26-08-2012, 07:23 PM
i want full documentation on dual supply from single battery source and its applications
26-08-2012, 07:23 PM
i want full documentation on dual supply from single battery source and its applications
06-09-2012, 03:37 PM
Dual Supply From Single Battery Source
1Dual Supply.pdf (Size: 993.66 KB / Downloads: 215) Dual-voltage power supply is required especially for powering the op-amps and some of the instrumentation amplifiers. A few low-power audio pre-amplifiers also use dual-voltage supply. This circuit provides both +9V as well as -9V supply from a single 9V battery. It consists of timer IC NE555 (IC1), negative-voltage regulator IC 7909 (IC2) and a few discrete components. Timer IC NE555 is configured as a free-running oscillator. It produces around 100kHz frequency. An audio system would not pick up this frequency as it is above the audible range. Therefore a Villard cascade voltage multiplier is used as the volt voltage booster. The boosted voltage is made ripple-free and regulated to -9V by negative-voltage regulator LM7909. The frequency of the squarewave generator depends on the values of C1, R1 and R2. The frequency of the signal may slightly change with the temperature variation but the change in frequency does not affect the output voltage of the circuit. |
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