using an ohmmeter. Connect one ohmmeter lead to an obvious PC board ground point and then test the two input pads. One should read almost no resistance (that would be ground) and the other should be much higher ( that would be the input).

Kevin Carter
K&K Audio
www.kandkaudio.com

Data Sheet for LL1530 (Open in New Window)

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