How about a high quality switching ‘wall wart’
The Version II head is more compact and lightweight
Contact Material Silver Tin Oxide Relay Mounting Through Hole Coil Type Non Latching Coil Resistance 63ohm Product Range G5LE Series Relay Terminals Solder Contact Current 10A Approvals & Standards CSA
Emitter Distance: up to 10' (3m)
KEMET FCS0V224ZFTBR24 Supercapacitor, EDLC, 0.22 F, 3.5 V, FC Series, +80%, -20% Tiffen 6666PEARL2 How about a high qualityThis is a Supercapacitor, EDLC, 0. 22 F, 3. 5 V, FC Series, +80%, 20% product from KEMET with the model number FCS0V224ZFTBR24Product details Capacitance 0. 22F Voltage Rating 3. 5V Capacitor Terminals Product Range FC Series Capacitance Tolerance +80%, 20% Packaging Each Lead Spacing Lifetime @ Temperature 1000 hours @ 70C Operating Temperature Min 25C Operating Temperature Max 70C ESR 50ohm Capacitor Case Style Radial Can SMD Other details Brand