A simple charge controller suitable for wind or solar applications. Uses a TL-084 Op Amp, automotive spotlight relay and a handful of other components. The same circuit could also be used as a low voltage cut off to disconnect your battery before its fully discharged. Suitable for 12 and 24v operation.
The controller uses two trimpots to set a low and high switching voltage. When the applied voltage ( battery ) exceeds the high voltage setting, a relay is turned on. The relay will remain on until the applied voltage drops below the low voltage setting.
Wind or Solar Charge Controller – [Link]
This is a project for viewing the frequency spectrum of input signal using dsPIC. The hardware uses the following:
2. Opamp (any one, like LM358, TL084).
3. Power supply.
dsPIC based Spectrum Analyzer – [Link]
This project (posted on hobbydebraj) describes a simple spectrum analyzer based on a dsPIC30F4011 microcontroller. It uses Microchip’s FFT library codes to calculate the frequency spectrum of an input signal. The signal conditioning is achieved by a TL084 Op-amp IC. The peaks of spectrum are displayed on a graphics LCD. [via]
A simple spectrum analyzer using dsPIC30F4011 – [Link]