ElectroSuite.com - Guitar Phaser Tremolo Effects Box. It’s a low pass filter comprised of a .047 uF tantalum capacitor and a photoresistor also known as a photo cell or a LDR (light dependent resistor). The LDR’s resistance is modulated by light from a flashing LED which is controlled by the output from a 555 timer circuit in astable mode.
ElectroSuite.com – A nice Solar Power Amplifier Speaker by pstretz, this amplifier is meant to be used outdoors in the sun so there was no need for a battery. Also even if it charged a 9VDC battery it would only last about 15-20 minutes inside anyway.
Solar Power Amplifier Speaker by pstretz – instructables.com
ElectroSuite.com – Discrete FET Guitar Preamp by J. Donald Tillman.
ElectroSuite.com – 100W Guitar Amplifier Mk II.