Duocast Transformer

[Devoureddeth]

I know let in terms of transformer use for this pedal. Unfortunately Mouser is out of TY-141P but I have some 42TM018-RC transformers which are also 10K/10K. However it's resistance is 550/500 (primary/secondary) compared to the recommended which is 820/1070(P/S). Two questions does the resistance matter here, and which pins should be for primary on the board? Thanks!

 

[Cybercow]

I know let in terms of transformer use for this pedal. Unfortunately Mouser is out of TY-141P but I have some 42TM018-RC transformers which are also 10K/10K. However it's resistance is 550/500 (primary/secondary) compared to the recommended which is 820/1070(P/S). Two questions does the resistance matter here, and which pins should be for primary on the board? Thanks!

Actually, the 42TM018 is a 7K\10K (P\S) transformer. (See the accompanying chart. Note that the 42TLxxx series is electronically identical to the 42TMxxx series. The "L" series is just a smaller form factor the slightly larger "M" series.)


Mouser currently has the 42TL218-RC in stock. Link: Mouser 42TL218-RC

As far as the measure resistance goes, that is not as important as the "impedance". Impedance is the more crucial factor. And when both the Primary and Secondary impedances are equal, the P\S orientation is not important.

Hope this helps.

 

[Devoureddeth]

Thanks Cybercow, very useful information I will order one of the smaller versions next Mouser order.
Cheers,

DD

 

[rossbalch]

Actually, the 42TM018 is a 7K\10K (P\S) transformer. (See the accompanying chart. Note that the 42TLxxx series is electronically identical to the 42TMxxx series. The "L" series is just a smaller form factor the slightly larger "M" series.)
View attachment 6451

Mouser currently has the 42TL218-RC in stock. Link: Mouser 42TL218-RC

As far as the measure resistance goes, that is not as important as the "impedance". Impedance is the more crucial factor. And when both the Primary and Secondary impedances are equal, the P\S orientation is not important.

Hope this helps.

Sorry to necro this I guess, but I thought I would mention that the TL and TM series use different core sizes, so while under optimal / linear circumstances they should behave identically, if you care about inductance, resistance, or you are saturating the transformer, they will not respond in the same way.

I found this thread because I was looking for info on using these transformers as inductors, it's probably the easiest way to get 500mH or more inductors these days.

It seems there is a lot less info on the 42TM range. I would guess because being larger they tend to present larger inductances than might be useful in EQ circuits.