schematicwiring.com

The following schematic is an audio-controlled incandescent lamp light controller. It requires low voltage input such as pre-amplifiers, tone control, or general audio line level output. It’s also conceivable to feed the input with signal from small power amplifier output, or high power amplifier witk low volume level. The feature of lamp dimming (incandescent lamp) [...]

The following circuit shows the signal conditioning circuit for remote current loop temperature transmitter. It is a loop powered, means it doesn’t need its own power supply since provided by the current loop receiver. Here is the schematic : 

The following schematic is a simple solar panel circuit using TLC271 integrated circuit from the Texas Instruments. Here is the parts and components :