alexfayer wrote: ↑Sat Oct 10, 2020 12:22 am
If I calculated correctly the transformer lolol2 mentioned from Conrad has a winding ratio of 1:61 in the configuration I posted(4ohm and 0.625W) and 1:42 with 4ohm and 1.25W. To achieve a 1:15 ratio we would need to select 8ohm and 5W.
Datasheet of this transformer:
datenblatt-516104-elma-tt-iz-1892-impedanz-4-16-primaerspannung-100-v-inhalt-1-st.pdf
Is this correct?
Correct. You get this values if you use the winding numbers in line 4.3 of datasheet. Winding assignment is guessed correctly (datasheet keeps that in secret), because the ratios (r) i get from the power (P) and impedance (X_s) ratings neglecting the loss are very similar: 63, 45 and 16 (formula is r=100V/sqrt(X_s*P) )
According to the ratings the transformer is quite efficient at a frequency which is kept in secret too. But from the user comments on the products page one learns, that this transformer works well for audio frequencies ...
Looking at the 1:10 transformer you posted from Reichelt I wish I never ordered the one from Conrad.
I think the transformer from Conrad isn't bad. It's just a little bit unhandy and the documentation is obscure.
ZeeWW wrote: ↑Sat Oct 10, 2020 8:04 am
@alexfayer can I make a request that when you do write a noob guide, and that would be awesome, can you please limit the amount of soldering used? I have taken on to using the Wago 221 clips as Lolo2 uses and the are fantastic, easy to use and reduces soldering.
The components I use cannot be connected safely with such clips and you probably don't want to repair it during Esim session.
Another option are crimp contacts. But soldering is IMHO easier.
For private purposes, use the good old SN60PB40 solder with flux core. Unless you eat it all characteristics are better than that of typical lead free solder.
It should also be mentioned that stainless steel can be soldered easily with the right flux (DIY electrodes).