On 15/01/2020 17:19, Jay Lennox wrote:
Colin
What Ryan has done is create a second circuit in parallel with the DR4088LN detector circuit.? This will cause some of the current flowing from the track block to the DR4088LN to go through the resistor and the rest of it to go through the detector circuit, and hence reduce the current going through the detector to avoid false detections. Hopefully, the DR4088LN will only 'detect' when a loco is in the block and drawing significant current.? If you search with 'current in a parallel circuit' on a web browser, you will find articles explaining how this works.
What isn't shown in Ryan's pictures is that you still connect the track output?from the command station/booster through the DR4088LN as you would have without the resistors being in the picture. With the resistors there will be two connections to each of the connectors on the green strips of the DR4088LN - one for the resistor and one from the track block.? The other wire from the track output connects to the common associated with the green connector for the block you are wiring.? This will create parallel circuit for each detection block. You may need to use resistors of different values than Ryan suggests to make the detection work - experimentation may be required for your situation, but start with Ryan's suggested resistor value.
I find that the slightest electronic component across a track will trigger the detector. These range from train tech signals to even the little led circuit detector (not that you keep this on the rail). But it shows what little current triggers the device.
So I wonder what happens when these resistors are strapped across, since there will be a 1k approx path from each block to the others (470 + 470). Depending on what impedance each of the outputs are, there is a chance that a loco in one block could trigger the sensors in others via this back path. It probably depends on the value of the which, as mentioned, is set empirically.
Time to experiment, me thinks.
Maybe Digikeijs could look into providing trimming on each output?
--
Chris
