![]() My Action Potential Generator Circuit and Microcontroller Action Potential Generator articles describe method to produce a similar waveform (designed to look more like what firing neurons produce) using transistors to charge/discharge a capacitor rather than op-amps. You will need the LM741 model found on the Using MOD Files in LTSpice page ![]() Unity gain op-amps should have some feedback resistance to improve small-signal stability in production applications, but for messing around here I felt fine omitting them. ![]() The second op-amp serves as a voltage buffer to stabilize the output, and the final series capacitor shifts the voltage so it's centered around zero. The signal is a square wave at about 1Hz, but it is mostly high with brief low pulses. The main purpose of the first op-amp is to invert polarity of the signal emitted by the 555. The duty of the pulses is controlled by the resistance in series with the diode (R3), with higher resistances resulting in larger duty. The diode (D1) causes the 555 to produce very short pulses. The 555 timer generates pulses about once per second.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |