Vážení, nevíte k čemu jsou tyhle pady na plošňáku? Potřebuji vytáhnout ven napájení pro digitální spřáhlo, bylo by fajn, kdyby tam bylo + a -
V manuálu ZIMO to nějak nemůžu dohledat.
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Fox píše:Vážení, nevíte k čemu jsou tyhle pady na plošňáku? Potřebuji vytáhnout ven napájení pro digitální spřáhlo, bylo by fajn, kdyby tam bylo + a -
V manuálu ZIMO to nějak nemůžu dohledat.
Yes, I know there is no bottom view of the MX658N18 in our MX-decoder manual, describing these two solder pads, which only MX658N18 revision B have (so the first hardware revision A of the MX658N18 don´t had these two additional solder pads). These two solder pads can be used to connect addition capacity directly, so for example two more 47µF/20V tantals (see picture attached) are fine - if there is not much free space left is in the model. One of these solder pad is simple ground, the other solder pad is a kind "elco plus" solder pad … you just a voltage limitation there of about 16V … so even if your track voltage is higher than 16V (unlikely in case a typical gauge N or TT layout, but possible) only up to 16V are put there.
I assume you use the MX658N18 in a model with enough free space inside … as you bought an STACO module additionally (so enough free space in the model to fit in the STACO-PCB and the included GoldCaps). You may connect the STACO there alternatively via these two solder pads … only polarity must be taken in mind for the connection of the two cables of the STACO-PCB with are for the connection to the decoder.
Alternatively if you have the "common positive" and "ground" (Both are pins/contact of the normed Next18-interface, so the plugged in Next18-decoder contacts it through the interface to the loco board) also as big (more easy accessible) solder pad also available on the Next18-loco board, you can connect the STACO also there (always better to connect consumer and energy storage solution via the loco board in case of decoder which is designed for "plug and play" (so every decoder with a Next18, PluX, 21MTC or E24-interface are counted as "plug and play"). Even though the common positive is always the rectified track voltage of your command station - so it is not the same as an "elco plus" (where you usually have at least a voltage limitation) in this particular case it doesn´t matter.
Keep in mind a coupler is only allowed to be connected to amplified decoder function output (=FO, =AUX). The Next18-norm defines that only the four lower outputs (FO0f=front light, FO0r=rear light, FO1 (=AUX1) and FO2 (=AUX2)) are amplified ones, any higher FO (f.e. FO3) must be logic level FO on a Next18 decoder. So I assume you "convert" externally the logic-level-FO3 in an amplified output via the MosFet to get an amplified FO3 for connecting the minus line of the SD coupler.
The question is: are these pads positive+ and ground and can they be used for the supply connection as stated above?
No, one pad is "elco plus" (so max. voltage there limited to a certain voltage, while the "common positive" has no voltage limitation - it has always the track voltage of used command station) the other one is "ground".
If I understand correctly, these capacitors do not back up the motor drive circuits? This is important information for me, the main reason why I was considering the maximum capacity. To summarize, if I want to back up the motor as well, do I have to connect the STACO module to the plus power supply available on the NEXT18 connector and the minus to (ground) on the capacitor pad?
For a separate ELCO (470 uF), is it necessary to add a diode, resistor and coil, as stated in the manual?
Sorry, I should written it more clearly, in case of MX658N18 Revision B (so particular for this decoder!) you have the following possibilities (for free choice):
- You can connect directly a capacitor (without any additional parts (diode,…) needed) to two solder pads ("elco plus" and "ground") on the bottom side. You are in this case limited to 1000µF max capacity AND motor drive is not "buffered"(=backed up). And the voltage strength of the capacitor (f.e. tantal) should 20V voltage strength.
Advantage: not much free space needed in the loco; very cheap solution (capacitors/tantals are cheap)
Disadvantage: no motor buffering, and 1000µF are not much capacity but surely enough to buffer processor and sound.
OR (!)
- You connect a STACO-solution (STACO1, STACO3A, STACO3B or STACO4) via "common positive" and "ground" (preferable via the solder pads on the loco board, as "common positive" and "ground" are also pin of the Next18 interface, so contacted through to the Next18-locoboard). No additional parts (diode,… needed).
Advantages: Big buffering (as very high capacity) effect including also the motor drive buffering.
Disadvantages: You need much free space inside the loco (STACO-PCB + GoldCaps must fit into it); STACO are not so cheap (in comparison to a tantal f.e.) - but that is the most professional solution
OR (!)
- You use the external circuit shown on page 62 in the MX-decodermanual (https://www.zimo.at/web2010/documents/M ... ers_EN.pdf) … not recommended is the very simple version with elco (must have a higher voltage strength) and resistor connected shown on the left half page (so via common positive and ground). So only the right half page is a real possible solution for me … There (so connected via " common positive" you need a diode, 2 resistors and coil/choke (needed, other software update don´t work) and one or more 25V elcos (no max. capacity there defined), it will also buffer the motor in this case. These parts are standardized parts, so you can buy them from any electronic part distributor and the parts are also available as do-it-self-kit under the ZIMO article code "SPEIKOMP" from every ZIMO retailer.
This is for the "middle" solution of all three … needs a certain free space (less than STACO-solution - but more as just the tantal) … costs are also in the middle … and buffer effect also in the middle (as usually more capacity as just the tantal but less than STACO offers).
I would recommend you to the STACO-solution … it is most professional one giving the best "stay alive effects".
if I want to back up the motor as well, do I have to connect the STACO module to the plus power supply available on the NEXT18 connector and the minus to (ground) on the capacitor pad?
Yes, that is valid possibility. So STACO plus pole is connected with "common positive" (NOT/NEVER "elco plus") and the STACO minus pole is connected with any ground pad … as ALL ground pads are internally connected in a DCC decoder, you can freely choose which one you use. F.e. the one ground pad bottom side (ground=elco minus also) or as the ground is also on two pins of the Next18 connector you can either directly solder it additionally to Next18-plug (but that is very "tricky" to solder - so not really recommend, better is to check if the ground is also available as big (easy accessible) solder pad on the Next18-loco board itself, as it is common to offer all contacts of the Next18-interface also via big solder pads on the Next18-loco board (so you have a small line (printed wire) from one the two ground pins/contacts of the Next18-connector on the loco board to big solder pad … usually labelled with "GND" for ground or the ground symbol).
For a separate ELCO (470 uF), is it necessary to add a diode, resistor and coil, as stated in the manual?
Answer is NO, if you connect the elco plus pole of that elco to "elco plus" (bottom side of the MX658N18 Rev. B).
Answer is YES, if you plan to connect the elco plus pole of that elco via "common positive" (no 1000µF limit there) … so what is shown on page 62.
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