The circuit is simple and only produces a small negative voltage. He mentions that into a 910 ohm load, he sees about -0.3V. Not much, but enough to get that op amp down to zero with a reasonable ...

The question is WHY, I can't think of any reason a modern CMOS circuit with no sound (there's no alarm function) would need a negative voltage supply. What is that -1.5V doing, and if it IS doing ...

Figure 1: This one-op-amp circuit derives a regulated plus-and-minus supplies from unregulated plus-and-minus input voltages. (Note: OP1 is a Maxim MAX4495 device.) The op amp then operates from the ...

Discharge the capacitor to an output capacitor while reversing the connection, so the positive terminal is connected to the negative and vice versa. This approach generates a negative voltage equal to ...

This application note shows how to generate +3.3V at 1A from a –5V supply without the need of a transformer. To view the application note, click on the URL below. Circuit selected for www.eepn ...

The IC also needs a 3.3V or 2.5V VIN supply for itself. The division factor is programmed by the voltage on its REFIN pin, ... For the negative rail then TPS7A3001 (0.2A) or TPS7A3301 (1A) can be used ...

The LM7705 has a smaller footprint and incorporates an oscillator and a regulated DC output into a single IC. Figure 2 This simple and inexpensive inverting charge pump provides a regulated -0.23 V ...

The aim: Create a 3.3V source from a –5V supply. You can obtain a precise, positive-output voltage from a negative-voltage supply with a boost converter and a linear regulator. The input and output ...

It seems to me that the -5V and -12V lines are pretty much obsolete and just thrown in for compatibility reasons. As a matter of fact the SFX power supply standard drops the -5V entirely but keeps ...