I have been working on this circuit as a project for school for a few months.
Here is the schematic
It is a pulse generator that produces 100ns pulses at 220VDC. These are used to drive an ultrasonic transducer that is represented by the 50 ohm resistor between the differential probes. Cadence simulates the circuit exactly as I predict, so I am not worried about finding any surprises other than shock hazards.
Here is my circuit
I have a few questions that I am too paranoid to trust google with.
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I am going to buy wood from Lowe's to make a case for this circuit. Since there is no metal chassis, do I need to solder the green earth-ground wire anywhere in my completed device? I know that it cannot be soldered to the ground of my circuit, which is the piece of copper tape on the back side. The Vpulse ground will also be separate, as it will be MCU ground. If it is necessary, I have more copper tape that I could stick somewhere within the case separate from the rest of the circuit.
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The datasheet for my isolation transformer does not specify where the white wire 'shield' should go. Googling shield I found that it is usually connected to ground,but is not necessary. I could not get the Cadence simulation to work with the center-tapped transormer, and instead used two coupled inductors as shown in the schematic. Is leaving the shield floating okay?
Are there any other things I should be worried about before plugging it in?
Datasheet of Isolation Transformer:
https://www.alliedelec.com/m/d/72306b3400a5a118df03c1c122b42c87.pdf
Best Answer
I corrected your schematic here: