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how to measure crystals
The CPU oscillation may be corrupted by the input capacitance and resistance of your oscilloscope.
You can measure frequency of pulse at any output pin that relates firmly with CPU clock, it must be very convenient to do this in case your CPU is flash then you can write...
AVR-clone???
I have heard many times about "PIC-clone" microcontrollers, but never "AVR-clone".
Do you know if "AVR-clone" is possible, and why/why not?
Audioguru is right, you need to use a potentiometer to adjust the "null offset", connecting both inputs to the ground is not enough to get the 0V output. Plus, you must use a close feedback loop, do not left it open.
Re: Russian RTL IC pin out is needed
Attached is what you need (1.gif = your 1st IC, 2.gif = 2nd IC, 3.gif = package). Please note that:
- pin 2 = GND, pin 9 = +Vcc.
- Vcc = 4V +/-10%.
- replacement is based on your particular application. These ICs are very obsolete and I do not see any RTL...
People are talking about these 2 books:
1. Programing and customizing the PIC microcontroller, 3rd edition, by Myke Predko.
2. PIC microcontroller- your introductory course, by John Morton.
I do not think that you need more books.
ac prefered over dc reasons
At the beginning of the electric power use in the world, DC was used, not AC.
But then, the engineers found out that, AC is much easier to be generated than DC, and much easier either to convert to different voltages for different applications as well as for long...
No website can give you all you need, but Google is your best assistant, everyone knows that.
So simply type the IC type in Google webpage and enter, you will find out what you need. Once Google turns back no results, either you did not type in the right keyword or there is no info on any...
quiescent current 7805
IanP gives you the good solution for your idea of sourcing the load of 3.6ohm with currents from xxx to xxxA.
It is funny that you want to adjust different current through a fixed load resistance but want to get load drop voltage constant at 5V??? Do you know the Ohm law?
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