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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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LED lightcurtain / christmas tree lights
KAM LED lightcurtain control box dropped and now no function.
DC rails are right , not yet checked crystal and 555 sub cct function This has 4 channel output , 20V drive to an array of coloured LEDs. Assuming the NXP micro is defunct, and the owner does not use the DMX or mic input or even speed variation , just simple unvarying sequence, would it be possible to salvage the curtain and use a christmass tree LED lightstring controller ? |
#2
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LED lightcurtain / christmas tree lights
555 working. 16M Crystal osc working, but the only other pin with any
activity is an unused external timing pin of divided clock f. Caps check ok, forcing a reset no change, as sprung pin socket for the NXP P89V51 micro added an intermediary 40pin turned pin socket. Any more last rites before consigning to the big dumpster? I've not checked the SN75176 DMX serial chip yet for perhaps latched o/p condition. I suppose using the variable 555 output to clock a 4 stage shift register and couple to the existing 4x TIP122 buffers would be sufficient for the owner's purposes rather than trying to find a suitable chrismass tree set |
#3
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LED lightcurtain / christmas tree lights
Pulling the micro and trying a 4013 clocked by the 555 and feedback between
the 2 flip-flops gives quite a pleasant pseudo-random sequencing to the 4 strings. Just have to hope it does not have a latch up state - I've forgotten how to determine that, clocked through a few hundred cycles without hickup. For anyone else , in the future, where to put the ouput of the mic amp to give a beat sync to the lights? |
#4
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LED lightcurtain / christmas tree lights
I suppose for sound syncing, or'd with the 555 clock would be ok if the mic
amp gives L to H transistion on the beat |
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