1.3V Power Supply - This is a replacement power source for 1.3V mercury cells or or small batteries. It has many uses and I use this circuit in my computer to power a front panel multi adapter which has a digital rmometer.
1.5A High Efficiency Synchronous Switching Regulator Evaluation Board - evaluation board is designed to supply 3.3V at 15 mA up to 1.5A. input voltage range is 4V to 14V. Components were selected based on design procedure in LM2651 datasheet. PCB layout is critical to reduce noise and ensure.
13.8V 20A Power Supply - As is commonly the case, this supply was born of necessity. There is absolutely nothing special about the circuit, except that as shown, it is quite capable of up to 20 Amps intermittently or 10A continuous. Simply use a bigger transformer, bridge rectifier and more capacitors and output transistors to get more current. The basic circuit should be good for up to 100A or so, using a 5A TO3 regulator IC, but it can obviously be increased further (if you really do need a 500A supply!).
78xx power supply - Of all the voltage regulator ICs, the 78xx family is by far the most established. Not surprisingly! It's difficult to get performance this good with so few outside components necessary. Just like the famous LM317, the 78xx family incorporates.
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