Hi, Im in need of some advice to implement the Lundahl LL1524. As part of my restoration of many Harrison 32C channelstrips I want to use the original parts (the PC1040 plug on microphone card) to build a 4ch preamp, with REV, PAD, Phantom and the HPF circuit. I have also some (recup) Lundahls LL1524 I would like to add to make the line out transformer balanced. These types are suited for line out balanced drive as stated in the info from Lundahl. But not much examples to find of schematics. Is there a way I can use them passive? Or is the use of a mixed feedback circuit essential for proper function?
This is passive? :
Screenshot 2021-12-07 at 20.06.48 | Passive LL1524 | Twosounds | Flickr
then this is the active balanced mixed feedback :
Screenshot 2021-12-07 at 20.11.19 | Balanced drive LL1524 | Flickr
This is an example of the transformer Line driver of the Harrison 32C :
A push pull configuration with unbalanced mixed feedback drive?
Screenshot 2021-12-07 at 20.15.09 | Harrison Line driver | Twosounds | Flickr
This is passive? :
Screenshot 2021-12-07 at 20.06.48 | Passive LL1524 | Twosounds | Flickr
then this is the active balanced mixed feedback :
Screenshot 2021-12-07 at 20.11.19 | Balanced drive LL1524 | Flickr
This is an example of the transformer Line driver of the Harrison 32C :
A push pull configuration with unbalanced mixed feedback drive?
Screenshot 2021-12-07 at 20.15.09 | Harrison Line driver | Twosounds | Flickr