Murata 10uf 0603 LOW ESR SMD Capacitor 0.25W 4.8mm Clear StrawHat Cool White LED It's not too costly

It's not too costly

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one of which is connected to an IR LED and the other to a phototransistor

DIY and Prototyping Projects – Ideal for custom power circuit designs

Rather than that heat shrink sheet provides electrical insulation

Murata 10uf 0603 LOW ESR SMD Capacitor 0.25W 4.8mm Clear StrawHat Cool White LED It's not too costlyThe GRM188R1E106MA73D is a high quality multilayer ceramic capacitor (MLCC) from Murata, designed for reliable decoupling, filtering, and noise suppression in modern electronic circuits. Featuring a stable dielectric and compact SMD package, this capacitor is ideal for space constrained applications requiring dependable electrical performance. Features High capacitance in compact SMD package Stable dielectric suitable for general purpose applications