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 ...

Lamp dimmers and their circuits must be compact, energy efficient and able to operate reliably in confined spaces. Lamp brightness is varied by controlling the conduction time of each half-cycle of ...

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 ...