- #1
mishobg12
- 25
- 0
Hi all,
I have almost completed a project that I power on the breadboard from USB and it works with TTL levels.
But the situation is that I must make it powered by 12V and working with CMOS logical levels (because of the external input to the device).
All my chips are CMOS already (HC to be more exact), but at the moment working with TTL logical levels. So, I guess, there will be no problem with them, and for powering the PIC probably I could use a stabilizer. But I don't know what to do about making compatible the CMOS logical levels that are going to be sent by the ICs with the PIC.
And another question, can you give me some good advices about putting protection on the device input from high voltages and big currents so that the chips won't burn out.
Thank you
I have almost completed a project that I power on the breadboard from USB and it works with TTL levels.
But the situation is that I must make it powered by 12V and working with CMOS logical levels (because of the external input to the device).
All my chips are CMOS already (HC to be more exact), but at the moment working with TTL logical levels. So, I guess, there will be no problem with them, and for powering the PIC probably I could use a stabilizer. But I don't know what to do about making compatible the CMOS logical levels that are going to be sent by the ICs with the PIC.
And another question, can you give me some good advices about putting protection on the device input from high voltages and big currents so that the chips won't burn out.
Thank you