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Is there some way of doing this without a micro-controler?
Look at the **broken link removed**. There are two pots, one for the high range and one for the low range. The 4066s are digitally controlled switches. U2a and U2c switch in one or the other of the two pots. U2b along with R1 act as an inverter, so that when U2a is on, U2c is off, and vice-versa.Is the circuit adjustable without a potentiometer. how is It adjustable? I assume the 4066 is a series of values........? I kind of understand , but a explanation would help me greatly...?
Hmmmm......... interesting.........I have yet not looked at the IC, but how is the duration controled? ....thanks much for everyones help, I have looked through past posts. and to simplify, Only low speed needs to be varariable then switch to a preset frequency for high.....