[BUILD] fripholm's TG1 Zener Limiter boards - support thread

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wrentema

Member
Joined
Dec 16, 2020
Messages
10
Location
Berlin
It's a nice build indeed. Regarding the front panel, I wouldn't change a thing - looks great :)



Here's a quick tip to reduce hum induced by internal power transformers:

lams.jpg


These are the lams of a 300W power transformer from an old halogen string light that I 'reverse-engineered' a few years ago. The lams are similar to the transformer shields you can buy at e.g. Don Audio. Those work fine but are insanely overpriced IMHO.

I just wrap two or three layers of these lams around my internal power transformer and secure it with electrical tape. Both of my TG units have it as well. Here it is in a 6-channel mic pre that I designed:

wrapped.jpg


Place the transformer as far as possible from audio circuitry, wrap the lams around it and rotate till the hum is gone. HTH
Door noob question (again..). I’m trying to find these lams. but no luck so far. What kind of transformer was this? As in what type..
 

fripholm

Well-known member
Joined
May 26, 2013
Messages
305
Location
DE
It's mentioned in the post you quoted:

... the lams of a 300W power transformer from an old halogen string light ...

But it's really irrelevant what it was used for prior to tearing it apart - the lams of any huge toroidal transformer should work. They just happen to have to correct width and material.
 

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