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yes my application work with 100k in simulation and with analysis 100 ohm is very small coz it will get high on base every time so not can sense with input zero
therefor i put 100k to make base pull up and can sense with zero voltage >>>>>>>
Thank you for ur help >best wishes for you
i do it in proteus >>>>>>>> when input 5 v get me 1.8 in rx
but when input zero get me 1.8 in rx too
there no change
please check resistor 100
maybe you mean 100k
because i change it to 100k and get me low voltage at rx
thank you karthikkrv85
i will test it and reply on you soon
---------- Post added at 11:46 ---------- Previous post was at 11:34 ----------
please >>>>>>>>> what the model number for this transistor or general pnp and npn
hi
i need to communicate between pic micro-controller that run on vcc 5v ,, gps module sim18 that work on 1.8v
how i can get two to work together TX/RX ??????
there any circuit for voltage shift level ??
or any ic can do this work ?
sim900 don't accept a calls after send sms and that need from me to restart the module by at command after sms sending
i need to solve this problem without restarting
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