Ron H said:
4040 outputs don't switch between open circuit and GND. They switch between open circuit and VCC.
Actually you are both incorrect. The outputs of a 4040 counter switch between VCC and ground. They are never open circuit. :lol:
MStechca's hair-brained idea wouldn't work even if the counter provided switched resistors:
1) The output resistance of the counter is about 200 ohms.
2) Seven 10k resistors in series with the outputs and all in parallel produce 1.5k.
3) Since when is a speaker signal reduced if 1.5k or more is added in parallel with the speaker? :?: :?: :?: