Hello to all .
Sorry my english.
After finding the DAC NOS dddac1794 (I hope i have made the right choice) now i have to decide which output transformer to use.
the proposed transformer is expensive.
I would like a transformer with the best value for money.
how do you figure out which one is better?
can you compare it from technical data?
can you please advise me?
Sorry my english.
After finding the DAC NOS dddac1794 (I hope i have made the right choice) now i have to decide which output transformer to use.
the proposed transformer is expensive.
I would like a transformer with the best value for money.
how do you figure out which one is better?
can you compare it from technical data?
can you please advise me?
The best value for money is from DIYing your own transformer. You'll need a core - based on my experience of output transformers for DACs I'd suggest something like PQ20/20 or PQ26/25 - depending on how adept you are with handling thin gauge magnet wire.
If you spell out what voltage levels and frequencies you want to handle I'll calculate the wire gauge and number of turns you need. Typically a DAC output transformer goes down to 20Hz but do you need 2VRMS output level? What's the input level?
If you spell out what voltage levels and frequencies you want to handle I'll calculate the wire gauge and number of turns you need. Typically a DAC output transformer goes down to 20Hz but do you need 2VRMS output level? What's the input level?
Lundahl transformers are good but expensive. An alternative would be to find a pair of microphone transformers from an old mixing console. Turns ratio should be between 1:10 and 1:20.
Re: Mic transformers. You might want to stick with Jensen, Lunddahl, Haufe etc. Some mic transformers can be quite colored.
I started a thread about designing input transformers for classD amps here : Designing a classD amp input transformer - step by step guide
The last post there makes most sense:
Nickel Permalloy LE-25 Core and Bobbin for Transformer | eBay
Forget ferrite for audio frequency signal transformers; it is unsuited.
Professional brands would never use it, so why would we and end up with at best a mediocre result? It's a dead end.
Do explain why ferrite is a 'dead end' and why we could only expect a 'mediocre result'. I'm all ears...
Find out yourself by googling a bit about properties of and applications for the different core materials; the info is readily available and I don't have to repeat what is well known.
Try to find those quotes yourself; I don't feel the need to persuade you or prove anything, but only point to well known facts.
My final post here.
Abraxalito, you use ferrite for your signal transformer, it seems because of availability for DIY.
Ferrite is not the best/first choice for signal transformers; there is enough evidence for this to be found, and professional brands like Jensen, Sowter, Cinemag, Lundahl (and humble "me") don use ferrite for signal transformers for obvious reasons (not for any audio transformer by the way).
It is up to you, not me, when you see additional benefits for ferrite cores in audio transformers. It seems it is just price and availability?
Asking me to point out is turning things around.
Good luck with ferrite, the more as well suited cores for signal transformers are available for DIY as well.
Abraxalito, you use ferrite for your signal transformer, it seems because of availability for DIY.
Ferrite is not the best/first choice for signal transformers; there is enough evidence for this to be found, and professional brands like Jensen, Sowter, Cinemag, Lundahl (and humble "me") don use ferrite for signal transformers for obvious reasons (not for any audio transformer by the way).
It is up to you, not me, when you see additional benefits for ferrite cores in audio transformers. It seems it is just price and availability?
Asking me to point out is turning things around.
Good luck with ferrite, the more as well suited cores for signal transformers are available for DIY as well.
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Yes, that's one big reason for using ferrite. The other major one is its cheapness.
Correct up to a point - its not the first choice for manufacturers of signal transformers.
Flexibility for the DIYer to customize the transformer for precisely his/her own needs is the major benefit here beyond low price.
I haven't asked you to point out the suitability of ferrite for DIYers on here, I'm quite capable of doing that myself. Rather, in accord with normal practice in science its for the person making the claims to provide support for them. Just to remind you - the claims you've made here about ferrite transformers are:
1) that they're 'a dead end'
2) that they'll provide 'mediocre results at best'
You've assiduously avoided providing support for those claims, trying to turn the burden of proof around onto me.
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