Here is an alternate version of your circuit, based on two CMOS 555's. These will turn on the FETs more crisply than a 2 K pull up resistor. U1 is a symmetrical squarewave oscillator, and U2 is acting as an inverting power driver. C2 and C3 are the 555 decoupling caps; they are shown attached to the Reset input for drawing convenience. NF should be nF, but my software does only uppercase component values. The FETs do not have to be the part number on the drawing; they can be just about anything appropriate for the load.
Of course, U2 / Q2 / C3 are not needed if you are driving only one cell.
Because this circuit has only one timing resistor and capacitor, it is much easier to calculate and to make adjustable. The timing equation is in the LMC555 datasheet.
ak
Of course, U2 / Q2 / C3 are not needed if you are driving only one cell.
Because this circuit has only one timing resistor and capacitor, it is much easier to calculate and to make adjustable. The timing equation is in the LMC555 datasheet.
ak
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