![]() The transistor output can swing almost 8.5 volts peak-to-peak before running into the limits of the power supply. The current requirements for the bipolar booster are quite low and a 9v battery will last many months when powering this circuit. The single transistor can provide over 25db of gain it is quiet, inexpensive and performs well to increase signal strength. This is a basic bipolar booster circuit similar to that used in the old Electro-Harmonix LPB-1, and currently the featured design of numerous boutique booster pedals - I have seen this exact circuit in several custom-made pedals. None of these items are important in stompboxes but reducing the power supply can be interesting nonetheless. Lower voltages will mean less heat generated, faster speeds and more energy conservative computers. The trend in computer chips has been to lower supply voltages, at first from 5v down to 3.3v, but now even lower! A lower supply voltage can be important in large-scale-integrated-circuit chips where there are many thousands of transistors packed into a very tiny amount of silicon. However, there is an option that is often overlooked in pedal circuits, and that is using a lower supply voltage to power a pedal. It is convenient, inexpensive and provides enough voltage for most circuits to operate comfortably. ![]() This little package of power is the source of energy to drive 99%+ of the stompbox pedals on the market today. Low Voltage Boosters Alternatives to the 9v Battery
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