Hello! I have some spare i found that i want to use for a stereo passive DI-box. The first thing is, i would need to mount the transformers somehow. Im all new to this DIY but ive soldered a lot of cables and patchbays a in my days but never "building" any boxes though.
Someone said doublesided tape would do but i would preferable do something more sturdy. Do i need a veroboard or can i do this with something else?
Also, if someone have a good schematic for a passive transformer DI with ground to share so i can start my buildingprocess. The do and donts, It would be very apprecitaded!
Someone said doublesided tape would do but i would preferable do something more sturdy. Do i need a veroboard or can i do this with something else?
Also, if someone have a good schematic for a passive transformer DI with ground to share so i can start my buildingprocess. The do and donts, It would be very apprecitaded!
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Try Covers and PC Boards – K & K Audio here.
I don't know where you are located but kevin has mounting PC boards for almost everything.
Good guy to know.
I don't know where you are located but kevin has mounting PC boards for almost everything.
Good guy to know.
Thanks! Im in the EU though so prefereble finding something here. Its just the transformer mounting issue i have. Just dont know how to think and have the transformers in place since ive never done anything like it before.
I have no pictures how I did to one of my hifi friends. But I glued a little plywood 4mm in the lid then I chose where LL would be marked this drilled two holes on the outside used a wooden stick square that fit between the pins on LL in the square stick I also drilled two holes that match those in the lid, epoxy glued two nuts on the stick.
After that I drilled all the holes in the box after that I mounted everything that would sit there rca and switches then soldered all the cables with the cables hanging out then I hardwired them directly to LL pins I used soft cable with silicone cover that my friend had, finally four feet were put in place.
After that I drilled all the holes in the box after that I mounted everything that would sit there rca and switches then soldered all the cables with the cables hanging out then I hardwired them directly to LL pins I used soft cable with silicone cover that my friend had, finally four feet were put in place.
Try this link. It is to all the LL distributors.
Audio Transformers • Distributors of Lundahl Transformers
Audio Transformers • Distributors of Lundahl Transformers
I don't recommend to solder the transformers onto either veroboard or PCB. At one point in the future you may want to desolder them, which is risky. There are very fine wires soldered to the pins internally. I read a horror story somewhere about internal open circuit due to careless soldering.
I use Lundahls for MC cartridge step-up. What I have done is I mounted them upside down by a drop of silicone adhesive. The pins are wired using point-to-point wiring. I found these transformers are sensitive to external stray magnetic fields that cause audible hum. An aluminium box might not be the the ideal choice (my mistake also). But perhaps your input level is high enough and the turns ratio is low enough so it would not be an issue. Connect the ground pin E to the box, but isolate the input and output signal ground from the box (and from each other).
I use Lundahls for MC cartridge step-up. What I have done is I mounted them upside down by a drop of silicone adhesive. The pins are wired using point-to-point wiring. I found these transformers are sensitive to external stray magnetic fields that cause audible hum. An aluminium box might not be the the ideal choice (my mistake also). But perhaps your input level is high enough and the turns ratio is low enough so it would not be an issue. Connect the ground pin E to the box, but isolate the input and output signal ground from the box (and from each other).
The problem with vero board and pcb is that the holes for pins are too tight so it is not possible to solder them off when you want it as it is better to hardwire. Mistakes by those who design pcb but it almost seems like there is a trend that the holes are a little too small.