Amazon.com: HiLetgo 2pcs DC 12V 2 Channel Relay Module with Isolated Optocoupler High and Low Level H/L Level Trigger Module Triggered by DC 12V : Industrial & Scientific
Amazon.com: Donner DP-1 Guitar Power Supply 10 Isolated DC Output for 9V/12V/18V Effect Pedal : Musical Instruments
Flash an LED from ac-mains power - EDN
ALL B5] UN 09 Flash Control - co to za wynalazek (zdjęcia) ? - Audi A4 B5 - Forum Audi A4 Klub Polska
Amazon.com: DSD TECH 12V Bluetooth Relay Module for Remote Control Switch Compatible with iPhone and Android 4.3 : Electronics
I was wondering if there is any way to upgrade this zx spectrum EPROM programmer so it can also write on 27256 (32kb) and 27512 (64kb) EPROMs. : r/AskElectronics