How to activate a solenoid using TSOP4838 IR receiver
Something like this.







simulate this circuit &ndash; Schematic created using CircuitLab

the TSOP4848 pudt out pulsing singal when it seed infrared remote signals, when it goes low it discharges C1, when it goes high or when there is no infrared C1 slowly charges.

when the capacitor is below about 1V Q2 turns off allowing the current through R3  flow into Q1 turing it on. this energises the solenoid and stops the current through R1 this turns Q1 off even harder making sure that the solenoid does not chatter.

Edit:   added D2,C2,R7 to provide a 5v supply to run the TSOP4838 IR receiver
or you can omit those parts and supply 5V to pin 3 by some other means.