Smart Battery Charger Using A Single-Transistor Circuit

The following circit is a smart battery charger using a single transistor. Featre : Simple circuitry, 13.3 VDC supply voltage, single transistor. Component : Battery, resistor, C1061 transistor, 1N4001 diode, relay, capacitor, potentiometer. [electronicdesign.com]

Motorcycle Battery Charger

The following schematic diagram is a motorcycle battery charger. Feature : 115 or 220V Ac supply voltage, current of 3A, full indicator, simple circuitry, 14.1 volt output. Component : LM350, Transformer, bridge rectifier, capacitor, resistor, potentiometer, 1N4148 diode, BC558 transistor, 1N4001 diode, LED, LM1458. [sentex.ca]

14 Watts Audio Amplifier

The following circuit is a Audio amplifier which can give 14 watts of power. Feature : provide 14 watts of power, a discrete power op-amp, gain of approximately 150, preamp has voltage gain of 10, has extremely low distortion, relatively insensitive to the choice of components. Component : Capacitor, Resistor, potentiometer, CA3140, LM301, 1N751 Zener diodes, Speaker, 2N3904 transistor, 2N3906 transistor, TIP2955,1N4001 diode, Inductor,TIP3055.[michaelgellis.tripod.com]

100W Guitar Amplifier Using TL072

This is a guitar amplifier using TL072. This amplifier can amplify up to 100W. Feature : 100W amplification, Simple Circutry, Elegant design, provides excellent tonal range, suit any style of playing, provide a huge amount of gain. Component : Resistor, TL072, Capacitor, Potentiometer, BC549 transistor, Switch, Diode, Zener diodes.[sound.westhost.com]

Balanced microphone preamp

The following circuit is a balanced microphone preamp. Feature : Simple circuitry, inexpensive, 60dB amplification, 12V supply voltage. Component : Resistor, transformer, potentiometer, ne5532, rectifier, 7812, 7912, fuse, capacitor, 7805, zener diode. [nomad.ee]

Light Pollution Meter

This is a light pollution meter circuit. Feature : control range of about 2 to 30 microamps, Simple circuitry, easy to build, battery powered, 9V supply voltage. Component : LED, NPN transistor, Digital multimeter, Resistor, potentiometer, toggle switch, battery. [avery.home.mindspring.com]