This little circuit is invaluable for quick go/no-go testing of just about any remote control transmitting infra-red (IR) light. The tester is battery-powered, built from just a handful of commonly ...

Sam – an ex-science teacher – uses his physics degree and five years of experience at Which? to test everything from beard trimmers to electric bikes and trampolines. The best remote-control (RC) car ...

Farm machinery boffs are adamant that tractors are going to change, but exactly what they might morph into is still a bit of a mystery. Several manufacturers have already had a stab at building ...

This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET opamp, CA3140 is used in the differential mode to amplify the pulses of current from the ...