If you use 2 battery packs it isn't virtual anymore, it is a dual power supply, which is what op amps like best. It's all in what you call ground.The easiest solution would be to use two 7.2v battery packs; one pack's + terminal connected to the other's - terminal to create a virtual ground.
Pin 5 on a 555 cannot handle a negative voltage.its a tl071 op amp and i need it to send a signal to a 555 for a gas engine sound project i am working on. i need the signal to be negative going into pin 5 of a 555 ic. but i think the split voltage trick with the 2 resistors is going to do the trick.
See the red ellipses for the obvious omissions. There may be other errors.sorry bout that. it lists it in the pcb but not in the schematic. included the jumper for 2 and 6 on the 555, still didnt work. do you think its the ground for pin 4 of the tl071?
Normally, what you say is true. Unfortunately, in this circuit that is not the case. Look at pin 7 on the 555 timer; it's connected to the junction of R6 and R7, but there is no dot; there should be one. The circuit won't function without a connection there.its a game of "connect the dots" if there isnt a dot ... dont connect it, its an overlap.
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by Jake Hertz
by Jake Hertz