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Post by sacramento on Aug 17, 2014 20:11:14 GMT
I decided to make a smd pcb for the function decoder and I will post it as soon as I have it working.
I had to make some changes in soma components in order to get them as smd and I would like to know if the changes I made are correct.
So I changed D4- D7 for UF4001 to ES2D, BC182L for BC846D and used a zener diode ISKB593BT3G. Can you tell me if this is ok?
Also I have another doubt. On the application examples using a 3 output decoder you show the A connected to common, B to white night, D to white day and 5V or C to red tail. Since 3 output decoder has only A, B and D, where do you get the C?
Thanks and regards Sacramento
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Post by Paul Harman on Aug 23, 2014 0:13:11 GMT
Hi Sacramento
The ES2D should be OK but I cannot find data for the Zener or transistor so I cannot comment on those. If the Zener is 27V it should be OK and if the transistor is a general purpose NPN that will be OK too.
The 3-output decoder does not have output C hence the tail light being connected to +5V instead such that it is on all the time according to direction of travel. Note that this application requires the low power version of the decoder, without the output transistors and that if you are making a surface mount decoder there is little advantage in building a 3-output version since the 8-output version that includes output C will be the same size. 1N4148 diodes can be used for D4-D7 on a low power decoder but not on the high power version.
Rgds Paul
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Post by sswcharlie on Dec 26, 2020 0:46:56 GMT
Hi Sacramento
Did you get to finish project and can you post the details and pcb etc Thanks
Charles
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Post by rayray on Jan 27, 2021 4:33:29 GMT
Hi Sacramento Did you get to finish project and can you post the details and pcb etc Thanks Charles I am working on a SMT version for my cab car coaches (HO, by Fleischmann) and might be able to help you with SMT PCB also. Do you have a size constraint/limit of the decoder? If you also want to put into OO/HO train cars, e.g. tape to the roof/ceiling, it should be no problem. You may contact me further at chenhongmai2020@gmail.com.
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