/diy/ - Do It Yourself

>>2499562
>Are the diodes just there to provide some sort of snubbering with the two capacitors?
Yes, that's what seems to be the case. Circuit works just fine without diodes and capacitors. But when you start increasing L big spikes start to appear on collectors. Now let's say there was +15 on inductor and we switch to negative -15. Problems happen during the switch if there is a time when both are off. This means that inductor is basically floating and because there is magnetic energy stored in it voltage must change. If you remove positive voltage, you'll get negative spikes until bottom transistor turns on. Before it turns on its collector base junction acts as a diode and happily conducts negative voltage to base. If you leave that shit there it will destroy transistors. Now when negative spike happens it will go through CB junction of bottom transistor and through diodes to ground. Now capacitors are there to speed up transition so that they help pull input pins into same direction. At least that works if you swap direction of diodes and put capacitors to bases of input transistors. Then ringing basically disappears.