for the op amp to work correctly the -V supply on the op amp should be -9.0V right? since the +V is equal to +9V
I'm switching between a datasheet and the circuit on this page now and looking at the capacitor connected to pins 3 and 5 of the chip I believe there is a misdrawn component on this circuit. Specifically the cap is backwards.Hello,
Look at the two positions of the 7660, to see how the capacitors are switched.
Bertus
The signal/AC Source is not connected to the charge pump, the lines simply cross. There isn't a "\(\bullet\)" (standard) or "\(\circ\)" (in this schematic) to indicate a connection. The signal only goes to the non-inverting input of the amp.so when the switches are in the other position, the capacitors will be in series. i see that, but i am getting lost trying to follow that out...
the power comes in the AC source, then flows through the 150k resistor, then down to terminal 3 or 5. im confused
Don't look at the datasheet labels for the IC pins. Look at the "internal picture" in your schematic above.9V goes to the V+ of the op amp and terminal #8 of the IC. terminal #8 on the IC is the Vin for the IC. that is going to be there no matter which way the switch is flipped.
Ground goes to terminal #5 on the IC which is also the Vout
the -V input goes to terminal #3 on the IC, which based on the IC datasheet should be a Ground.
so when the switches are in the other position, would power be flowing into terminal #5?
yes i can follow that one. +9V comes in #8, then to #2, through a cap, back in #1, up to #3, then up to V- on the op ampDon't look at the datasheet labels for the IC pins. Look at the "internal picture" in your schematic above.
+9V goes to one side of a switch, then back out to a capacitor, and continues.
im sorry i meant to say "the two capacitors in parallel". but still the C total would be equal to 4.4uF.Hello,
Your calculation of the total capacitance for the series of the capacitors is wrong.
Take a look here how to calculate it:
http://www.allaboutcircuits.com/vol_1/chpt_13/4.html
Bertus
by Jake Hertz
by Jake Hertz
by Jake Hertz
by Jeff Child