Why dont you specify what type of capacitors you are using, also their voltage rating, capacitance and the voltage across which they are connected.
Solenoid current ON must be same used by snubber diode in reverse polarity across coil. the diode dumps the solenoid current when switched off.
The ESR of the regulator or unregulated supply must be much lower than the solenoid,Rs.
If using an unregulated bridge & cap to,drive,solenoid, then the secondary winding resistance of the transformer must be much lower than the solenoid coil resistance to avoid large cap,ripple current when turned on.
There is no snubber diode across the coil
There is a series forward diode to the coil , 3 capacitors in parallel are in across the coil
The series forward bias diode to the coil is to charge the capacitors and coil when it's on, but when the input voltage is turned off, the coil discharges to the series diodes cathode to the capacitors that are in parallel to the coil
The 3 parallel capacitors are charged , when the coil is discharging, so the coils discharging an in rush current and voltage spike to 3 parallel caps that are charged
This might be a problem right?
Just drive the solenoid with a switch and use reverse Power Diode on coil and small RFI cap 0.1uF and decouple from other circuits if required.
yes , this is a problem.
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