This schematic is only for testing freebus (eib) devices in home use. Not recommend for your working installation.





Values for this circuit:

R1 = 10K
R2 = 10R
R3 = 10K
C1 = 100µF
T1 = BC 337
T2 = BDW93A ( may other npn will work also)

The first layout:

I have test this circuit with a few devices, works for me fine but there will be a few problems if you have a larger installation. So the impuls length is the long, the condensator should be have higher voltage tolerance. 

TODO:
Built a new version of it with coils.

Design a circuit for DIN Rail Case.

This is a schematic of an orginal device:




-- David --