I was looking thru may parts to make a Christmas display with the maximum number of LED's and minimum # of parts. The attached circuit uses three quad 2 input nand schmitt triggers(CD4093) and one 1 of 8 switch (CD4051). The neat part is it only uses one external resistor as current limiting resistor for 8 to 24 LED's. If a 9v battery is used and the Vf of the LED's totals near 8V then no resistor is needed as the internal 100 resistance of the CD4051 does the current limiting.
Caution the maximum LED current should not exceed 25mA.
Ned
Caution the maximum LED current should not exceed 25mA.
Ned
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