Circuit Project Electronic

This design was generated as part of a remote weather station project. One of the requirements of the design is that it have a solar-powered supply with rechargeable batteries. This design is based on a photovoltaic array available from Radio Shack called a BatterySAVER (part number 980-1045). It was designed to charge your car battery [...]

The reading lamp consists of a small solar panel, a standard UPS style lead acid battery, and an LED circuit board. The circuit board contains a low power solar charge controller (regulator), a set of 8 white LEDs, a switch, an LED current regulator, and a low voltage disconnect circuit. The circuitry will insure a [...]

Let’s start analyzing the circuit in idle condition, when the engine is stopped. The battery voltage at B+ cannot pass to D+, because D1 blocks it. D+ is at ground level, because of the low resistance of the dynamo between D+ and D-. Q1 is biased off, which leaves the negative side of the entire [...]