AT89C2051/4051 Driving Dot LED


Posted on Feb 5, 2014

A basic circuit of the 89C2051 shown here can be made easily using point-to-point soldering with a universal PCB. Use an ordinary 20-pin socket, do not use a circle-pin socket. D1 is a small dot LED. U2 can be either 7805 or 78L05. U3 is optional for correcting any polarity DC adapter. Without the 2051 chip in the socket, checks the connection, th


AT89C2051/4051 Driving Dot LED
Click here to download the full size of the above Circuit.

en measures +5V between pin 20 and pin 10. Test the LED by shorting P1. 7 pin to GND.




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