Thursday, September 15, 2011

Portable Guitar Amplifier

Component Part

R1_____________22K 1/4W Resistor
C1_____________10µF 25V Electrolytic Capacitor
C2_____________100nF 63V Polyester or Ceramic Capacitor
C3_____________220µF 25V Electrolytic Capacitor
J1,J2___________6.3mm Stereo Jack sockets (switched)
SPKR__________8 Ohm Loudspeaker (See Notes)
B1_____________9V PP3 Battery or 3V Battery (2 x 1.5V AA, AAA Cells in series etc.)


For reasons of simplicity and robustness, the unit features a double bridge amplifier IC and a few others. For the same reason you can not control the volume or tone are provided as it is assumed that the existing controls on the electric guitar used successfully with the target.

No switch is used: the battery voltage is applied to the circuit when the jack is inserted into the input jack J1. To do this, make sure the input jack is a standard 1 / 4 inch mono guitar jack and J1 is a 1 / 4 inch stereo jack.

J2 output connector plug must be turned on the stereo type. The switch is arranged so that when a single stereo headphone jack is plugged in, the speaker will be disabled and the output disc at a time mono headsets in the series, giving full reproduction of the helmet. When used as an output Fuzz-box, a mono jack is connected to J2.

If the amplifier is to be enclosed in a pack of cigarettes, the speakers of standard diameter must be 57 or 50 mm.

Technical Data:

Max power: 1.5 W @ 9V - 8 ohms, 60mW @ 3V supply - 8 ohms

Flat frequency response from 20 Hz to 20 kHz

THD @ 100 mW: 0.2%

Max input voltage of 3V @: 8mV RMS

Minimum input voltage for the operation Fuzz-box: 18mV RMS @ 3V supply

Current consumption @ 9V 400 mW and power: 200mA

Current consumption @ 9V 250 mW and power: 150mA

Consumption 60mW @ 3V supply: 80mA

Standby current: 6mA @ 9V, 4mA @ 3V supply

Fuzz Box consumption: 3 mA @ 3V supply

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