Testing for failure with a multimeter is only partially effective, whereas a dedicated optocoupler testing circuit provides ...

This circuit can be used to test up to three LEDs at once, connected in series. You can easily increase that number by using a higher supply voltage. If you do so, you should allow 2.7 V for each ...

If you fondly remember drawing circuit diagrams at school, this lamp will make you smile: Its designers created it to mimic the line-drawn circuit plans that make it work. The lamp—called Node—was ...