Simple Guitar Practice Amplifier

Designer

Simple Guitar Practice Amplifier

Group: Robherc's Workspace

A simple battery-powered (single 18650) practice amplifier that allows you to practice on an electric guitar & hear on headphones, rather than rattling the floorboards with your wall-powered AMP. -- An excellent circuit to build for "aspiring guitarists" who are causing cacophony in your home!

Simple DC LED Lamp

Designer

Simple DC LED Lamp

Group: Drasknes's Workspace

My first project. A battery powered Light Emitting Diode lamp, aimed to become a reader's lamp with a low opperationg cost.

Demonstration circuit

Designer

Demonstration circuit

Group: Darrell's Workspace

Demonstrate a wide array of model features.

Battery charging circuit part 1

Designer

Battery charging circuit part 1

Group: TanelAinla's Workspace

Battery charging circuit for lithium ion battery. This is derived from a www.Silego.com GreenPak 2 application note.

test Li battery

Designer

test Li battery

Group: TomCarroll's Workspace

This is a simple test circuit for a lithium battery. The current sources first discharge and then recharge the battery.

The battery models the anode as a porous substrate that is plated with a metal and then filled with lithium. The resistance of the metal is calculated from the resistivity of the metal (an input parameter). The battery capacity is calculated assuming that the lithium is the limiting reactant.

The open circuit voltage is modeled as a function of state-of-charge (Nerst equation).

Three loss mechanisms are included:

(1) Activation voltage drop (Tafel equation)

(2) Ohmic losses (resistivity of substrate and plating)

(3) Transport losses (empirical)

surface charge storage is modeled as a time delay between the instantaneous activation voltage and the effective activation voltage.