A few month ago, I replaced the decoder of my Märklin 120 003-9 (3653) with the 60760 decoder and 5-pole HLA motor.

The simple 60760 decoder officially supports only the standard light ports (LV / LR) but no additional free AUX ports. But there are two undocumented AUX ports available. F3 is an amplified AUX port that can be connected directly, F1 is a non-amplified logic level port, that must be amplified before using.

For the beginning, I connected a control cab light to F3. On the right side, You can see the buffer capacitor:



To enable the non-amplified F1, You can take a lokk to this document:
http://www.web-hgh.de/pp...l/Decoder-Tuning_pic.pdf

or to my circuit plan, including the buffer capacitor with resistor and Schottky Diode:



Here the motor shield equipped with ball bearing:



And here the control cab with interior light (much to bright):

Edited by user 09 October 2014 08:51:29(UTC)  | Reason: Not specified

A simple circuit board for amplifying two logic level outputs. Less than $5 US.

http://store.sbs4dcc.com...ctionAmplifierBoard.aspx

Enable F1 AUX port on 60760 fx decoder

These are the needed parts to enable the un-amplified F1 AUX port:



The transistor and capacitor are soldered with the cables and put into the shrink hose:



The white cable is the decoder GND (in the circuit plan it is purple) and the brown-green one is connected to the low-level F1 AUX port:



The orange one is ready to be connected to an electrical load (light bulb, LED, ...):



There is no function mapping needed, the AUX port is already mapped to F1. On the MS2 You only have to activate the F1 button!

Great article, how effective are you finding the capacitor?

Also this image seems to be missing...
”circuit plan, including the buffer capacitor with resistor and Schottky Diode:”

I wouldn't bin the 60760, in fact I'm happy to use more of them.

126 speed steps are way over rated - that's umpteen turns on your controller knob to get the decoder up to max speed and an umpteen more to slow it down! I honestly don't understand this 'wow wee' nonsense over 126 speed steps!

28 is the max you (I) need.

+1 on the 126 speed steps..

It reminds me of a Prime Minister that said people will never need an Internet speed of 100mps at home..

That was my experience as well. I recently removed that decoder from my Class 103 which I upgrade a couple of years ago. This time I used an mSD/3 and the difference in performance from the same motor is amazing. It now runs very smoothly and at an amazingly small number of speed steps without a stumble or a jerk (operator excepted).