[LectronFanModerator]

Hi all,
After some searching, I found a way to replace the high Ohmic (250Ω and 500Ω) Lectron earphones.
The modern stereo in-ear earphones have about 32Ω DC resistance.
When we connect the left and right channel in stereo, we obtain about 64Ω.

So, I went looking for a very small transformer that would fit in a normal sized small Lectron module (as used for resistors or capacitors).
I found one that has a primary winding of 210Ω DC resistance (which is about the same value as the Lectron earphones used in the school systems).
Some older Lectron earphones have a larger value, namely 500Ω DC resistance.
By adding a 270Ω carbon resistor in series with the primary, we’ll obtain this value.

The secondary of this transformer has a DC resistance of about 80Ω and is thus perfect for the new stereo in-ear earphones.

This transformer, in combination with the new stereo earphones work perfectly well for all Lectron experriments.
I succesfully tried many experiments of the Mini-system, school system and Braun Buchlabor.

The transformer is very small as you can see in the picture below and it will fit easily in a normal sized small Lectron module, together with a stereo earphone socket.

 

Many greetings

[MichaelKeymaster]

You continue to amaze me with your excellent Lectron System improvements!  Amazing!  The legacy earphones were always a bit anemic in terms both volume and fidelity.  Your new improvement sounds (ha ha) like a great fit for the FM Radio Stereo blocks!  Thank you always for your continued innovations with the Lectron System, you are a true Lectroneer!

[Author]

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