How to make Positive and Negative voltage

One of the most common question when it's about amplifiers is how to make +/- voltage needed for IC-s  for instance (TDA7294 or even amplifiers with complementary transistor). btw it's not like when you connect battery in opposite direction to voltmeter and it shows negative voltage!! There are two ways how to make Negative voltage.   * First and the easiest way is to use two the same DC power supplies.   How to connect...

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LM7905, LM7906, LM7908, LM7909, LM7910, LM7912, LM7915

As 78XX version, 79XX is also voltage stabilizer. But like 7805 have +5V stable the same is with 7905 just with opposite (negative) sign or -5V that's the only difference between these two voltage stabilizer. And here also the last two digit of 79XX represents negative output voltage. More detail about power consumption you can look at my previous post about LM78XX it's the same calculation. ATTENTION I know a lot of people who asked me if they...

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