| Fitting a bike with a rear light that stays on even when stationary is both useful and interesting — especially when it uses a circuit as si...
Jürgen Stannieder (7)
| For load currents up to 4 A the author has used a bistable relay to disconnect the load on a 12 V battery to avoid deep-discharge. How can w...
| The electronic game Simon comes in the form of a large, round console with four red, green, blue, and yellow illuminated buttons. These butt...
| This design came about when the author wanted better control of his 12 V solar-charged garden lighting installation. It is however a versati...
| The circuit described here can be used to ensure that a 12 V sealed lead acid (SLA) gel battery isn't discharged too deeply. The principal p...
| This timer circuit is designed to switch on a 12 V load in a solar-powered installation for a preset period at the press of a button. When t...
| A traditional hand-held torch could hardly be described as a cutting-edge piece of technology; in fact it's probably the exact opposite,...