I just finished making the MK133 quiz tabel, unfortuntaly it doesn’t work.
If I press any of the 4 switches or the reset switch, only led number 5 (the reset led) lightens up?
What can I have done wrong??
suggestions are welcome…
Most likely an assembly error, but hard to troubleshoot without actually being able to examine your kit.
If you can link to HI_RES and SHARP pictures of both component and solderside, we can take a look at your assembly.
picasaweb.google.com/11277228075 … 8172776786
picasaweb.google.com/11277228075 … 4189636130
picasaweb.google.com/11277228075 … 9638830114
maybe this works better?
Component placement looks OK. Make sure BC547 and 557 transistors are not mixed.
Couple of bad solderings need attention.
Make sure to use a fresh battery.