Hi! I should probably start off by saying that I did attempt to search for this, but I wasn't able to find a thread that had a similar question. I'm driving an RLC network (in effect) with a square wave to saturate a ferrite core. The image is pretty close to what I'm trying to achieve. I need the circuit to be in the frequency range of 10-40kHz to resonate the secondary winding with the capacitor, but I also need to be able to output enough current to saturate the core (apprx. 200mA?). Right now I'm using an LM392 opamp as a astable multivibrator to generate a square wave, but I haven't been able to get it to go over 2kHz...and the chip is limited to about 20mA on the output. I looked into 555 H-bridge circuits, but I need the circuit to produce a ±V square wave to saturate the core in both directions, and it didn't seem like the 555's would handle negative voltage. I looked at using a mixer and crystal oscillator to boost the frequency, but that still doesn't solve my current issue. Does anyone know of a good way to achieve this? I just didn't know the words to search for in looking for other options, so I thought this would be a good place to ask for help. Thanks for your time!