| Electronics > Projects, Designs, and Technical Stuff |
| Troubleshooting an optical encoder |
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| OM222O:
https://uk.rs-online.com/web/p/bjt-bipolar-transistors/7115146/ These seemed very close to the original ones used. Placed an order for them which should arrive tomorrow. I will post an update, as well as the working project if everything goes smoothly! thanks a lot everyone for your help. |
| StillTrying:
https://uk.rs-online.com/web/p/bjt-bipolar-transistors/7115146/ Those 3 Amp transistors should work, 100mA or 200mA would have been enough! It looks like there's already 4k7 collector pull ups on the PCB. |
| OM222O:
without the external 1k pullups I wouldn't get any signal on either of the phases! again, I got lucky and it worked the second time I was playing around with it (not sure how or what caused them to) but they didn't work 2 out of 3 times :-DD that's a really poor design in my opinion as the extra 1k pullups wouldn't even cost anything. I try to reverse engineer the board if it worked after replacing the transistor, and maybe seeing where I can improve the design. I will do that as soon as the parts arrive tomorrow. thanks a lot! |
| viperidae:
You mention the white and green wires are the phases. Judging by the PCB white and red are the two phases outputs. They're both connected to identically laid out transistors via a resistor. Edit: red and green. |
| StillTrying:
--- Quote from: viperidae on January 30, 2019, 10:19:45 pm ---You mention the white and green wires are the phases. Judging by the PCB white and red are the two phases outputs. They're both connected to identically laid out transistors via a resistor. --- End quote --- Yes but Red and Green. |
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